[Federal Register Volume 61, Number 210 (Tuesday, October 29, 1996)]
[Proposed Rules]
[Pages 55842-55869]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-27307]



[[Page 55841]]


_______________________________________________________________________

Part II





Environmental Protection Agency





_______________________________________________________________________



40 CFR Part 63



Aerospace Manufacturing and Rework Facilities; National Emissions 
Standards; Proposed Rule

  Federal Register / Vol. 61, No. 210 / Tuesday, October 29, 1996 / 
Proposed Rules  

[[Page 55842]]



ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 63

[AD-FRL-5636-1]
RIN 2060-AG65


National Emission Standards for Hazardous Air Pollutants and 
Control Techniques Guideline Document; Aerospace Manufacturing and 
Rework Facilities

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed amendments to final rule and release of draft control 
techniques guideline (CTG) document for public review.

-----------------------------------------------------------------------

SUMMARY: This action proposes several amendments to the national 
emission standards for hazardous air pollutants (NESHAP) for aerospace 
manufacturing and rework facilities promulgated in the Federal Register 
on September 1, 1995 (60 FR 45948). This action proposes corrections to 
several references in the rule; revisions and additions to definitions; 
clarification of the applicability of the cleaning operations 
standards; clarification of the applicability of the rule to space 
vehicles; addition of standards for Type I chemical milling maskants; 
revision of standards for new and existing sources using dry 
particulate filters to control emissions from topcoat and primer 
application and depainting operations; addition of a test method for 
determining the filtration efficiency of dry particulate filters; 
addition of an exemption for certain water-reducible coatings; addition 
of an essential use exemption for cleaning solvents; clarification of 
compliance dates; clarification of the applicability of new source MACT 
to spray booth standards; clarification of the requirements for new and 
existing primer and topcoat application operations; clarification of 
monitoring requirements for dry particulate filter usage; addition of 
appendix A to this subpart containing definitions for specialty 
coatings; and addition of a cross reference to requirements in the 
General Provisions in subpart A of part 63.
    In addition, today's document announces the availability of a draft 
CTG document for control of volatile organic compound (VOC) emissions 
from aerospace manufacturing and rework facilities for public review 
and comment. This document has been prepared to assist States in 
analyzing and determining reasonably available control technology 
(RACT) for stationary sources of VOC emissions located within ozone 
national ambient air quality standard nonattainment areas.

DATES: Comments. Comments on these proposed changes and on the CTG must 
be received on or before December 30, 1996.

ADDRESSES: Comments. Interested parties may submit written comments (in 
duplicate, if possible) on the proposed changes to the NESHAP to: Air 
and Radiation Docket and Information Center (6102), (LE-131), 
Attention, Docket No. A-92-20, U.S. Environmental Protection Agency, 
401 M Street, SW., Washington, DC 20460. Comments on the proposed 
changes to the NESHAP may also be submitted electronically by sending 
electronic mail (e-mail) to: [email protected]. Submit 
comments regarding the draft CTG to Mr. James Szykman, Policy Planning 
and Standards Group, Emission Standards Division (MD-13), U.S. 
Environmental Protection Agency, Research Triangle Park, NC 27711.
    Electronic comments must be submitted as an ASCII file avoiding the 
use of special characters and any form of encryption. Comments will 
also be accepted on diskette in WordPerfect 5.1 or ASCII file format. 
All comments in electronic form must be identified by the docket number 
A-92-20. No Confidential Business Information (CBI) should be submitted 
through e-mail. Electronic comments may be filed online at many Federal 
Depository Libraries.
    Docket. Docket No. A-92-20, containing the proposed regulatory 
text, proposed Method 319, and other materials related to this 
rulemaking used in developing the NESHAP, is available for public 
inspection and copying between 8:30 a.m. to noon, and from 1 and 3 
p.m., Monday through Friday, at EPA's Air and Radiation Docket and 
Information Center, Waterside Mall, Room M-1500, 401 M Street, SW., 
Washington, DC 20460; telephone (202) 260-7548. A reasonable fee may be 
charged for copying. The docket for the CTG is available for public 
inspection and copying at the Office of Air Quality Planning and 
Standards, Research Triangle Park, NC 27711.

Control Techniques Guideline

    Copies of the draft CTG may be obtained from the U.S. EPA Library 
(MD-35), Research Triangle Park, NC 27711; telephone (919) 541-2777.
    The proposed amendments, proposed Method 319, and CTG also are 
available on the Technology Transfer Network (TTN), one of EPA's 
electronic bulletin boards. The service is free, except for the cost of 
a phone call. Dial (919) 541-5742 with a modem of up 14,400 baud per 
second (BPS) If more information on the TTN is needed, call the HELP 
line at (919) 541-5384.

FOR FURTHER INFORMATION CONTACT: For information concerning the 
standards or the CTG, contact Mr. James Szykman, Policy Planning and 
Standards Group, Emission Standards Division (MD-13), U.S. 
Environmental Protection Agency, Research Triangle Park, NC 27711; 
telephone (919) 541-2452.

SUPPLEMENTARY INFORMATION:

Regulated Entities.

    Entities potentially regulated by this action are owners or 
operators of facilities that are engaged, either in part or in whole, 
in the manufacturing or rework of commercial, civil, or military 
aerospace vehicles or components and that are major sources as defined 
in Sec. 63.2. Regulated categories include:

------------------------------------------------------------------------
              Category                  Examples of regulated entities  
------------------------------------------------------------------------
Industry............................  Facilities which are major sources
                                       of hazardous air pollutants and  
                                       manufacture, rework, or repair   
                                       aircraft such as airplanes,      
                                       helicopters, missiles, rockets,  
                                       and space vehicles.              
Federal Government..................  Federal facilities which are major
                                       sources of hazardous air         
                                       pollutants and manufacture,      
                                       rework, or repair aircraft such  
                                       as airplanes, helicopters,       
                                       missiles, rockets, and space     
                                       vehicles.                        
------------------------------------------------------------------------

    This table is not intended to be exhaustive, but rather provides a 
guide for readers regarding entities that EPA is now aware could 
potentially be regulated by this action. Other types of entities not 
listed in the table could also be regulated. To determine whether your 
facility [company, business, organization, etc.] is regulated by this 
action, you should carefully examine the applicability criteria in 
Sec. 63.741 of the NESHAP for aerospace manufacturing and rework 
facilities promulgated in the Federal Register on September 1, 1995 (60 
FR 45948).
    The information presented below is organized as follows:

I. Background
II. Summary of and Rationale for Rule Changes
    A. Corrections to References
    B. Definitions
    C. Cleaning Operations
    D. Applicability to Space Vehicles
    E. Standards for Type I Maskants

[[Page 55843]]

    F. Test Method for Determining Filtration Efficiency
    G. Standards for Dry Particulate Filters
    H. Exemption for Waterborne Coatings
    I. Essential Use Exemption for Cleaning Solvents
    J. Compliance Dates
    K. Requirements for New Affected Sources (Spray Booths)
    L. Requirements for New and Existing Primer and Topcoat 
Application Operations
    M. Monitoring Requirements for Dry Particulate Filter Usage
    N. Depainting Operations
    O. Applicability of General Provisions
III. Control Techniques Guideline
IV. Administrative Requirements
    A. Docket
    B. Paperwork Reduction Act
    C. Executive Order 12866
    D. Regulatory Flexibility Act
    E. Regulatory Review
    F. Unfunded Mandates Act

I. Background

    National emission standards for hazardous air pollutants for 
aerospace manufacturing and rework facilities were proposed in the 
Federal Register on June 6, 1994 (60 FR 29216). Public comments were 
received regarding the standards and the final NESHAP was promulgated 
in the Federal Register on September 1, 1995 (60 FR 45948). This action 
proposes to amend Secs. 63.741, 63.742, 63.743, 63.744, 63.745, 63.746, 
63.747, 63.749, 63.750, 63.751, 63.752 and 63.753 of subpart GG of 40 
CFR part 63. These sections deal with applicability, definitions, 
general standards, cleaning operations, topcoat and primer application 
operations, depainting operations, chemical milling maskant application 
operations, compliance dates and determinations, test methods and 
procedures, monitoring requirements, recordkeeping requirements, and 
reporting requirements.

II. Summary of and Rationale for Proposed Rule Changes

    Table 1, Summary of Subpart GG of 40 CFR Part 63--National Emission 
Standards for Aerospace Manufacturing and Rework Facilities, was 
included as part of the preamble when the final rule was published in 
the Federal Register. Because of the many proposed corrections, 
revisions, and additions to the final rule reflected in this notice,

 Table 1.--Summary of Subpart GG of 40 CFR Part 63--National Emission Standards for Aerospace Manufacturing and 
                                                Rework Facilities                                               
----------------------------------------------------------------------------------------------------------------
               Affected source                                  Requirement                      Description    
----------------------------------------------------------------------------------------------------------------
Aerospace Facilities.........................  Applicability: General Information..........  This rule applies  
                                                                                              to facilities     
                                                                                              engaged in        
                                                                                              original equipment
                                                                                              manufacture and/or
                                                                                              rework of         
                                                                                              aerospace vehicles
                                                                                              components and    
                                                                                              assemblies and    
                                                                                              that are major    
                                                                                              sources as defined
                                                                                              in 40 CFR part 63.
                                                                                              Specific          
                                                                                              operations are    
                                                                                              covered by the    
                                                                                              rule. (63.741)    
                                               Estimated Number of Facilities..............  Over 2,800         
                                                                                              facilities are    
                                                                                              expected to be    
                                                                                              affected by the   
                                                                                              rule. Applicable  
                                                                                              SIC codes include 
                                                                                              3720, 3721, 3724, 
                                                                                              3728, 3760, 3761, 
                                                                                              3764, 3765, and   
                                                                                              4581.             
                                               Permit Requirements.........................  Major sources      
                                                                                              required to obtain
                                                                                              operating permit  
                                                                                              in State where    
                                                                                              facility is       
                                                                                              located according 
                                                                                              to procedures in  
                                                                                              40 CFR part 70 and
                                                                                              applicable State  
                                                                                              regulations.      
                                                                                              (63.741(d))       
All Affected Sources.........................  Standards...................................  1. Comply with Sec.
                                                                                               63.4 through Sec.
                                                                                               63.6 of the      
                                                                                              General Provisions
                                                                                              of 40 CFR part 63,
                                                                                              subpart A, except 
                                                                                              as provided in    
                                                                                              Table 3.a         
                                                                                              (63.743(a))       
                                                                                             2. Submit a        
                                                                                              startup, shutdown,
                                                                                              and malfunction   
                                                                                              plan, except for  
                                                                                              new sources or    
                                                                                              filter systems    
                                                                                              operated per      
                                                                                              manufacturer's    
                                                                                              instructions.     
                                                                                              (63.743(b))       
                                                                                             3. Obtain approval 
                                                                                              to use control    
                                                                                              device not listed 
                                                                                              in this subpart.  
                                                                                              (63.743(c))       
                                                                                             4. Wastes subject  
                                                                                              to RCRA are exempt
                                                                                              from the          
                                                                                              requirements of   
                                                                                              this subpart.     
                                                                                              (63.741(e))       
                                               Compliance Dates............................  As provided for in 
                                                                                              the General       
                                                                                              Provisions, within
                                                                                              3 years after the 
                                                                                              effective date for
                                                                                              existing sources  
                                                                                              and no later than 
                                                                                              the standards'    
                                                                                              effective date or 
                                                                                              upon startup, as  
                                                                                              appropriate, for  
                                                                                              new and           
                                                                                              reconstructed     
                                                                                              sources.          
                                                                                              (63.749(a))       
                                               Test Methods and Procedures.................  See individual     
                                                                                              affected sources. 
                                                                                              Also, comply with 
                                                                                              Sec.  63.7 of the 
                                                                                              General           
                                                                                              Provisions.       
                                                                                              (63.749 & 63.750) 
                                               Monitoring Requirements.....................  See individual     
                                                                                              affected sources. 
                                                                                              Also, generally   
                                                                                              same as in Sec.   
                                                                                              63.8 (f) and (g)  
                                                                                              of the General    
                                                                                              Provisions.       
                                                                                              (63.751 (e) and   
                                                                                              (f))              
                                               Recordkeeping Requirements..................  Comply with certain
                                                                                              parts of Sec.     
                                                                                              63.10 of the      
                                                                                              General           
                                                                                              Provisions.       
                                                                                              (63.752(a))       
                                               Reporting Requirements......................  1. See individual  
                                                                                              affected sources. 
                                                                                              Comply with       
                                                                                              certain parts of  
                                                                                              Sec.  63.9 and    
                                                                                              Sec.  63.10 of the
                                                                                              General           
                                                                                              Provisions, except
                                                                                              as specified in ).
                                                                                             2. Operating permit
                                                                                              application can be
                                                                                              used for initial  
                                                                                              notification.     
                                                                                              (63.753(a)(2))    
Cleaning Operations..........................  Standards...................................  Housekeeping       
                                                                                              measures specified
                                                                                              for all cleaning  
                                                                                              operations at a   
                                                                                              facility subject  
                                                                                              to this subpart,  
                                                                                              except as provided
                                                                                              in Table 4.       
                                                                                              Measures address  
                                                                                              placing cleaning  
                                                                                              solvent laden     
                                                                                              cloth or paper in 
                                                                                              closed containers,
                                                                                              storing fresh and 
                                                                                              used cleaning     
                                                                                              solvent in closed 
                                                                                              containers, and   
                                                                                              minimizing spills 
                                                                                              during handling   
                                                                                              and transfer.     
                                                                                              (63.744(a))       
                                               Test Methods and Procedures.................  See individual     
                                                                                              affected sources. 
                                               Monitoring Requirements.....................  See individual     
                                                                                              affected sources. 
                                               Recordkeeping Requirements..................  The name and vapor 
                                                                                              pressure of each  
                                                                                              cleaning solvent, 
                                                                                              and supporting    
                                                                                              documentation.    
                                                                                              (63.752(b)(1))    

[[Page 55844]]

                                                                                                                
Hand-Wipe Cleaning Operations................  Standards...................................  1. Except for spray
                                                                                              gun and flush     
                                                                                              cleaning, all HAP 
                                                                                              or VOC hand-wipe  
                                                                                              cleaning solvents 
                                                                                              must meet a       
                                                                                              composition       
                                                                                              requirement, have 
                                                                                              a vapor pressure  
                                                                                              less than or equal
                                                                                              to 45 mm Hg at 20 
                                                                                              deg.C, or meet the
                                                                                              requirements      
                                                                                              specified in an   
                                                                                              alternative       
                                                                                              compliance plan   
                                                                                              administered by   
                                                                                              the permitting    
                                                                                              authority and     
                                                                                              approved under    
                                                                                              Section 112(l) of 
                                                                                              the Clean Air Act.
                                                                                              (63.744(b))       
                                                                                             2. List of cleaning
                                                                                              operations exempt 
                                                                                              from composition  
                                                                                              and vapor pressure
                                                                                              requirements.     
                                                                                              (63.744(e))       
                                               Test Methods and Procedures.................  1. Composition     
                                                                                              determination     
                                                                                              through           
                                                                                              manufacturer's    
                                                                                              data. (63.750(a)) 
                                                                                             2. Vapor pressure  
                                                                                              determination     
                                                                                              through readily   
                                                                                              available sources 
                                                                                              if single         
                                                                                              component; ASTM E 
                                                                                              260-85 and        
                                                                                              composite vapor   
                                                                                              pressure          
                                                                                              determination     
                                                                                              procedure for     
                                                                                              multiple component
                                                                                              solvents.         
                                                                                              (63.750(b))       
                                               Monitoring Requirements.....................  None.              
                                               Recordkeeping Requirements..................  1. If complying    
                                                                                              with composition  
                                                                                              requirements,     
                                                                                              name, data/       
                                                                                              calculations, and 
                                                                                              annual volumes.   
                                                                                              (63.752(b)(2))    
                                                                                             2. If complying    
                                                                                              with vapor        
                                                                                              pressure limit,   
                                                                                              the name, vapor   
                                                                                              pressure, data/   
                                                                                              calculations/test 
                                                                                              results, and      
                                                                                              monthly volumes.  
                                                                                              (63.752(b)(3))    
                                                                                             3. For noncompliant
                                                                                              cleaning solvents 
                                                                                              used in exempt    
                                                                                              operations,       
                                                                                              monthly volumes by
                                                                                              operation, and    
                                                                                              master list of    
                                                                                              processes.        
                                                                                              (63.752(b)(4))    
                                               Reporting Requirements......................  Semiannual         
                                                                                             1. Noncompliant    
                                                                                              cleaning solvent  
                                                                                              usage.            
                                                                                              (63.753(b)(1)(i)) 
                                                                                             2. New cleaning    
                                                                                              solvents and vapor
                                                                                              pressure or       
                                                                                              composition.      
                                                                                              (63.753(b)(1)(ii))
                                                                                             3. Statement       
                                                                                              certifying        
                                                                                              everything is in  
                                                                                              compliance.       
                                                                                              (63.753(b)(1)(v)) 
Spray Gun Cleaning...........................  Standards...................................  1. Use one of four 
                                                                                              specified         
                                                                                              techniques or an  
                                                                                              equivalent.       
                                                                                              (63.744(c))       
                                                                                             2. For enclosed    
                                                                                              spray gun         
                                                                                              cleaners, repair  
                                                                                              as soon as        
                                                                                              practicable, but  
                                                                                              within 15 days.   
                                                                                              (63.744(c)(1)(ii))
                                               Test Methods and Procedures.................  None.              
                                               Monitoring Requirements.....................  Visual inspection  
                                                                                              for leaks at least
                                                                                              once per month.   
                                                                                              (63.751(a))       
                                               Recordkeeping Requirements..................  Record all leaks,  
                                                                                              including source  
                                                                                              identification and
                                                                                              dates leaks found 
                                                                                              and repaired.     
                                                                                              (63.752(b)(5))    
                                               Reporting Requirements......................  Semiannual         
                                                                                             1. Noncompliant    
                                                                                              spray gun cleaning
                                                                                              method used.      
                                                                                              (63.753(b)(1)(iii)
                                                                                              )                 
                                                                                             2. Leaks of        
                                                                                              enclosed spray gun
                                                                                              cleaners not      
                                                                                              repaired within 15
                                                                                              days of detection.
                                                                                              (63.753(b)(1)(iv))
                                                                                             3. Statement       
                                                                                              certifying        
                                                                                              everything is in  
                                                                                              compliance.       
                                                                                              (63.753(b)(1)(v)) 
Flush Cleaning...............................  Standards...................................  Operating          
                                                                                              procedures specify
                                                                                              emptying into     
                                                                                              enclosed          
                                                                                              container,        
                                                                                              collection system,
                                                                                              or equivalent.    
                                                                                              (63.744(d))       
                                               Test Methods and Procedures.................  None.              
                                               Monitoring Requirements.....................  None.              
                                               Recordkeeping Requirements..................  None.              
                                               Reporting Requirements......................  Semiannual         
                                                                                             Statement          
                                                                                              certifying        
                                                                                              everything is in  
                                                                                              compliance.       
                                                                                              (63.753(b)(1)(v)) 
Primer and Topcoat Application Operations....  Standards...................................  Minimize spills    
                                                                                              during handling   
                                                                                              and transfer.     
                                                                                              (63.745(b))       
                                                                                             Uncontrolled       
                                                                                              Primers           
                                                                                             1. Organic HAP     
                                                                                              content limit: 350
                                                                                              g/l (2.9 lb/gal)  
                                                                                              (less water) as   
                                                                                              applied.          
                                                                                              (63.745(c)(1))    
                                                                                             2. VOC content     
                                                                                              limit: 350 g/l    
                                                                                              (2.9 lb/gal) (less
                                                                                              water and exempt  
                                                                                              solvents) as      
                                                                                              applied.          
                                                                                              (63.745(c)(2))    
                                                                                             3. Achieve         
                                                                                              compliance        
                                                                                              through: (1) use  
                                                                                              coatings below    
                                                                                              content limits, or
                                                                                              (2) use monthly   
                                                                                              volume-weighted   
                                                                                              averaging to meet 
                                                                                              content limits.   
                                                                                              (63.745(e))       
                                                                                             Uncontrolled       
                                                                                              Topcoats          
                                                                                             4. Organic HAP     
                                                                                              content limit: 420
                                                                                              g/l (3.5 lb/      
                                                                                              gal)(less water)  
                                                                                              as applied.       
                                                                                              (63.745(c)(3))    
                                                                                             5. VOC content     
                                                                                              limit: 420 g/l    
                                                                                              (3.5 lb/gal) (less
                                                                                              water and exempt  
                                                                                              solvents).        
                                                                                              (63.745(c)(4)).   
                                                                                             6. Achieve         
                                                                                              compliance as in  
                                                                                              3. above.         
                                                                                              (63.745(e))       
                                                                                             Controlled Primers 
                                                                                              and Topcoats      
                                                                                             7. If control      
                                                                                              system is used,   
                                                                                              must be designed  
                                                                                              to capture and    
                                                                                              control all       
                                                                                              emissions from the
                                                                                              application       
                                                                                              operation and must
                                                                                              achieve an overall
                                                                                              control efficiency
                                                                                              of at least 81%.  
                                                                                              (63.745(d))       
                                                                                             All Primers and    
                                                                                              Topcoats          
                                                                                             8. Specific        
                                                                                              application       
                                                                                              techniques must be
                                                                                              used. If          
                                                                                              alternative is    
                                                                                              sought, can only  
                                                                                              be used if        
                                                                                              emissions are less
                                                                                              than or equal to  
                                                                                              HVLP or           
                                                                                              electrostatic     
                                                                                              spray application 
                                                                                              techniques.       
                                                                                              (63.745(f)(1))    
                                                                                             9. All application 
                                                                                              equipment must be 
                                                                                              operated according
                                                                                              to manufacturer's 
                                                                                              specifications,   
                                                                                              company           
                                                                                              procedures, or    
                                                                                              locally specified 
                                                                                              operating         
                                                                                              procedures.       
                                                                                              (63.745(f)(2))    

[[Page 55845]]

                                                                                                                
                                                                                             10. Exemptions from
                                                                                              No. 8 above       
                                                                                              provided for in   
                                                                                              certain           
                                                                                              situations.       
                                                                                              (63.745(f)(3))    
                                                                                             11. Operating      
                                                                                              requirements for  
                                                                                              the application of
                                                                                              primers or        
                                                                                              topcoats that     
                                                                                              contain inorganic 
                                                                                              HAP, including    
                                                                                              control with      
                                                                                              either particulate
                                                                                              filters or        
                                                                                              waterwash, and    
                                                                                              shutdown if       
                                                                                              operated outside  
                                                                                              manufacturer's    
                                                                                              specified limits. 
                                                                                              (63.745(g) (1)    
                                                                                              through (3))      
                                                                                             12. Exemptions from
                                                                                              No. 11 provided   
                                                                                              for certain       
                                                                                              application       
                                                                                              operations.       
                                                                                              (63.745(g)(4))    
                                               Performance Test Periods and Tests..........  1. For             
                                                                                              ``compliant''     
                                                                                              coatings: each 30-
                                                                                              day period. For   
                                                                                              ``averaged''      
                                                                                              coatings: each 30-
                                                                                              day period. For   
                                                                                              ``controlled''    
                                                                                              coatings,         
                                                                                              noncarbon         
                                                                                              adsorber: three 1-
                                                                                              hour runs. For    
                                                                                              ``controlled''    
                                                                                              coatings, carbon  
                                                                                              adsorber: each    
                                                                                              rolling material  
                                                                                              balance period.   
                                                                                              (63.749(d)(1))    
                                                                                             2. Initial         
                                                                                              performance test  
                                                                                              for all control   
                                                                                              devices to        
                                                                                              demonstrate       
                                                                                              compliance with   
                                                                                              overall control   
                                                                                              efficiency        
                                                                                              requirement.      
                                                                                              (63.749(e)(2))    
                                               Test Methods and Procedures.................  1. Organic HAP     
                                                                                              level             
                                                                                              determination     
                                                                                              procedures.       
                                                                                              (63.750 (c) and   
                                                                                              (d))              
                                                                                             2. VOC level       
                                                                                              determination     
                                                                                              procedures.       
                                                                                              (63.750 (e) and   
                                                                                              (f))              
                                                                                             3. Overall control 
                                                                                              efficiency of     
                                                                                              carbon adsorber   
                                                                                              system determined 
                                                                                              using provided    
                                                                                              procedures; for   
                                                                                              other control     
                                                                                              devices, determine
                                                                                              capture efficiency
                                                                                              and destruction   
                                                                                              efficiency. For   
                                                                                              capture           
                                                                                              efficiency, use   
                                                                                              Procedure T in    
                                                                                              Appendix B to 40  
                                                                                              CFR 52.741 for    
                                                                                              total enclosures  
                                                                                              and 40 CFR        
                                                                                              52.741(a)(4)(iii) 
                                                                                              procedures for all
                                                                                              other enclosures. 
                                                                                              (63.750 (g) and   
                                                                                              (h))              
                                                                                             4. For alternative 
                                                                                              application       
                                                                                              methods, first    
                                                                                              determine emission
                                                                                              levels for initial
                                                                                              30-day period or  
                                                                                              five aircraft     
                                                                                              using only HVLP or
                                                                                              electrostatic, or 
                                                                                              a time period     
                                                                                              specified by the  
                                                                                              permitting agency.
                                                                                              Then use          
                                                                                              alternative       
                                                                                              application method
                                                                                              for period of time
                                                                                              necessary to coat 
                                                                                              equivalent amount 
                                                                                              of parts with same
                                                                                              coatings.         
                                                                                              Alternative       
                                                                                              application method
                                                                                              may be used when  
                                                                                              emissions         
                                                                                              generated during  
                                                                                              the test period   
                                                                                              are less than or  
                                                                                              equal to the      
                                                                                              emissions         
                                                                                              generated during  
                                                                                              the initial 30-day
                                                                                              period or five    
                                                                                              aircraft. Dried   
                                                                                              film thickness    
                                                                                              must be within    
                                                                                              specification for 
                                                                                              initial 30-day    
                                                                                              period or five    
                                                                                              aircraft as       
                                                                                              demonstrated under
                                                                                              actual production 
                                                                                              conditions.       
                                                                                              (63.750(i))       
                                               Monitoring Requirements.....................  1. Temperature     
                                                                                              sensors with      
                                                                                              continuous        
                                                                                              recorders for     
                                                                                              incinerators, and 
                                                                                              install,          
                                                                                              calibrate,        
                                                                                              maintain, and     
                                                                                              operate           
                                                                                              temperature       
                                                                                              monitors according
                                                                                              to manufacturer's 
                                                                                              specifications.   
                                                                                              Use CEMS as an    
                                                                                              alternative.      
                                                                                              (63.751(b))       
                                                                                             2. Continuously    
                                                                                              monitor pressure  
                                                                                              drop across       
                                                                                              filter; read and  
                                                                                              record pressure   
                                                                                              drop or water flow
                                                                                              rate through      
                                                                                              waterwash once per
                                                                                              shift. (63.751(c))
                                               Recordkeeping Requirements..................  1. Name and VOC    
                                                                                              content for all   
                                                                                              primers and       
                                                                                              topcoats. If      
                                                                                              coating contains  
                                                                                              exempt solvents,  
                                                                                              calculate total   
                                                                                              HAP content.      
                                                                                              (63.752(c)(1))    
                                                                                             2. For             
                                                                                              ``compliant''     
                                                                                              coatings, organic 
                                                                                              HAP and VOC       
                                                                                              contents as       
                                                                                              applied, data/    
                                                                                              calculations or   
                                                                                              Method 24 used to 
                                                                                              determine them,   
                                                                                              and monthly usage.
                                                                                              (63.752(c)(2))    
                                                                                             3. For ``low-HAP/  
                                                                                              VOC'' primers,    
                                                                                              annual purchase   
                                                                                              records, and data/
                                                                                              calculations or   
                                                                                              Method 24 used to 
                                                                                              determine H.      
                                                                                              (63.752(c)(3))    
                                                                                             4. For ``averaged''
                                                                                              coatings, monthly 
                                                                                              values of VOC     
                                                                                              content (Ha and   
                                                                                              Ga), and data/    
                                                                                              calculations or   
                                                                                              Method 24 used to 
                                                                                              calculate Ha and  
                                                                                              Ga. (63.752(c)(4))
                                                                                             5. For             
                                                                                              ``controlled''    
                                                                                              coatings          
                                                                                              (incinerator),    
                                                                                              overall control   
                                                                                              efficiency and    
                                                                                              incinerator       
                                                                                              temperature(s).   
                                                                                              (63.752(c)(5))    
                                                                                             6. For             
                                                                                              ``controlled''    
                                                                                              coatings (carbon  
                                                                                              adsorber), overall
                                                                                              control efficiency
                                                                                              and length of     
                                                                                              rolling period and
                                                                                              all supporting    
                                                                                              data/calculations.
                                                                                              (63.752(c)(6))    
                                                                                             7. Pressure drop   
                                                                                              across filter or  
                                                                                              water flow rate   
                                                                                              through waterwash 
                                                                                              once per shift,   
                                                                                              and acceptable    
                                                                                              limits. (63.752(d)
                                                                                              (1) through (3))  
                                               Reporting Requirements......................  Semiannual         
                                                                                             1. All instances   
                                                                                              where organic HAP/
                                                                                              VOC limits were   
                                                                                              exceeded.         
                                                                                              (63.753(c)(1) (i) 
                                                                                              and (ii))         
                                                                                             2. Control device  
                                                                                              exceedances (out- 
                                                                                              of-compliance).   
                                                                                              (63.753(c)(1)     
                                                                                              (iii), (iv), and  
                                                                                              (v))              
                                                                                             3. Periods when    
                                                                                              operation not     
                                                                                              immediately shut  
                                                                                              down due to       
                                                                                              pressure drop or  
                                                                                              water flow rate   
                                                                                              being outside     
                                                                                              limits.           
                                                                                              (63.753(c)(1)(vi))
                                                                                             4. Statement       
                                                                                              certifying        
                                                                                              everything is in  
                                                                                              compliance.       
                                                                                              (63.753(c)(vii))  
                                                                                             Annual             
                                                                                             5. Number of times 
                                                                                              the pressure drop 
                                                                                              or water flow rate
                                                                                              limits were       
                                                                                              exceeded.         
                                                                                              (63.753(c)(2))    

[[Page 55846]]

                                                                                                                
Depainting Operations........................  Applicability...............................  Applies to the     
                                                                                              outer surface of  
                                                                                              aerospace         
                                                                                              vehicles. Does not
                                                                                              apply to parts or 
                                                                                              units normally    
                                                                                              removed. Fuselage,
                                                                                              wings, and        
                                                                                              stabilizers always
                                                                                              covered. Radomes, 
                                                                                              parts normally    
                                                                                              removed are       
                                                                                              exempt.           
                                                                                              (63.746(a))       
                                               Standards...................................  1. Unless exempted,
                                                                                              no organic HAP are
                                                                                              to be emitted from
                                                                                              chemical strippers
                                                                                              or softeners.     
                                                                                              (63.746(b)(1))    
                                                                                             2. Minimize        
                                                                                              inorganic HAP     
                                                                                              emissions during  
                                                                                              periods of        
                                                                                              nonchemical based 
                                                                                              equipment         
                                                                                              malfunction.      
                                                                                              (63.746(b)(2))    
                                                                                             3. Use of organic  
                                                                                              HAP material(s)   
                                                                                              for spot stripping
                                                                                              and decal removal 
                                                                                              limited to 190    
                                                                                              pounds per        
                                                                                              aircraft per year 
                                                                                              for commercial    
                                                                                              aircraft and 365  
                                                                                              pounds per        
                                                                                              aircraft per year 
                                                                                              for military      
                                                                                              aircraft.         
                                                                                              (63.746(b)(3))    
                                                                                             4. Operating       
                                                                                              requirements for  
                                                                                              depainting        
                                                                                              operations        
                                                                                              generating        
                                                                                              airborne inorganic
                                                                                              HAP, including    
                                                                                              control with      
                                                                                              particulate       
                                                                                              filters or        
                                                                                              waterwash systems.
                                                                                              Mechanical and    
                                                                                              hand sanding are  
                                                                                              exempt.           
                                                                                              (63.746(b)(4) and 
                                                                                              (b)(5))           
                                                                                             5. Nonexempt       
                                                                                              organic HAP       
                                                                                              emissions         
                                                                                              controlled at 81% 
                                                                                              efficiency for    
                                                                                              systems installed 
                                                                                              before effective  
                                                                                              date. For newer   
                                                                                              systems, control  
                                                                                              at 95%.           
                                                                                              (63.746(c))       
                                               Performance Test Periods and Tests..........  1. For             
                                                                                              demonstrating no  
                                                                                              organic HAP       
                                                                                              emissions: each 24-
                                                                                              hour period.      
                                                                                              (63.749(f)(1))    
                                                                                             2. For spot        
                                                                                              stripping and     
                                                                                              decal removal     
                                                                                              usage limits: each
                                                                                              calendar year.    
                                                                                              (63.749(f)(1))    
                                                                                             3. Initial         
                                                                                              performance test  
                                                                                              for all control   
                                                                                              devices to        
                                                                                              demonstrate       
                                                                                              compliance with   
                                                                                              overall control   
                                                                                              efficiency        
                                                                                              requirement.      
                                                                                              (63.749(f)(1),    
                                                                                              (f)(2), and       
                                                                                              (f)(3))           
                                               Test Methods and Procedures.................  1. Procedures      
                                                                                              provided for      
                                                                                              determining pounds
                                                                                              of organic HAP    
                                                                                              material(s) used  
                                                                                              for aircraft.     
                                                                                              (63.750(j))       
                                                                                             2. Overall control 
                                                                                              efficiency of     
                                                                                              carbon adsorber   
                                                                                              system determined 
                                                                                              using specified   
                                                                                              procedures; for   
                                                                                              other control     
                                                                                              devices, determine
                                                                                              capture efficiency
                                                                                              and destruction   
                                                                                              efficiency. For   
                                                                                              capture           
                                                                                              efficiency, use   
                                                                                              Procedure T in    
                                                                                              Appendix B to 40  
                                                                                              CFR 52.741 for    
                                                                                              total enclosures  
                                                                                              and 40 CFR        
                                                                                              52.741(a)(4)(iii) 
                                                                                              procedures for all
                                                                                              other enclosures. 
                                                                                              (63.750(g) and    
                                                                                              (h))              
                                               Monitoring Requirements.....................  Continuously       
                                                                                              monitor pressure  
                                                                                              drop across       
                                                                                              filter; read and  
                                                                                              record pressure   
                                                                                              drop or water flow
                                                                                              rate through      
                                                                                              waterwash once per
                                                                                              shift. (63.751(d))
                                               Recordkeeping Requirements..................  1. Name and monthly
                                                                                              usage (weight) of 
                                                                                              all organic HAP   
                                                                                              material(s) used  
                                                                                              in chemical       
                                                                                              strippers.        
                                                                                              (63.752(e)(1))    
                                                                                             2. For controlled  
                                                                                              chemical strippers
                                                                                              (carbon adsorber),
                                                                                              overall control   
                                                                                              efficiency and    
                                                                                              length of rolling 
                                                                                              period and all    
                                                                                              supporting data/  
                                                                                              calculations.     
                                                                                              (63.752(e)(2))    
                                                                                             3. For controlled  
                                                                                              chemical strippers
                                                                                              (other control    
                                                                                              devices), overall 
                                                                                              control efficiency
                                                                                              and supporting    
                                                                                              documentation.    
                                                                                              (63.752(e)(3))    
                                                                                             4. List of parts/  
                                                                                              assemblies        
                                                                                              normally removed. 
                                                                                              (63.752(e)(4))    
                                                                                             5. For nonchemical 
                                                                                              based equipment,  
                                                                                              name and type, and
                                                                                              malfunction       
                                                                                              information       
                                                                                              including dates,  
                                                                                              description, and  
                                                                                              alternative       
                                                                                              methods used.     
                                                                                              (63.752(e)(5))    
                                                                                             6. For spot        
                                                                                              stripping and     
                                                                                              decal removal,    
                                                                                              annual volume     
                                                                                              used, annual      
                                                                                              average volume per
                                                                                              aircraft, and all 
                                                                                              data/calculations 
                                                                                              used to calculate 
                                                                                              volume per        
                                                                                              aircraft.         
                                                                                              (63.752(e)(6))    
                                                                                             7. Pressure drop   
                                                                                              across filter or  
                                                                                              water flow rate   
                                                                                              through waterwash 
                                                                                              once per shift and
                                                                                              acceptable limits.
                                                                                              (63.752(e)(7))    
                                               Reporting Requirements......................  Semiannual         
                                                                                             1. 24-hour periods 
                                                                                              where organic HAP 
                                                                                              were emitted from 
                                                                                              depainting        
                                                                                              operations in     
                                                                                              violation of rule.
                                                                                              (63.753(d)(1)(i)) 
                                                                                             2. New and         
                                                                                              reformulated      
                                                                                              chemical strippers
                                                                                              and HAP contents. 
                                                                                              (63.753(d)(1)(ii),
                                                                                              (iii), and (iv))  
                                                                                             3. New non-chemical
                                                                                              based depainting  
                                                                                              techniques.       
                                                                                              (63.753(d)(1)(v)) 
                                                                                             4. Malfunction     
                                                                                              information on non-
                                                                                              chemical based    
                                                                                              techniques        
                                                                                              including dates,  
                                                                                              description, and  
                                                                                              alternative       
                                                                                              methods used.     
                                                                                              (63.753(d)(1)(vi))
                                                                                             5. Periods when    
                                                                                              operation not     
                                                                                              immediately shut  
                                                                                              down due to       
                                                                                              pressure drop or  
                                                                                              water flow rate   
                                                                                              being outside     
                                                                                              limits.           
                                                                                              (63.753(d)(1)(vii)
                                                                                              )                 
                                                                                             6. List of new/    
                                                                                              discontinued      
                                                                                              aircraft models   
                                                                                              and, for new      
                                                                                              models, list of   
                                                                                              parts normally    
                                                                                              removed for       
                                                                                              depainting.       
                                                                                              (63.753(d)(1)(viii
                                                                                              ))                
                                                                                             7. Organic HAP     
                                                                                              control device    
                                                                                              exceedances.      
                                                                                              (63.753(d)(3))    
                                                                                             8. Statement       
                                                                                              certifying        
                                                                                              everything is in  
                                                                                              compliance.       
                                                                                              (63.753(d)(1)(ix))
                                                                                             Annual             
                                                                                             9. Exceedances of  
                                                                                              average annual    
                                                                                              volume limits for 
                                                                                              spot stripping and
                                                                                              decal removal.    
                                                                                              (63.753(d)(2)(i)) 
                                                                                                                

[[Page 55847]]

                                                                                                                
                                                                                             10. Number of times
                                                                                              the pressure drop 
                                                                                              or water flow rate
                                                                                              limits were       
                                                                                              exceeded.         
                                                                                              (63.753(d)(2)(ii))
                                               Applicability...............................  Applies only to    
                                                                                              chemical milling  
                                                                                              maskant operations
                                                                                              with Type I or II 
                                                                                              chemical milling  
                                                                                              maskants.         
                                                                                              (63.747(a))       
                                               Standards...................................  Minimize spills    
                                                                                              during handling   
                                                                                              and transfer.     
                                                                                              (63.747(b))       
                                                                                             Uncontrolled       
                                                                                              Maskants          
                                                                                             1. Organic HAP     
                                                                                              emissions: 622 g/l
                                                                                              (5.2 lb/gal) (less
                                                                                              water) as applied 
                                                                                              for Type I,  160 g/l   
                                                                                              (1.3 lb/gal) (less
                                                                                              water) as applied 
                                                                                              for Type II.      
                                                                                              (63.747(c)(1))    
                                                                                             2. VOC emissions:  
                                                                                              622 g/l (5.2 lb/  
                                                                                              gal) (less water  
                                                                                              and exempt        
                                                                                              solvents) as      
                                                                                              applied for Type  
                                                                                              I,  160
                                                                                              g/l (1.3 lb/gal)  
                                                                                              (less water and   
                                                                                              exempt solvents)  
                                                                                              as applied for    
                                                                                              Type II.          
                                                                                              (63.747(c)(2))    
                                                                                             3. Achieve         
                                                                                              compliance        
                                                                                              through: (1) use  
                                                                                              maskants below    
                                                                                              content limits, or
                                                                                              (2) use monthly   
                                                                                              volume-weighted   
                                                                                              averaging to meet 
                                                                                              content limits.   
                                                                                              (63.747(e))       
                                                                                             Controlled Maskants
                                                                                             4. If control      
                                                                                              device is used,   
                                                                                              system must be    
                                                                                              designed to       
                                                                                              capture and       
                                                                                              control all       
                                                                                              emissions from    
                                                                                              maskant operation 
                                                                                              and must achieve  
                                                                                              an overall control
                                                                                              efficiency of at  
                                                                                              least 81% for     
                                                                                              systems installed 
                                                                                              before effective  
                                                                                              date. For newer   
                                                                                              systems, control  
                                                                                              at 95%.           
                                                                                              (63.747(d))       
                                               Performance Test Periods and Tests..........  1. For compliant   
                                                                                              maskants: each 30-
                                                                                              day period. For   
                                                                                              averaged maskants:
                                                                                              each 30-day       
                                                                                              period. For       
                                                                                              controlled        
                                                                                              coatings, carbon  
                                                                                              adsorber: each    
                                                                                              rolling period.   
                                                                                              For controlled    
                                                                                              coatings,         
                                                                                              noncarbon         
                                                                                              adsorber: three 1-
                                                                                              hour runs.        
                                                                                              (63.749(h)(1))    
                                                                                             2. Initial         
                                                                                              performance test  
                                                                                              required for all  
                                                                                              control devices to
                                                                                              demonstrate       
                                                                                              compliance with   
                                                                                              overall control   
                                                                                              efficiency        
                                                                                              requirement.      
                                                                                              (63.749(h)(2) and 
                                                                                              (h)(3))           
                                               Test Methods and Procedures.................  Procedures provided
                                                                                              essentially       
                                                                                              identical to those
                                                                                              for primers and   
                                                                                              topcoats for      
                                                                                              organic HAP and   
                                                                                              VOC content       
                                                                                              levels.           
                                                                                              (63.750(g), (h),  
                                                                                              and (l)-(o))      
                                               Monitoring Requirements.....................  Same as for primers
                                                                                              and topcoats if   
                                                                                              incinerators are  
                                                                                              used. (63.751(b)) 
                                               Recordkeeping Requirements..................  Same as for primers
                                                                                              and topcoats.     
                                                                                              (63.752(f))       
                                               Reporting Requirements......................  Semiannual         
                                                                                             1. Exceedances of  
                                                                                              organic HAP/VOC   
                                                                                              limits.           
                                                                                              (63.753(e)(1), (2)
                                                                                              and (7))          
                                                                                             2. Control device  
                                                                                              exceedances (out  
                                                                                              of compliance).   
                                                                                              (63.753(e)(3))    
                                                                                             3. New maskants.   
                                                                                              (63.753(e)(4))    
                                                                                             4. New control     
                                                                                              devices.          
                                                                                              (63.753(e)(5))    
                                                                                             5. Everything is in
                                                                                              compliance.       
                                                                                              (63.753(e)(6))    
Waste Handling and Storage Operations........  Standards...................................  Minimize spills    
                                                                                              during handling   
                                                                                              and transfer.     
                                                                                              (63.748)          
                                               Test Methods and Procedures.................  None.              
                                               Monitoring Requirements.....................  None.              
                                               Recordkeeping Requirements..................  None.              
                                               Reporting Requirements......................  None.              
----------------------------------------------------------------------------------------------------------------
a The EPA promulgated regulations for subpart A of 40 CFR part 63, which were published in the Federal Register 
  on March 16, 1994 at 59 FR 12408.                                                                             

    Table 1 has been revised and is included as a reference summary of 
the revised standards.

A. Corrections to References

    In the promulgated rule, there were several references to 
Sec. 63.751(b)(7), which only existed in an earlier draft of the 
standard. The EPA proposes the following revisions: 
Sec. 63.751(b)(6)(ii)(A) of the promulgated rule references 
(b)(7)(iii)(A)(3), but should reference paragraph (b)(6)(iii)(A)(2); 
Sec. 63.751(b)(6)(iii) references (b)(7)(iii)(A), and (b)(7)(iii) (B) 
or (C), but should reference paragraphs (b)(6)(iii)(A), and (b)(6)(iii) 
(B) or (C); Sec. 63.751(b)(6)(iii)(A)(2) references (b)(7)(iii)(A)(1), 
but should reference paragraph (b)(6)(iii)(A)(1); 
Sec. 63.751(b)(6)(iii)(D) references (b)(7)(iii) (B) or (C), but should 
reference paragraph (b)(6)(iii) (B) or (C).

B. Definitions

    The EPA proposes that several definitions should be added to 
Sec. 63.742 and several should be revised, based on additional 
information submitted to the Agency after promulgation of the final 
rule. The EPA proposes to clarify the definition of cleaning solvent 
because many aqueous cleaners may contain negligible amounts of HAP and 
VOC. In the promulgated rule, the definition of cleaning solvent states 
that cleaning solvents do not include ``solutions that contain no HAP 
and VOC.'' The EPA proposes revising the definition as follows:

    Cleaning solvent means a liquid material used for hand-wipe, 
spray gun, or flush cleaning. This definition does not include 
solutions that contain HAP or VOC below the de minimis levels 
specified in Sec. 63.741(f) (e.g., water or acetone).

    Based on additional information received from industry, the EPA 
proposes to change the definition of aircraft transparency. As 
promulgated, the definition is limited to the aircraft windshield. On a 
fighter aircraft, the windshield is only one component of the entire 
canopy. On a commercial aircraft, passenger windows are constructed of 
similar transparent materials as those used for the windshield. Also, 
many aircraft transparencies are not laminated, but are monolithic 
transparent materials.

[[Page 55848]]

The EPA proposes the following definition for aircraft transparency:

    Aircraft transparency means the aircraft windshield, canopy, 
passenger windows, lenses, and other components that are constructed 
of transparent materials.

    The Agency proposes to add a new definition of closed-cycle 
depainting system as follows:

    Closed-cycle depainting system means a dust free, automated 
process that removes permanent coating in small sections at a time, 
and maintains a continuous vacuum around the area(s) being depainted 
to capture emissions.

The Agency is proposing this definition and is proposing an exemption 
from the total enclosure requirements found in Sec. 63.746(b) for users 
of this emerging technology that encloses the area to be depainted and 
maintains a vacuum to capture all emissions. Captured emissions are 
then separated/filtered/treated and the resulting solid waste material 
is then appropriately disposed.
    With these proposed requirements, the Agency intends to provide 
owners or operators of affected sources with the flexibility to use 
this emerging technology for depainting operations, while not 
penalizing the owner or operator by requiring the unnecessary enclosure 
of the vehicle or component being depainted.
    The EPA proposes to change the definition of high volume low 
pressure (HVLP) spray equipment as follows:

    High volume low pressure (HVLP) spray equipment means spray 
equipment that is used to apply coating by means of a spray gun that 
operates at 10.0 psig of atomizing air pressure or less at the air 
cap.

This change eliminates the 100 psig fluid delivery pressure specified 
in the final rule, since new technology has demonstrated that this 
requirement does not have to be met in order to ensure adequate 
transfer efficiency.
    The EPA also proposes adding a definition of waterborne (water-
reducible) coating as follows:

    Waterborne (water-reducible) coating means any coating that 
contains more than 5 percent water by weight as applied in its 
volatile fraction.

    The Agency has added and used this definition to encourage the use 
of water-reducible coatings (i.e., coatings that inherently result in 
lower organic HAP and VOC emissions). See Section H for additional 
information on exemption(s) of waterborne coatings.
    The Agency also proposes adding a definition for antique aerospace 
vehicle or component so that these vehicles and components may be 
exempted from the regulation. It was never the Agency's intent to 
require compliance for rework operations associated with antique 
aerospace vehicles or components including vintage aircraft or 
historical museum collections. The Agency agrees with members of the 
general aviation community that antique aerospace vehicles or 
components (i.e., aerospace vehicles or components more than 30 years 
old) present significant compliance challenges. Among these challenges 
are the difficulties in obtaining modifications to maintenance 
specifications (required if changes in coating or depainting operations 
are to be made) from manufacturing companies that are frequently no 
longer in operation. Another factor is the historical significance of 
maintaining the original integrity of the vehicle or component. In 
exempting these vehicles and components, the Agency proposes to adopt 
the definition of antique aircraft as defined in 14 CFR part 45 and 
limit the scope of this exemption to those vehicles or components that 
are not routinely in commercial service in the capacity for which they 
were designed. The Agency's intent in limiting this exemption is to 
require compliance for aerospace vehicles or components that may meet 
the age requirement but are still in routine commercial or military 
operation. The Agency also notes that this exemption would not apply to 
an airframe that may be more than 30 years old, but has been rebuilt 
and is still in routine commercial or military service in the capacity 
for which it was originally built.
    The EPA also proposes revising the definition of specialty coating 
by adding a sentence that states, ``Individual specialty coatings are 
defined in appendix A to this subpart and in the CTG for Aerospace 
Manufacturing and Rework Operations.'' This addition will allow 
affected owners or operators to easily identify which coatings are 
considered specialty coatings and are therefore exempt from this 
standard. The CTG also contains VOC limits for the specialty coatings 
defined in appendix A; appendix B (now redesignated as appendix A to 
this subpart) was referenced in Sec. 63.743(a) of the final rule, but 
inadvertently omitted from the Federal Register publication of the 
final rule.
    In appendix A to this subpart, the EPA proposes to revise the last 
sentence of the definition of adhesive bonding primer to state, ``There 
are two categories of adhesive bonding primers: primers with a design 
cure at 250 deg.F or below, and primers with a design cure above 
250 deg.F.'' This revision is a clarification that was omitted in the 
final rule.

C. Cleaning Operations

    Under the promulgated rule, the standards for cleaning operations 
could be read to apply to all cleaning operations at a facility, not 
only to cleaning operations that involve aerospace vehicles, 
components, or coating equipment. In order to clarify the applicability 
of the standards for cleaning operations, the Agency proposes to limit 
the applicability of the final rule only to the manufacture or rework 
of aerospace vehicles or components. Other, non-aerospace activities 
are not subject to the requirements of this rule.
    However, the owner or operator of a facility is not restricted from 
voluntarily extending to other operations the use of cleaning solvents 
which comply with the requirements of these NESHAP, where it is 
determined that such use is technologically feasible. For example, it 
might simplify purchasing, recordkeeping, or employee training, if the 
same hand-wipe cleaning solvents are used for several or all operations 
at a facility.
    The EPA proposes replacing the word ``solvent'' with the defined 
term ``cleaning solvent'' for clarity and consistency in Sec. 63.744, 
paragraphs (a), (b), (c), and (e).
    The EPA also proposes a change to the cleaning rag storage 
requirement. The EPA proposes rewording the first sentence of 
Sec. 63.744(a)(1) as follows:

    Place cleaning solvent-laden cloth, paper, or any other 
absorbent applicators used for cleaning in bags or other closed 
containers upon completing their use.

The promulgated NESHAP requires that cleaning rags be stored 
immediately after use. The word ``immediately'' is being removed from 
the sentence to make the rule more consistent from a temporal 
standpoint with the storage requirements contained in the California 
SIP-approved rules that were the basis for this requirement.
    Section 63.744(a)(1) of the promulgated rule also requires subject 
facilities to ``[u]se bags and containers of such design so as to 
contain vapors of the cleaning solvent.'' It has been brought to the 
Agency's attention that a literal interpretation of this language means 
100 percent capture efficiency, and even the most effective rag storage 
containers currently in use in the industry do not guarantee 100 
percent capture of cleaning solvent vapors. The Agency did not intend 
such a literal interpretation of this requirement. The quoted language 
is intended to be implemented as a work practice standard, not as an 
absolute prohibition on emissions from rag containers. An

[[Page 55849]]

example of the type of container contemplated by this language would be 
a rigid container constructed of impermeable material and using a 
tight-fitting lid, such as a 55-gallon drum with a fitted lid. Such a 
container would satisfy this requirement even though it cannot 
guarantee 100-percent capture efficiency.
    In addition, the EPA proposes changing the requirements for flush 
cleaning to cover the situation where an operator is cleaning multiple 
items at the same station, without leaving the station. The proposed 
change to Sec. 63.744(d) is as follows: ``* * * empty the used cleaning 
solvent each time aerospace parts or assemblies, or components of a 
coating unit (with the exception of spray guns) are flush cleaned * * 
*.'' This change will better address the Agency's intent in regulating 
flush cleaning.
    Based on information from industry, the EPA proposes a modification 
to the exemption in Sec. 63.744(e)(10). This exemption was intended to 
address windshield and canopy cleaning; however, many of the older 
canopies in service are constructed of acrylic, rather than 
polycarbonate. The Agency notes that acrylic canopies have the same 
critical cleaning requirements as the polycarbonate canopies, and 
believes that they therefore fall within this exemption as follows:

    Cleaning of aircraft transparencies, polycarbonate, or glass 
substrates.

D. Applicability to Space Vehicles

    Space vehicles (i.e., vehicles designed to travel beyond the limit 
of the earth's atmosphere) are specifically exempted from the 
requirements of this rule, except for the standards for depainting 
operations. The EPA proposes removing the reference to these vehicles 
in Sec. 63.741(f) and adding an additional specific exemption in a new 
paragraph, Sec. 63.741(h), to clarify the exemption. The EPA proposes 
Sec. 63.741(h) as follows:

    Regulated activities associated with space vehicles designed to 
travel beyond the limit of the earth's atmosphere, including but not 
limited to satellites, space stations, and the Space Shuttle System 
(including orbiter, external tanks, and solid rocket boosters), are 
exempt from the requirements of this subpart, except for depainting 
operations found in Sec. 63.746.

E. Standards for Type I Maskants

    The EPA proposes to establish an emission limitation for Type I 
maskants and to include Type I maskants within the definition of 
chemical milling maskants.
    Pursuant to section 114 of the Clean Air Act (Act), information 
regarding maskants was requested from nine companies that own or 
operate aerospace manufacturing and rework facilities. Information was 
requested for all types of maskants, including total quantity used, 
formulation data, VOC and organic HAP content as received and as 
applied, substrate category and the composition of the metal alloy on 
which the maskant is applied, a listing of the type of parts or 
specific aircraft surfaces on which the maskant is used, VOC and HAP 
emissions from maskant application operations, and type(s) of controls 
(if any). The information received on Type I maskants was used to 
calculate a MACT floor. The MACT floor was determined to be the 
weighted (by usage volume) average HAP emissions from the sources, 622 
grams per liter [g/L] (5.2 pounds per gallon [lb/gal]).
    The EPA proposes revising Sec. 63.747(c) to include organic HAP and 
VOC content limits of 622 g/L (5.2 lb/gal) as the standard for 
uncontrolled Type I chemical milling maskants. The EPA proposes 
revising paragraphs (c)(1) and (2) to specify that the organic HAP and 
VOC limits of 160 g/L (1.3 lb/gal) apply only to Type II chemical 
milling maskants.
    Due to the proposed addition of a standard for Type I chemical 
milling maskants, EPA also proposes removing the definition of Type I 
maskants from the list of specialty coatings in appendix A of this 
subpart and revising the definition for chemical milling maskant in 
Sec. 63.742 of the promulgated rule to read as follows:

    Chemical milling maskant means a coating that is applied 
directly to aluminum components to protect surface areas when 
chemical milling the component with a Type I or Type II etchant. 
This does not include bonding maskants, line sealers, and critical 
use and seal coat maskants. Additionally, maskants that must be used 
on an individual part or subassembly with a combination of Type I or 
Type II etchants and any of the above types of maskants (e.g., 
bonding, line sealers, and critical use and seal coat) are also 
exempt from this subpart.

    The EPA also proposes revising the definition for chemical milling 
maskant application operations in Sec. 63.742 to ``application of 
chemical milling maskant for use with Type I or Type II chemical 
milling etchants.'' The EPA specifically requests comments on the 
development of the MACT floor for Type I chemical milling maskants 
(Docket No. A-92-20).

F. Test Method for Determining Filtration Efficiency

    The Agency is proposing a test method, test Method 319, for the 
determination of filtration efficiency for paint overspray arrestors 
(also referred to as particulate filters). The Agency is proposing that 
this method be used by filter manufacturers to certify the efficiency 
of their filters for meeting the dry particulate filter requirements 
also being proposed in today's amendments.
    The filter efficiency tables (Tables 1, 2, 3, and 4 of Sec. 63.745) 
were developed from testing conducted in November, 1995 to determine 
the fractional filtration efficiency of high efficiency two- and three-
stage, liquid- and solid-phase particulate filters, also referred to as 
paint overspray arrestors. The tests also developed a filtration 
efficiency test method for use in certifying filters to be used by 
owners or operators in complying with the aerospace NESHAP.
    The EPA specifically requests comments on the proposed test method 
for certifying the filtration efficiency for these dry particulate 
filters.

G. Standards for Dry Particulate Filters

    The Agency is proposing revised MACT requirements for the control 
of inorganic particulates from certain primer, topcoat, and depainting 
operations. Pursuant to section 114 of the Act, information regarding 
particulate filters was requested from nine companies that own or 
operate aerospace manufacturing and rework facilities. Information was 
requested for all types of particulate filters, including filter 
manufacturer, manufacturer's part number, number of stages, type of 
operation being controlled (topcoat or primer operation, dry media 
blasting operation, or other), installation date, filter construction/
structure/composition, and control efficiency (with supporting 
information).

   Table 1 of Sec.  63.745 Two-Stage Arrestor; Liquid Phase Challenge   
------------------------------------------------------------------------
 Filtration efficiency requirement,    Aerodynamic particle size range, 
                 %                                             
------------------------------------------------------------------------
>90                                  >5.7                               
>50                                  >4.1                               
>10                                  >2.2                               
------------------------------------------------------------------------


[[Page 55850]]


   Table 2 of Sec.  63.745 Two-Stage Arrestor; Liquid Phase Challenge   
------------------------------------------------------------------------
 Filtration efficiency requirement,    Aerodynamic particle size range, 
                 %                                             
------------------------------------------------------------------------
>90                                  >8.1                               
>50                                  >5.0                               
>10                                  >2.6                               
------------------------------------------------------------------------


   Table 3 of Sec.  63.745 Two-Stage Arrestor; Liquid Phase Challenge   
------------------------------------------------------------------------
 Filtration efficiency requirement,    Aerodynamic particle size range, 
                 %                                             
------------------------------------------------------------------------
>95                                  >2.0                               
>80                                  >1.0                               
>65                                  >0.42                              
------------------------------------------------------------------------


   Table 4 of Sec.  63.745 Two-Stage Arrestor; Liquid Phase Challenge   
------------------------------------------------------------------------
 Filtration efficiency requirement,    Aerodynamic particle size range, 
                 %                                             
------------------------------------------------------------------------
>95                                  >2.5                               
>85                                  >1.1                               
>75                                  >0.70                              
------------------------------------------------------------------------

    For topcoat and primer operations, information was received on 510 
booths with particulate filter controls. For dry media blasting 
(depainting) operations, information was received on 22 booths with 
particulate filter controls. Based on a review of the available data, 
the EPA proposes requiring existing sources using particulate filters 
in depainting as well as topcoat and primer operations, in which any of 
the coatings contain inorganic HAP, to meet the filtration efficiency 
established for the two-stage system that was tested. Specifically, the 
Agency proposes requiring owners or operators of existing sources to 
use particulate filters that are certified by the filter manufacturer 
to meet or exceed the efficiency data in Tables 1 and 2 of Sec. 63.745 
(developed from the two-stage filter testing).
    The Agency is also proposing that new sources meet the filtration 
efficiency data points for the three-stage system that was tested. 
Specifically, the Agency proposes requiring owners or operators of new 
sources to use particulate filters that are certified by the filter 
manufacturer to meet or exceed the efficiency data in Tables 3 and 4 of 
Sec. 63.745 (developed from the three-stage filter testing). The Agency 
believes that proposed performance based control efficiency 
requirements for particulate filters used in painting and depainting 
operations will give owners and operators greater flexibility in 
selecting their particulate filter system and will not preclude the use 
of new, high-efficiency filtration technologies or very high efficiency 
one-stage filters that may be developed in the future. The EPA 
specifically requests comments on these proposed standards for 
particulate filters used in topcoat and primer application and dry 
media blasting (depainting) operations.
    In announcing these revised MACT requirements for particulate 
emissions, the Agency realizes that there are unique circumstances 
where owners and operators who have commenced construction or 
reconstruction of a new spray booth or hangar after the proposed 
regulation and have had to comply with the requirements in the 
promulgated rule. For these situations, the Agency has provided these 
owners or operators of aerospace manufacturing or rework operations who 
have commenced construction or reconstruction of new spray booth or 
hanger for depainting operations, primer, or topcoat operations, in 
which any of the coatings contain inorganic HAP's, prior to October 29, 
1996 the flexibility to meet either the requirements of the promulgated 
regulation or the proposed amendments to the final regulation found in 
today's notice. Existing sources will be required to meet the 
requirements for depainting operations and topcoat or primer 
application operations found in the final amended rule.

H. Exemption for Waterborne Coatings

    The EPA proposes that any waterborne coating for which the 
manufacturer's supplied data demonstrate that the coating meets the 
organic HAP and VOC content limits for its coating type as specified in 
the regulation be exempt from many of the organic HAP and VOC related 
requirements of this regulation. If the manufacturer's supplied data 
indicate that the waterborne coating meets the organic HAP and VOC 
content emission limits for its coating type, as specified in 
Secs. 63.745(c) and 63.747(c), then the owner or operator would not be 
required to demonstrate compliance for these coatings using the 
procedures in Sec. 63.750(c). However, the owner or operator would 
still be required to maintain purchase records and manufacturer's 
supplied data sheets for exempt coatings. Owners or operators of 
facilities using waterborne coatings would also be required to handle 
and transfer these coatings in a manner that minimizes spills, apply 
these coatings using one or more of the specified application 
techniques, and comply with inorganic HAP emission requirements. This 
exemption would be added as Sec. 63.741(i) as follows:

    Any waterborne coating for which the manufacturer's supplied 
data demonstrate that organic HAP and VOC contents are less than or 
equal to the organic HAP and VOC content limits for its coating 
type, as specified in Secs. 63.745(c) and 63.747(c), is exempt from 
the following requirements of this subpart: Secs. 63.745(d)-(e), 
63.747(d)-(e), 63.749(d) and (h), 63.750(c)-(h) and (k)-(m), 
63.752(c) and (f), and 63.753(c) and (e). A facility shall maintain 
the manufacturer's supplied data and annual purchase records for 
each exempt waterborne coating readily available for inspection and 
review, and shall retain these data for 5 years.

Section 63.741(f) would also be modified to include Sec. 63.741(i) in 
the list of additional specific exemptions from regulatory coverage.
    The EPA is proposing this exemption for waterborne coatings based 
on settlement discussions with the two petitioners that filed for 
review of the compliance demonstration provisions for waterborne 
coatings in Sec. 63.750. The Agency is proposing this exemption to 
streamline and simplify the requirements for owners and operators of 
facilities using these coatings and to encourage the use of waterborne 
coatings which may result in lower emissions than other coating types.

I. Essential Use Exemption for Cleaning Solvents

    Under title VI of the Act and the Montreal Protocol, Essential Use 
Waivers have been granted for limited applications of ozone depleting 
compounds (ODC's). The EPA proposes that an essential use exemption be 
added to this rule for cleaning operations that have been identified in 
an Essential Use Waiver. The exemption would be added as 
Sec. 63.744(e)(13) as follows:

    Cleaning operations identified in an Essential Use Waiver which 
has been reviewed and approved by the U. S. EPA and the voting 
parties of the International Montreal Protocol Committee [sections 
604(d)(1) and (g)(2) of the Act].

The EPA requests comments on this proposed essential use exemption.

J. Compliance Dates

    The EPA wishes to clarify an inconsistency between the preamble to 
the final rule and the regulation. The preamble to the final aerospace 
NESHAP states, ``Owners or operators of new commercial, civil, or 
military

[[Page 55851]]

aerospace OEM and rework operations with initial startup after 
September 1, 1998 will be required to comply with all requirements upon 
startup.'' This statement is incorrect. The text of the promulgated 
regulation correctly states that new sources, with initial startup on 
or after September 1, 1995, must comply with all requirements upon 
startup. The EPA also proposes to clarify that the deadline for 
approval of an alternate control device is 120 days prior to the 
compliance date. This clarification, mistakenly omitted from the 
published final rule, would be reflected in Sec. 63.743(c).

K. Requirements for New Affected Sources (Spray Booths)

    The Agency wishes to clarify the requirements for new affected 
sources. An affected source is an emission unit, process, or operation 
identified in the NESHAP that is part of the entire facility, but is 
not necessarily a major source. In today's proposal the Agency is 
clarifying its intent that a spray booth or hangar that contains a 
primer or topcoat application operation subject to Sec. 63.745(g) or a 
depainting operation subject to Sec. 63.746(b)(4) is considered an 
affected source and has added this description under Sec. 63.741(c). If 
such an affected source is constructed or reconstructed after October 
29, 1996 then that spray booth or hangar must comply with the 
applicable inorganic control requirements. Construction or 
reconstruction of a new spray booth or hangar at a facility for an 
existing coating or depainting operation will not cause the existing 
operation to be subject to any other new source standards; only the new 
spray booth or hangar will be subject to the applicable new source 
requirements for inorganic HAP and will need to comply upon the 
effective date of the requirements or startup, whichever is later. The 
EPA also proposes making this clarification in the final rule in 
Sec. 63.749(a).
    In addition, EPA wishes to clarify that Secs. 63.5(b)(3) and (4) of 
the General Provisions, which require advance notice and approval by 
the Agency prior to construction or reconstruction of a major affected 
source, shall apply to the construction or reconstruction of a new 
spray booth or hangar at a facility for an existing coating or 
depainting operation only if the booth or hangar will constitute a 
major source of inorganic HAP's. Owners or operators of an existing 
coating or depainting operation who construct or reconstruct a new 
booth or hangar which is not a major source of inorganic HAP's will 
only be required to submit an annual notification on or before March 1 
of each year. This annual notification shall include all of the 
information required in Sec. 63.4(b)(4) for each such booth or hangar 
constructed or reconstructed in the prior calendar year, except that 
the information shall be limited to the inorganic HAP's from the new 
booth or hangar. Of course, any owner or operator that constructs or 
reconstructs a new spray booth or hangar at a facility at which there 
is no existing coating or depainting operation will be required to 
comply with all of the applicable notice and advance approval 
requirements of Sec. 63.5.

L. Requirements for New and Existing Primer and Topcoat Application 
Operations

    Since promulgation, the Agency has received reports of confusion in 
interpreting the applicability of primer and topcoat application 
requirements to an industry that utilizes a plasma spray operation to 
apply metallic coatings to a metallic substrate. In today's preamble, 
the Agency notes that such a plasma spray operation is not subject to 
the aerospace manufacture and rework NESHAP, but would rather be 
addressed under the miscellaneous metal parts and products (surface 
coating) NESHAP that is scheduled for promulgation in 2000.
    The Agency has also provided additional flexibility to owners or 
operators of primer and topcoat application operations seeking to use 
alternative application methods. The promulgated NESHAP requires owners 
or operators to use the alternative application method in production on 
actual production parts or assemblies for a period of time sufficient 
to coat an equivalent amount of parts and assemblies with coatings 
identical to those used in an initial 30-day period. After this time 
the actual organic HAP and VOC emissions shall be calculated for this 
post-implementation period. The proposed amendments to the final NESHAP 
allow owners or operators an alternative approach whereby the proposed 
application method is tested against either HVLP or electrostatic spray 
application methods in a laboratory or pilot production area, using 
parts and coatings representative of the process(es) where the 
alternative method is to be used. Under this alternative, the 
laboratory test will use the same part configuration(s) and the same 
number of parts for both the proposed method and the HVLP or 
electrostatic spray application methods. The Agency has added this 
alternative in response to comments received from industry indicating 
that the original requirements would require actual production trials 
that could result in ineffective application equipment being used on 
actual production parts or assemblies.

M. Monitoring Requirements for Dry Particulate Filter Usage

    The Agency proposes to clarify the monitoring requirements for 
owners or operators of depainting and painting operations using dry 
particulate filters and HEPA filters to comply with this NESHAP. The 
final rule requires owners or operators to install and maintain devices 
to continuously measure the pressure drop across the system. In this 
proposal, the Agency continues to require owners or operators to 
operate a device to continuously monitor this parameter at all times. 
This requirement does not require an owner or operator to continuously 
record the pressure drop. However, the Agency is adding language to 
Sec. 63.751(c)(1) to clarify that owners or operators only are required 
to read and record these pressure drop data once per shift.

N. Depainting Operations

    Based on numerous comments on the depainting operation standard, 
the EPA proposes a clarification to Sec. 63.746. The promulgated 
standard was presented in terms of volume (gallons) of organic HAP-
containing chemical strippers per aircraft. Since the NESHAP is 
specific to HAP, the EPA proposes changing the units of the standard 
and stating the requirements in terms of weight (pounds) of organic HAP 
materials per aircraft. The proposed standard is equivalent in terms of 
actual HAP emissions to the atmosphere, but does allow greater 
flexibility to the owner or operator of a new or existing depainting 
operation in selecting materials to perform spot stripping and decal 
removal.
    The EPA proposes rewording Sec. 63.746(b)(3) as follows:

    Each owner or operator of a new or existing depainting operation 
complying with paragraph (b)(1) shall not, on an annual average 
basis, use more than 190 pounds of organic HAP material(s) per 
commercial aircraft depainted or more than 365 pounds of organic HAP 
material(s) per military aircraft depainted for spot stripping and 
decal removal.

    Similarly, the EPA also proposes revising Equation 20 in 
Sec. 63.750(j)(3) as follows:
[GRAPHIC] [TIFF OMITTED] TP29OC96.002

Where:


[[Page 55852]]


C=annual average weight (lb per aircraft) of organic HAP-material 
(chemical stripper) used for spot stripping and decal removal.
m=number of organic HAPs contained in each chemical stripper, as 
applied.
n=number of organic HAP-containing chemical strippers used in the 
annual period.
Whi=weight fraction (expressed as a decimal) of each organic HAP 
(i) contained in the chemical stripper, as applied, for each aircraft 
depainted.
Dhi=density (lbs/gal) of each organic HAP (i) contained in the 
chemical stripper, as applied, for each aircraft depainted.
Vsi=volume (gal) of organic HAP-containing chemical stripper i 
used for during the annual period.
A=number of aircraft for which depainting operations began during the 
annual period.

    As further clarification, the promulgated standard for depainting 
operations and the above proposed rewording are meant to allow 
averaging in terms of annual usages of chemical strippers. For example, 
if a facility depaints 10 aircraft in a given calendar year, the total 
allowable amount of organic HAP material(s) would be 1,900 pounds per 
year for commercial aircraft or 3,650 pounds per year for military 
aircraft.

O. Applicability of General Provisions

    The EPA proposes the addition of Table 1. General Provisions 
Applicability to subpart GG, in order to clarify the applicability of 
the General Provisions to this rule. Table 1 is referenced in 
Sec. 63.741 and is located at the end of the final rule text.

III. Control Techniques Guideline

    Under the Act, as amended in 1990, State implementation plans 
(SIP's) for ozone nonattainment areas must be revised to require RACT 
for control of VOC emissions from sources for which the EPA has already 
published a CTG or for which it will publish a CTG between the date the 
Amendments were enacted and the date an area achieves attainment status 
(the Act, 182(b)(2)). The EPA has defined RACT as ``the lowest emission 
limitation that a particular source is capable of meeting by the 
application of control technology that is reasonably available 
considering the technological and economic feasibility'' (44 FR 53761, 
September 17, 1979).
    The CTG's review current knowledge and data concerning the 
technology and costs of various emissions control techniques. The CTG's 
are intended to provide State and local air pollution authorities with 
an information base for proceeding with their own analyses of RACT to 
meet statutory requirements.
    Each CTG contains a ``presumptive norm'' for RACT for a specific 
source category, based on the EPA's evaluation of the capabilities and 
problems general to the category. Where applicable, the EPA recommends 
that States adopt requirements consistent with the presumptive norm. 
However, the presumptive norm is only a recommendation. States may 
choose to develop their own RACT requirements on a case-by-case basis, 
considering the emission reductions needed to obtain achievement of the 
national ambient air quality standards and the economic and technical 
circumstances of the individual source.
    This CTG addresses RACT for control of VOC emissions from aerospace 
manufacturing and rework facilities. Volatile organic compound 
emissions from primer, topcoat, and ``specialty'' coating application, 
maskant application, sealing, adhesives, and cleaning operations are 
addressed. Emission limits for processes also addressed in the NESHAP 
are identical to the NESHAP limits. Many of the steps in these 
operations involve the use of organic solvents and are sources of VOC 
emissions. The sources, mechanisms, and control of these VOC emissions 
are described in the CTG.
    The EPA estimates that State and local regulations developed 
pursuant to this draft CTG would affect about 2,869 facilities. Since 
the only new requirements in the CTG (requirements that are not 
included in the NESHAP) concern sealants, adhesives, and specialty 
coatings, which represent only about 3 percent of all VOC emissions 
from aerospace operations, the additional costs and emission reductions 
resulting from the CTG will be negligible. Further information on costs 
is presented in the draft CTG document and in the NESHAP for Aerospace 
Manufacturing and Rework Facilities. The EPA requests comments from the 
public on all aspects of the draft CTG.

IV. Administrative Requirements

A. Docket

    The docket is an organized and complete file of all of the 
information submitted to or otherwise considered by the EPA in the 
development of this rulemaking. The docket is a dynamic file, since 
material is added throughout the rulemaking development. The docketing 
system is intended to allow members of the public and the industries 
involved to readily identify and locate documents so that they can 
effectively participate in the rulemaking process. Along with the 
statement of basis and purpose of the proposed and promulgated 
standards and the EPA responses to significant comments, the content of 
the docket will serve as the record in case of judicial review (except 
for interagency review materials) (Sec. 307(d)(7)(A) of the Act).

B. Paperwork Reduction Act

    The information collection requirements contained in this proposed 
amendment to a final rule have been submitted to the Office of 
Management and Budget (OMB) for approval under the provisions of the 
Paperwork Reduction Act, 44 U.S.C. 3501 et seq. An Information Request 
Document has been prepared by the EPA and assigned ICR No. 1687.03. The 
collection of information required by the proposed amendments to the 
final rule has an estimated nationwide recordkeeping and reporting 
burden of 829,500 hours ($29 million). This represents a 6 percent 
reduction in the burden estimated for the final rule.
    Send comments regarding any aspect of this collection of 
information to Director, Regulatory Information Division, U. S. 
Environmental Protection Agency (2136), 401 M Street, SW, Washington, 
DC 20460; and to the Office of Information and Regulatory Affairs, 
Office of Management and Budget, Washington, DC 20503, marked 
``Attention: Desk Officer for EPA.''

C. Executive Order 12866

    Under Executive Order (E.O.) 12866 (58 FR 51735 [October 4, 1993]), 
the EPA is required to determine whether a regulation is 
``significant'' and therefore subject to OMB review and the 
requirements of this E.O. to prepare a regulatory impact analysis 
(RIA). The E.O. defines ``significant regulatory action'' as one that 
is likely to result in a rule that may (1) have an annual effect on the 
economy of $100 million or more, or adversely affect in a material way 
the economy, a sector of the economy, productivity, competition, jobs, 
the environment, public health or safety, or State, local, or Tribal 
governments or communities; (2) create a serious inconsistency or 
otherwise interfere with an action taken or planned by another agency; 
(3) materially alter the budgetary impact of entitlements, grants, user 
fees, or loan programs or the rights and obligations of recipients 
thereof; or (4) raise novel legal or policy issues arising out of legal 
mandates, the President's priorities, or the principles set forth in 
the E.O.

[[Page 55853]]

    Pursuant to the terms of Executive Order 12866, it has been 
determined that this action is not a ``significant regulatory action'' 
within the meaning of the E.O.
    Under E.O. 12866, the draft CTG document for aerospace 
manufacturing and rework facilities is considered ``nonsignificant.'' 
This CTG document is not a ``rulemaking,'' rather it provides 
information to States to aid them in developing rules.

D. Regulatory Flexibility Act

    Pursuant to section 605(b) of the Regulatory Flexibility Act, 5 
U.S.C. 605(b), I certify that this rule will not have a significant 
economic impact on a substantial number of small entities. This 
proposal would make clarifying amendments to the Aerospace NESHAP, 
including definitions, applicability, and several technical 
requirements. In addition, this notice proposes a standard for Type I 
chemical milling maskants and a test method for determining filtration 
efficiency of dry particulate filters. The overall impact of these 
amendments result in a net decrease in requirements on all entities 
affected by this rule, including small entities. Therefore these 
amendments will not have a significant impact on a substantial number 
of small entities.
    Under the Regulatory Flexibility Act, an agency is not required to 
prepare a regulatory flexibility analysis for a rule that the agency 
head certifies will not have a significant economic impact on a 
substantial number of small entities. Consequently, a regulatory 
flexibility analysis is not required and has not been prepared.

E. Regulatory Review

    In accordance with sections 112(d)(6) and 112(f)(2) of the Act, 
this regulation will be reviewed within 8 years of the date of 
promulgation. This review may include an assessment of such factors as 
evaluation of the residual health risk, any overlap with other 
programs, the existence of alternative methods of control, 
enforceability, improvements in emission control technology and health 
data, and recordkeeping and reporting requirements.

F. Unfunded Mandates Act

    The economic impact analysis performed prior to the original 
proposal showed that the economic impacts from implementation of the 
proposed standards would not be ``significant'' as defined in Executive 
Order 12866 (see section III.E). No changes have been made that would 
increase the economic impacts to a level that would be considered 
significant. The Agency has prepared the following statement of impact 
to be considered in response to the requirements of the Unfunded 
Mandates Act.
    There are no Federal funds available to assist State, local, and 
tribal governments in meeting these costs. There are important benefits 
from VOC and HAP emission reductions because these compounds have 
significant, adverse impacts on human health and welfare and on the 
environment. The rule does not have any disproportionate budgetary 
effects on any particular region of the nation, any State, local, or 
tribal government, or urban, rural, or other type of community. On the 
contrary, the rule will result in only a minimal increase in the 
average product rates (less than 1 percent). Moreover, the rule will 
not have a material effect on the national economy.
    Prior to issuing the final rule on September 1, 1995, the EPA 
provided numerous opportunities (e.g., public comment period; public 
hearing; roundtable meetings with industry, trade association, and 
State and local air pollution control agency representatives; 
environmental groups; State, local, and tribal governments; and 
concerned citizens) for consultation with interested parties. While 
small governments are not significantly or uniquely affected by the 
rule, these procedures, as well as additional public conferences and 
meetings, gave small governments an opportunity to give meaningful and 
timely input and obtain information, education, and advice on 
compliance.
    The Agency considered several regulatory options in developing the 
rule. The options selected are the least costly and least burdensome 
alternatives currently available for achieving the objectives of 
section 112 of the Act. All but one of the regulatory options selected 
are based on pollution prevention measures. Finally, after careful 
consideration of the costs, the environmental impacts, and the 
comments, the Agency decided that the MACT floor was the appropriate 
level of control for this regulation.

List of Subjects in 40 CFR Part 63

    Environmental protection, Air pollution control, Hazardous 
substances.

    Dated: October 8, 1996.
Carol M. Browner,
Administrator.

    For reasons set out in the preamble, part 63 of title 40, chapter 
I, of the Code of Federal Regulations is proposed to be amended as 
follows:

PART 63--[AMENDED]

    1. The authority citation for part 63 continues to read as follows:

    Authority: 42 U.S.C. 7401, et seq.

Subpart GG--[Amended]

    2. Section 63.741 is amended by revising paragraphs (b), (c) 
introductory text, and the last three sentences in paragraph (f); and 
by adding paragraphs (c)(7), (h), (i), and (j) to read as follows:


Sec. 63.741  Applicability and designation of affected sources.

* * * * *
    (b) The owner or operator of an affected source shall comply with 
the requirements of this subpart and of subpart A of this part, except 
as specified in Sec. 63.743(a) and Table 1 of this subpart.
    (c) Affected sources. The affected sources to which the provisions 
of this subpart apply are specified in paragraphs (c) (1) through (7) 
of this section. The activities subject to this subpart are limited to 
the manufacture or rework of aerospace vehicles or components as 
defined in this subpart. Where a dispute arises relating to the 
applicability of this subpart to a specific activity, the owner or 
operator shall demonstrate whether or not the activity is regulated 
under this subpart.
* * * * *
    (7) Each spray booth or hangar that contains a primer or topcoat 
application operation subject to Sec. 63.745(g) or a depainting 
operation subject to Sec. 63.746(b)(4).
* * * * *
    (f) * * * These requirements also do not apply to parts and 
assemblies not critical to the vehicle's structural integrity or flight 
performance. The requirements of this subpart also do not apply to 
primers, topcoats, chemical milling maskants, strippers, and cleaning 
solvents containing HAP and VOC at a concentration less than 0.1 
percent for carcinogens or 1.0 percent for noncarcinogens, as 
determined from manufacturer's representations. Additional specific 
exemptions from regulatory coverage are set forth in paragraphs (e), 
(g), (h), (i), and (j) of this section, and Secs. 63.744(a)(1), (b), 
(e), 63.745(a), (f)(3), (g)(4), 63.746(a), (b)(5), 63.747(c)(3), and 
63.749(d).
* * * * *
    (h) Regulated activities associated with space vehicles designed to 
travel beyond the limit of the earth's atmosphere, including but not 
limited to satellites, space stations, and the Space Shuttle System 
(including orbiter, external tanks, and solid rocket

[[Page 55854]]

boosters), are exempt from the requirements of this subpart, except for 
depainting operations found in Sec. 63.746.
    (i) Any waterborne coating for which the manufacturer's supplied 
data demonstrate that organic HAP and VOC contents are less than or 
equal to the organic HAP and VOC content limits for its coating type, 
as specified in Secs. 63.745(c) and 63.747(c), is exempt from the 
following requirements of this subpart: Secs. 63.745 (d) through (e), 
63.747 (d) through (e), 63.749 (d) and (h), 63.750 (c) through (h) and 
(k) through (m), 63.752 (c) and (f), and 63.753 (c) and (e). A facility 
shall maintain the manufacturer's supplied data and annual purchase 
records for each exempt waterborne coating readily available for 
inspection and review and shall retain these data for 5 years.
    (j) This subpart does not apply to rework operations performed on 
antique aerospace vehicles or components.
    3. Section 63.742 is amended by revising the definitions for 
``aircraft transparency,'' ``chemical milling maskant,'' ``chemical 
milling maskant application operation,'' ``cleaning solvent,'' ``high 
volume low pressure (HVLP) spray equipment,'' and ``specialty 
coating''; and by adding in alphabetical order definitions for 
``antique aerospace vehicle or component,'' ``closed-cycle depainting 
system,'' and ``waterborne (water-reducible) coating'' to read as 
follows:


Sec. 63.742  Definitions.

* * * * *
    Aircraft transparency means the aircraft windshield, canopy, 
passenger windows, lenses, and other components that are constructed of 
transparent materials.
    Antique aerospace vehicle or component means an antique aircraft, 
as defined by 14 CFR part 45, or components thereof. An antique 
aerospace vehicle would not routinely be in commercial or military 
service in the capacity for which it was designed.
* * * * *
    Chemical milling maskant means a coating that is applied directly 
to aluminum components to protect surface areas when chemical milling 
the component with a Type I or Type II etchant. This does not include 
bonding maskants, line sealers, and critical use and seal coat 
maskants. Additionally, maskants that must be used on an individual 
part or subassembly with a combination of Type I or II etchants and any 
of the above types of maskants (e.g., bonding, line sealers, and 
critical use and seal coat) are also exempt from this subpart.
    Chemical milling maskant application operation means application of 
chemical milling maskant for use in Type I or Type II chemical milling 
etchants.
* * * * *
    Cleaning solvent means a liquid material used for hand-wipe, spray 
gun, or flush cleaning. This definition does not include solutions that 
contain HAP and VOC below the de minimis levels specified in 
Sec. 63.741(f) (e.g., water or acetone).
    Closed-cycle depainting system means a dust-free, automated process 
that removes permanent coating in small sections at a time and 
maintains a continuous vacuum around the area(s) being depainted to 
capture emissions.
* * * * *
    High volume low pressure (HVLP) spray equipment means spray 
equipment that is used to apply coating by means of a spray gun that 
operates at 10.0 psig of atomizing air pressure or less at the air cap.
* * * * *
    Specialty coating means a coating that, even though it meets the 
definition of a primer, topcoat, or self-priming topcoat, has 
additional performance criteria beyond those of primers, topcoats, and 
self-priming topcoats for specific applications. These performance 
criteria may include, but are not limited to, temperature or fire 
resistance, substrate compatibility, antireflection, temporary 
protection or marking, sealing, adhesively joining substrates, or 
enhanced corrosion protection. Individual specialty coatings are 
defined in appendix A to this subpart and in the CTG for Aerospace 
Manufacturing and Rework Operations.
* * * * *
    Waterborne (water-reducible) coating means any coating that 
contains more than 5 percent water by weight as applied in its volatile 
fraction.
* * * * *
    4. Section 63.743 is amended by revising paragraphs (a) 
introductory text, (b) introductory text, and (c); and by adding 
paragraphs (a)(10) and (d) to read as follows:


Sec. 63.743  Standards: General.

    (a) Except as provided in paragraphs (a)(4) through (a)(9) of this 
section and in Table 1 of this subpart, each owner or operator of an 
affected source subject to this subpart is also subject to the 
following sections of subpart A of this part:
* * * * *
    (10) For the purposes of compliance with the requirements of 
Sec. 63.5(b)(4) of the General Provisions and this subpart, owners or 
operators of existing primer or topcoat application operations and 
depainting operations who construct or reconstruct a spray booth or 
hangar that is not a major source of inorganics shall only be required 
to notify the Administrator of such construction or reconstruction on 
an annual basis. Notification shall be submitted on or before March 1 
of each year and shall include the information required in 
Sec. 63.5(b)(4) for each such spray booth or hangar constructed or 
reconstructed during the prior calendar year, except that such 
information shall be limited to inorganic HAP's. No advance 
notification or written approval from the Administrator pursuant to 
Sec. 63.5(b)(3) shall be required for the construction or 
reconstruction of such a spray booth or hangar unless the booth or 
hangar will constitute a major-emitting source or inorganic HAP's.
    (b) Startup, shutdown, and malfunction plan. Each owner or operator 
that uses an air pollution control device or equipment to control HAP 
emissions shall prepare and operate in accordance with a startup, 
shutdown, and malfunction plan in accordance with Sec. 63.6. Dry 
particulate filter systems operated per the manufacturer's instructions 
are exempt from a startup, shutdown, and malfunction plan. A startup, 
shutdown, and malfunction plan shall be prepared for facilities using 
locally prepared operating procedures. In addition to the information 
required in Sec. 63.6, this plan shall also include the following 
provisions:
* * * * *
    (c) An owner or operator who uses an air pollution control device 
or equipment not listed in this subpart shall submit a description of 
the device or equipment, test data verifying the performance of the 
device or equipment in controlling organic HAP and/or VOC emissions, as 
appropriate, and specific operating parameters that will be monitored 
to establish compliance with the standards to the Administrator for 
approval not later than 120 days prior to the compliance date.
    (d)(1) Use any combination of primers, topcoats, or chemical 
milling maskants such that the monthly volume-weighted average organic 
HAP and VOC contents of the combination of primers, topcoats, or 
chemical milling maskants, as determined in accordance with the 
applicable procedures set forth in Sec. 63.750, complies with the 
specified content limits, unless the permitting agency specifies a 
shorter averaging period as part of an ambient ozone control program.

[[Page 55855]]

    (2) Averaging is allowed only for uncontrolled primers, topcoats, 
or chemical milling maskants.
    (3) Each averaging scheme shall be approved in advance by the 
permitting agency and adopted as part of the facility's title V permit.
    5. Section 63.744 is amended by revising paragraphs (a) 
introductory text, (b) introductory text, (a)(1), (a)(2), (c)(1)(ii), 
(c)(2), (c)(4), (e)(1), (e)(2), (e)(9), (e)(10); by adding paragraph 
(e)(13); and by redesignating Table 3 as Table 1 and revising it and 
transferring it from paragraph (a) to the end of section, as follows:


Sec. 63.744  Standards: Cleaning operations.

    (a) Housekeeping measures. Each owner or operator of a new or 
existing cleaning operation subject to this subpart shall comply with 
the requirements in this paragraph unless the cleaning solvent used is 
identified in Table 1 of this section or contains HAP and VOC below the 
de minimis levels specified in Sec. 63.741(f).
    (1) Place cleaning solvent-laden cloth, paper, or any other 
absorbent applicators used for cleaning in bags or other closed 
containers upon completing their use. Ensure that these bags and 
containers are kept closed at all times except when depositing or 
removing these materials from the container. Use bags and containers of 
such design so as to contain the vapors of the cleaning solvent. 
Cotton-tipped swabs used for very small cleaning operations are exempt 
from this requirement.
    (2) Store fresh and spent cleaning solvents, except semi-aqueous 
solvent cleaners, used in aerospace cleaning operations in closed 
containers.
* * * * *
    (b) Hand-wipe cleaning. Each owner or operator of a new or existing 
hand-wipe cleaning operation (excluding cleaning of spray gun equipment 
performed in accordance with paragraph (c)(3) of this section) subject 
to this subpart shall use cleaning solvents that meet one of the 
requirements specified in paragraphs (b)(1), (b)(2), and (b)(3) of this 
section. Cleaning solvent solutions that contain HAP or VOC below the 
de minimis levels specified in Sec. 63.741(f) are exempt from the 
requirements in paragraphs (b)(1), (b)(2), and (b)(3).
* * * * *
    (c) * * *
    (1) * * *
    (ii) If leaks are found during the monthly inspection required in 
Sec. 63.751(a), repairs shall be made as soon as practicable, but no 
later than 15 days after the leak was found. If the leak is not 
repaired by the 15th day after detection, the cleaning solvent shall be 
removed, and the enclosed cleaner shall be shut down until the leak is 
repaired or its use is permanently discontinued.
    (2) Nonatomized cleaning. Clean the spray gun by placing cleaning 
solvent in the pressure pot and forcing it through the gun with the 
atomizing cap in place. No atomizing air is to be used. Direct the 
cleaning solvent from the spray gun into a vat, drum, or other waste 
container that is closed when not in use.
* * * * *
    (4) Atomizing cleaning. Clean the spray gun by forcing the cleaning 
solvent through the gun and direct the resulting atomized spray into a 
waste container that is fitted with a device designed to capture the 
atomized cleaning solvent emissions.
* * * * *
    (e) * * *
    (1) Cleaning during the manufacture, assembly, installation, 
maintenance, or testing of components of breathing oxygen systems that 
are exposed to the breathing oxygen;
    (2) Cleaning during the manufacture, assembly, installation, 
maintenance, or testing of parts, subassemblies, or assemblies that are 
exposed to strong oxidizers or reducers (e.g., nitrogen tetroxide, 
liquid oxygen, or hydrazine);
* * * * *
    (9) Cleaning of metallic and non-metallic materials used in 
honeycomb cores during the manufacture or maintenance of these cores, 
and cleaning of the completed cores used in the manufacture of 
aerospace vehicles or components;
    (10) Cleaning of aircraft transparencies, polycarbonate, or glass 
substrates;
* * * * *
    (13) Cleaning operations identified in an Essential Use Waiver, 
which has been reviewed and approved by the U. S. EPA and the voting 
parties of the International Montreal Protocol Committee [sections 
604(d)(1) and (g)(2) of the Act].

                        Table 1.--Composition Requirements for Approved Cleaning Solvents                       
----------------------------------------------------------------------------------------------------------------
                Cleaning solvent type                                  Composition requirements                 
----------------------------------------------------------------------------------------------------------------
Aqueous.............................................  Cleaning solvents in which water is the primary ingredient
                                                       (80 percent of cleaning solvent solution as   
                                                       applied must be water). Detergents, surfactants, and     
                                                       bioenzyme mixtures and nutrients may be combined with the
                                                       water along with a variety of additives, such as organic 
                                                       solvents (e.g., high boiling point alcohols), builders,  
                                                       saponifiers, inhibitors, emulsifiers, pH buffers, and    
                                                       antifoaming agents. Aqueous solutions must have a flash  
                                                       point greater than 93 deg.C (200 deg.F) (as reported by  
                                                       the manufacturer), and the solution must be miscible with
                                                       water.                                                   
Hydrocarbon-based...................................  Cleaners that are composed of photochemically reactive    
                                                       hydrocarbons and oxygenated hydrocarbons and have a      
                                                       maximum vapor pressure of 7 mm Hg at 20 deg.C (3.75 in   
                                                       H2O at 68 deg.F). These cleaners also contain no HAP or  
                                                       ozone depleting compounds.                               
----------------------------------------------------------------------------------------------------------------

    6. Section 63.745 is amended by revising paragraph (e) introductory 
text, (g)(2)(i), (g)(2)(ii), (g)(2)(iii); removing paragraph (g)(2)(iv) 
and redesignating paragraphs (g)(2)(v) and (g)(2)(vi) as (g)(2)(iv) and 
(g)(2)(v), respectively, to read as follows:


Sec. 63.745   Standards: Primer and topcoat application operations.

* * * * *
    (e) Compliance methods. Compliance with the organic HAP and VOC 
content limits specified in paragraphs (c)(1) through (c)(4) of this 
section shall be accomplished by using the methods specified in 
paragraphs (c)(1) through (c)(4) of this section and Sec. 63.743(d) of 
this subpart either by themselves or in conjunction with one another.
* * * * *
    (g) * * *
    (2) * * *
    (i) For existing sources, the owner or operator must choose one of 
the following:
    (A) Before exhausting it to the atmosphere, pass the air stream 
through a dry particulate filter system certified by the filter 
manufacturer using the methods described in Sec. 63.750(o) to meet or 
exceed the efficiency data points in Tables 1 and 2; or

[[Page 55856]]



          Table 1.--Two-Stage Arrestor; Liquid Phase Challenge          
------------------------------------------------------------------------
                                       Aerodynamic particle size range, 
Filtration efficiency requirement, %              m            
------------------------------------------------------------------------
>90.................................                  >5.7              
>50.................................                  >4.1              
>10.................................                  >2.2              
------------------------------------------------------------------------


           Table 2.--Two-Stage Arrestor; Solid Phase Challenge          
------------------------------------------------------------------------
                                        Aerodynamic particle size rang, 
Filtration efficiency requirement, %              m            
------------------------------------------------------------------------
>90.................................                  >8.1              
>50.................................                  >5.0              
>10.................................                  >2.6              
------------------------------------------------------------------------

    (B) Before exhausting it to the atmosphere, pass the air stream 
through a waterwash system that shall remain in operation during all 
coating application operations; or
    (C) Before exhausting it to the atmosphere, pass the air stream 
through an air pollution control system that meets or exceeds the 
efficiency data points in Tables 1 and 2 and is approved by the 
permitting authority.
    (ii) For new sources, either:
    (A) Before exhausting it to the atmosphere, pass the air stream 
through a dry particulate filter system certified by the filter 
manufacturer using the methods described in Sec. 63.750(o) to meet or 
exceed the efficiency data points in Tables 3 and 4; or

         Table 3.--Three-Stage Arrestor; Liquid Phase Challenge         
------------------------------------------------------------------------
                                       Aerodynamic particle size range, 
Filtration efficiency requirement, %              m            
------------------------------------------------------------------------
>95.................................                  >2.0              
>80.................................                  >1.0              
>65.................................                 >0.42              
------------------------------------------------------------------------


          Table 4.--Three-Stage Arrestor; Solid Phase Challenge         
------------------------------------------------------------------------
                                       Aerodynamic particle size range, 
Filtration efficiency requirement, %              m            
------------------------------------------------------------------------
>95.................................                  >2.5              
>85.................................                  >1.1              
>75.................................                 >0.70              
------------------------------------------------------------------------

    (B) Before exhausting it to the atmosphere, pass the air stream 
through an air pollution control system that meets or exceeds the 
efficiency data points in Tables 3 and 4 and is approved by the 
permitting authority.
    (iii) Owners or operators of new sources that have commenced 
construction or reconstruction after September 1, 1995, but prior to 
October 29, 1996, may comply with the following requirements in lieu of 
the requirements in paragraph (g)(2)(ii) of this section:
    (A) Pass the air stream through either a two-stage dry particulate 
filter system or a waterwash system before exhausting it to the 
atmosphere.
    (B) If the primer or topcoat contains chromium or cadmium, control 
shall consist of a HEPA filter system, three-stage filter system, or 
other control system equivalent to the three stage filter system as 
approved by the permitting agency.
* * * * *
    7. Section 63.746 is amended by revising paragraphs (b)(1), (b)(3), 
(b)(4)(i), (b)(4)(ii), and the second sentence of paragraph (b)(4)(v) 
to read as follows:


Sec. 63.746   Standards: Depainting operations.

* * * * *
    (b)(1) HAP emissions--non-HAP chemical strippers and technologies. 
Except as provided in paragraph (b)(2) or (b)(3) of this section, each 
owner or operator of a new or existing aerospace depainting operation 
subject to this subpart shall emit no organic HAP from chemical 
stripping formulations and agents or chemical paint softeners.
* * * * *
    (3) Each owner or operator of a new or existing depainting 
operation complying with paragraph (b)(1) of this section shall not, on 
an annual average basis, use more than 190 pounds of organic HAP 
material(s) per commercial aircraft depainted or more than 365 pounds 
of organic HAP material(s) per military aircraft depainted for spot 
stripping and decal removal.
    (4) * * *
    (i) Perform the depainting operation in an enclosed area, unless a 
closed-cycle depainting system is used.
    (ii) (A) For existing sources, pass any air stream removed from the 
enclosed area or closed-cycle depainting system through a dry 
particulate filter system, certified by the filter manufacturer using 
the method described in Sec. 63.750(o) to meet or exceed the efficiency 
data points in Tables 1 and 2 of Sec. 63.745, through a baghouse, or 
through a waterwash system before exhausting it to the atmosphere.
    (B) For new sources pass any air stream removed from the enclosed 
area or closed-cycle depainting system through a dry particulate filter 
system certified by the filter manufacturer using the method described 
in Sec. 63.750(o) to meet or exceed the efficiency data points in 
Tables 3 and 4 of Sec. 63.745 or through a baghouse before exhausting 
it to the atmosphere.
* * * * *
    (v) * * * If the water path in the waterwash system fails the 
visual continuity/flow characteristics check or the water flow rate, as 
recorded pursuant to Sec. 63.752(e)(7), or the water flow rate, as 
recorded pursuant to Sec. 63.752(d)(2), exceeds the limit(s) specified 
by the booth manufacturer or in locally prepared operating procedures, 
or the booth manufacturer's or locally prepared maintenance procedures 
for the filter or waterwash system have not been performed as 
scheduled, shut down the operation immediately and take corrective 
action. * * *
* * * * *
    8. Section 63.747 is amended by revising paragraphs (c)(1), (c)(2) 
and (e) introductory text to read as follows:


Sec. 63.747  Standards: Chemical milling maskant application 
operations.

* * * * *
    (c) * * *
    (1) Organic HAP emissions from chemical milling maskants shall be 
limited to organic HAP content levels of 622 grams of organic HAP per 
liter (5.2 lb/gal) of Type I chemical milling maskant (less water) as 
applied, and no more than 160 grams of organic HAP per liter (1.3 lb/
gal) of Type II chemical milling maskant (less water) as applied.
    (2) VOC emissions from chemical milling maskants shall be limited 
to VOC content levels of no more than 622 grams of VOC per liter (5.2 
lb/gal) of Type I chemical milling maskant (less water and exempt 
solvents) as applied, and no more than 160 grams of VOC per liter (1.3 
lb/gal) of Type II chemical milling maskant (less water and exempt 
solvents) as applied.
* * * * *
    (e) Compliance methods. Compliance with the organic HAP and VOC 
content limits specified in paragraphs (c)(1) and (c)(2) of this 
section shall be accomplished by using the methods specified in 
paragraphs (c)(1) and (c)(2) of this section and Sec. 63.743(d) of this 
subpart either by themselves or in conjunction with one another.
* * * * *
    9. Section 63.749 is amended by revising paragraphs (a), (b), 
(f)(3)(ii)(A), and (h)(3)(i) to read as follows:


Sec. 63.749  Compliance dates and determinations.

    (a) Compliance dates. Each owner or operator of an existing 
affected source subject to this subpart shall comply with the 
requirements of this subpart by

[[Page 55857]]

September 1, 1998, except as specified in this section. Owners or 
operators of new affected sources subject to this subpart shall comply 
on the effective date or upon startup, whichever is later. In addition, 
each owner or operator shall comply with the compliance dates specified 
in Sec. 63.6(b) and Sec. 63.6(c).
Owners or operators of existing primer or topcoat application 
operations and depainting operations who construct or reconstruct a 
spray booth or hanger must comply with the new source requirements for 
inorganic HAP specified in Secs. 63.745(g)(2)(ii) and 63.746(b)(4) for 
that new spray booth or hanger upon startup.
    (b) General. Each facility subject to this subpart shall be 
considered in noncompliance if the owner or operator fails to submit a 
startup, shutdown, and malfunction plan as required by Sec. 63.743(b) 
or uses a control device other than one specified in this subpart that 
has not been approved by the Administrator, as required by 
Sec. 63.743(c).
* * * * *
    (f) * * *
    (3) * * *
    (ii) * * *
    (A) For any spot stripping and decal removal, the value of C, as 
determined using the procedures specified in Sec. 63.750(j), is less 
than or equal to 190 pounds of organic HAP material(s) per commercial 
aircraft depainted or more than 365 pounds of organic HAP material(s) 
per aircraft depainted for military aircraft calculated on a yearly 
average; and
* * * * *
    (h) * * *
    (3) * * *
    (i) For all uncontrolled chemical milling maskants, all values of 
Hi and Ha (as determined using the procedures specified in 
Sec. 63.750(k) and (l)) are less than or equal to 622 grams of organic 
HAP per liter (5.2 lb/gal) of Type I chemical milling maskant as 
applied (less water), and 160 grams of organic HAP per liter (1.3 lb/
gal) of Type II chemical milling maskant as applied (less water). All 
values of Gi and Ga (as determined using the procedures 
specified in Sec. 63.750(m) and (n)) are less than or equal to 622 
grams of organic VOC per liter (5.2 lb/gal) of Type I chemical milling 
maskant as applied (less water and exempt solvents), and 160 grams of 
VOC per liter (1.3 lb/gal) of Type II chemical milling maskant (less 
water and exempt solvents) as applied.
* * * * *
    10. Section 63.750 is amended by revising paragraphs (c)(1), 
(e)(1), Equation 7 (``Eq. 7'') in (e)(2), (g)(3)(ii), (i)(1), 
(i)(2)(ii), (i)(2)(iii), (equation 19 remains unchanged), (j) 
introductory text, (j)(1), (j)(3) and (k)(1); and by adding paragraph 
(o) to read as follows:


Sec. 63.750  Test methods and procedures.

* * * * *
    (c) * * *
    (1) For coatings that contain no exempt solvents, determine the 
total organic HAP content using manufacturer's supplied data or Method 
24 of 40 CFR part 60, appendix A, to determine the VOC content. The VOC 
content shall be used as a surrogate for total HAP content for coatings 
that contain no exempt solvent. If there is a discrepancy between the 
manufacturer's formulation data and the results of the Method 24 
analysis, compliance shall be based on the results from the Method 24 
analysis.
* * * * *
    (e) * * *
    (1) Determine the VOC content of each formulation (less water and 
exempt solvents) as applied using manufacturer's supplied data or 
Method 24 of 40 CFR part 60, appendix A, to determine the VOC content. 
The VOC content shall be used as a surrogate for total HAP content for 
coatings that contain no exempt solvent. If there is a discrepancy 
between the manufacturer's formulation data and the results of the 
Method 24 analysis, compliance shall be based on the results from the 
Method 24 analysis.
    (2) * * *
    [GRAPHIC] [TIFF OMITTED] TP29OC96.003
    
* * * * *
    (g) * * *
    (3) * * *
    (ii) Assure that all HAP emissions from the affected HAP emission 
point(s) are segregated from gaseous emission points not affected by 
this subpart and that the emissions can be captured for measurement, as 
described in 63.750(g)(2)(ii)(A) and (B);
* * * * *
    (i)(1) Alternative application method--primers and topcoats. Each 
owner or operator seeking to use an alternative application method (as 
allowed in Sec. 63.745(f)(1)(ix)) in complying with the standards for 
primers and topcoats shall use either the procedures specified in 
paragraphs (i)(2)(i) or (i)(2)(ii) of this section to determine the 
organic HAP and VOC emission levels of the alternative application 
technique as compared to either HVLP or electrostatic spray application 
methods.
    (2) * * *
    (ii) Test the proposed application method against either HVLP or 
electrostatic spray application methods in a laboratory or pilot 
production area, using parts and coatings representative of the 
process(es) where the alternative method is to be used. The laboratory 
test will use the same part configuration(s) and the same number of 
parts for both the proposed method and the HVLP or electrostatic spray 
application methods.
    (iii) Whenever the approach in either paragraph (i)(2)(i) or 
(i)(2)(ii) is used, the owner or operator shall calculate both the 
organic HAP and VOC emission reduction using equation 19:
* * * * *
    (j) Spot stripping and decal removal. Each owner or operator 
seeking to comply with Sec. 63.746(b)(3) shall determine the weight of 
organic HAP material used per aircraft using the procedure specified in 
paragraphs (j)(1) through (j)(3) of this section.
    (1) For each chemical stripper used for spot stripping and decal 
removal, determine for each annual period the total weight of organic 
HAP material using the procedure specified in paragraph (d)(2) of this 
section.
* * * * *
    (3) Calculate the annual average weight of organic HAP material 
used for spot stripping and decal removal per aircraft using equation 
20:
[GRAPHIC] [TIFF OMITTED] TP29OC96.004

Where:

C=annual average weight (lb per aircraft) of organic HAP-material 
(chemical stripper) used for spot stripping and decal removal.
m=number of organic HAPs contained in each chemical stripper, as 
applied.
n=number of organic HAP-containing chemical strippers used in the 
annual period.
Whi=weight fraction (expressed as a decimal) of each organic HAP 
(i) contained in the chemical stripper, as applied, for each aircraft 
depainted.
Dhi=density (lbs/gal) of each organic HAP (i) contained in the 
chemical stripper, as applied, for each aircraft depainted.
Vsi=volume (gal) of organic HAP-containing chemical stripper i 
used for during the annual period.
A=number of aircraft for which depainting operations began during the 
annual period.

    (k) * * *

[[Page 55858]]

    (1) For coatings that contain no exempt solvents, determine the 
total organic HAP content using manufacturer's supplied data or Method 
24 of 40 CFR part 60, appendix A to determine the VOC content. The VOC 
content shall be used as a surrogate for total HAP content for coatings 
that contain no exempt solvent. If there is a discrepancy between the 
manufacturer's formulation data and the results of the Method 24 
analysis, compliance shall be based on the results from the Method 24 
analysis.
* * * * *
    (o) Inorganic HAP emissions--dry particulate filter certification 
requirements. Dry particulate filters used to comply with 
Sec. 63.745(g)(2) or Sec. 63.746(b)(4) must be certified by the filter 
manufacturer, using method 319 in appendix A of subpart A of this part, 
to meet or exceed the efficiency data points found in Tables 4 and 5, 
or 6 and 7 of this section for existing or new sources respectively.
    11. Section 63.751 is amended by revising the first sentence of 
paragraph (b)(6)(ii)(A), paragraph (b)(6)(iii) introductory text, and 
the first sentence of paragraph (b)(6)(iii)(A)(2), introductory text 
and paragraphs (b)(6)(iii)(D), (c)(1), (c)(2) and (d) to read as 
follows:


Sec. 63.751  Monitoring requirements.

* * * * *
    (b) * * *
    (6) * * *
    (ii) * * *
    (A) Except as allowed by paragraph (b)(6)(iii)(A)(2) of this 
section, all continuous emission monitors shall comply with performance 
specification (PS) 8 or 9 in 40 CFR part 60, appendix B, as appropriate 
depending on whether VOC or HAP concentration is being measured. * * *
* * * * *
    (iii) Owners or operators complying with Sec. 63.745(d), 
Sec. 63.746(c), or Sec. 63.747(d) through the use of a control device 
and establishing a site-specific operating parameter in accordance with 
paragraph (b)(1) shall fulfill the requirements of paragraph 
(b)(6)(iii)(A) of this section and paragraph (b)(6)(iii) (B) or (C) of 
this section, as appropriate.
* * * * *
    (A) * * *
    (2) For owners or operators using a nonregenerative carbon 
adsorber, in lieu of using continuous emission monitors as specified in 
paragraph (b)(6)(iii)(A)(1) of this section, the owner or operator may 
use a portable monitoring device to monitor total HAP or VOC 
concentration at the inlet and outlet or the outlet of the carbon 
adsorber as appropriate. * * *
* * * * *
    (D) If complying with Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d) through the use of a nonregenerative carbon adsorber, in 
lieu of the requirements of paragraph (b)(6)(iii) (B) or (C) of this 
section, the owner or operator may replace the carbon in the carbon 
adsorber system with fresh carbon at a regular predetermined time 
interval as determined in accordance with paragraph (b)(2) of this 
section.
* * * * *
    (c) * * *
    (1) Each owner or operator using a dry particulate filter system to 
meet the requirements of Sec. 63.745(g)(2) shall, while primer or 
topcoat application operations are occurring, continuously monitor the 
pressure drop across the system and read and record the pressure drop 
once per shift following the recordkeeping requirements of 
Sec. 63.752(d).
    (2) Each owner or operator using a waterwash system to meet the 
requirements of Sec. 63.745(g)(2) shall, while primer or topcoat 
application operations are occurring, continuously monitor the water 
flow rate through the system and read an record the water flow rate 
once per shift following the recordkeeping requirements of 
Sec. 63.752(d).
    (d) Particulate filters and waterwash booths--depainting 
operations. Each owner or operator using a dry particulate filter or 
waterwash system in accordance with the requirements of 
Sec. 63.746(b)(4) shall, while depainting operations are occurring, 
continuously monitor the pressure drop across the particulate filters 
or the water flow rate through the waterwash system and read and record 
the pressure drop or the water flow rate once per shift following the 
recordkeeping requirements of Sec. 63.752(e).
* * * * *
    12. Section 63.752 is amended by revising paragraphs (b)(1), (e)(6) 
and (f) introductory text; and by removing paragraph (d)(4) to read as 
follows:


Sec. 63.752  Recordkeeping requirements.

* * * * *
    (b) * * *
    (1) The name, vapor pressure, and documentation showing the organic 
HAP constituents of each cleaning solvent used for affected cleaning 
operations at the facility.
* * * * *
    (e) * * *
    (6) Spot stripping and decal removal. For spot stripping and decal 
removal, the weight of organic HAP-material used, the annual average 
weight of organic HAP-material used per aircraft, the annual number of 
aircraft stripped, and all data and calculations used.
* * * * *
    (f) Chemical milling maskant application operations. Each owner or 
operator seeking to comply with the organic HAP and VOC content limits 
for the chemical milling maskant application operation, as specified in 
Sec. 63.747(c) and (d), shall record the information specified in 
paragraphs (f)(1) through (f)(4) of this section, as appropriate.
* * * * *
    13. Section 63.753 is amended by revising paragraph (a)(1) 
introductory text to read as follows:


Sec. 63.753  Reporting requirements.

    (a)(1) Except as provided in paragraphs (a)(2) and (a)(3) of this 
section, each owner or operator subject to this subpart shall fulfill 
the requirements contained in Sec. 63.9(a) through (e) and (h) through 
(j). Notification requirements, and Sec. 63.10 (a), (b), (d), and (f), 
Recordkeeping and reporting requirements, of the General Provisions, 40 
CFR part 63, subpart A, except that the initial notification 
requirements for new or reconstructed affected sources in Sec. 63.9(b) 
(3) through (5) shall not apply, and that the initial notification for 
existing sources that the source is subject to the standard required in 
Sec. 63.9(b)(2) shall be submitted not later than September 1, 1997. In 
addition to the requirements of 63.9(h), the notification of compliance 
status shall include:
* * * * *
    14. Table 1 is added to the end of subpart GG to read as follows:

                     Table 1 to Subpart GG.--General Provisions Applicability to Subpart GG                     
----------------------------------------------------------------------------------------------------------------
              Reference                 Applies to affected sources in subpart GG             Comment           
----------------------------------------------------------------------------------------------------------------
63.1(a)(1)...........................  Yes.......................................  .............................

[[Page 55859]]

                                                                                                                
63.1(a)(2)...........................  Yes.......................................  .............................
63.1(a)(3)...........................  Yes.......................................  .............................
63.1(a)(4)...........................  Yes.......................................  .............................
63.1(a)(5)...........................  No........................................  Reserved.                    
63.1(a)(6)...........................  Yes.......................................  .............................
63.1(a)(7)...........................  Yes.......................................  .............................
63.1(a)(8)...........................  Yes.......................................  .............................
63.1(a)(9)...........................  No........................................  Reserved.                    
63.1(a)(10)..........................  Yes.......................................  .............................
63.1(a)(11)..........................  Yes.......................................  .............................
63.1(a)(12)..........................  Yes.......................................  .............................
63.1(a)(13)..........................  Yes.......................................  .............................
63.1(a)(14)..........................  Yes.......................................  .............................
63.1(b)(1)...........................  Yes.......................................  .............................
63.1(b)(2)...........................  Yes.......................................  .............................
63.1(b)(3)...........................  Yes.......................................  .............................
63.1(c)(1)...........................  Yes.......................................  .............................
63.1(c)(2)...........................  Yes.......................................  Subpart GG does not apply to 
                                                                                    area sources.               
63.1(c)(3)...........................  No........................................  Reserved.                    
63.1(c)(4)...........................  Yes.......................................  .............................
63.1(c)(5)...........................  Yes.......................................  .............................
63.1(d)..............................  No........................................  Reserved.                    
63.1(e)..............................  Yes.......................................  .............................
63.2.................................  Yes.......................................  .............................
63.3.................................  Yes.......................................  .............................
63.4(a)(1)...........................  Yes.......................................  .............................
63.4(a)(2)...........................  Yes.......................................  .............................
63.4(a)(3)...........................  Yes.......................................  .............................
63.4(a)(4)...........................  No........................................  Reserved.                    
63.4(a)(5)...........................  Yes.......................................  .............................
63.4(b)..............................  Yes.......................................  .............................
63.4(c)..............................  Yes.......................................  .............................
63.5(a)..............................  Yes.......................................  .............................
63.5(b)(1)...........................  Yes.......................................  .............................
63.5(b)(2)...........................  No........................................  Reserved.                    
63.5(b)(3)...........................  Yes.......................................  .............................
63.5(b)(4)...........................  Yes.......................................  .............................
63.5(b)(5)...........................  Yes.......................................  .............................
63.5(b)(6)...........................  Yes.......................................  .............................
63.5(c)..............................  No........................................  Reserved.                    
63.5(d)(1)(i)........................  Yes.......................................  .............................
63.5(d)(1)(ii) (A)-(H)...............  Yes.......................................  .............................
63.5(d)(1)(ii)(I)....................  No........................................  Reserved.                    
63.5(d)(1)(ii)(J)....................  Yes.......................................  .............................
63.5(d)(1)(iii)......................  Yes.......................................  .............................
63.5(d) (2)-(4)......................  Yes.......................................  .............................
63.5(e)..............................  Yes.......................................  .............................
63.5(f)..............................  Yes.......................................  .............................
63.6(a)..............................  Yes.......................................  .............................
63.6(b) (1)-(5)......................  No........................................  Sec.  63.749(a) specifies    
                                                                                    compliance dates for new    
                                                                                    sources.                    
63.6(b)(6)...........................  No........................................  Reserved.                    
63.6(b)(7)...........................  Yes.......................................  .............................
63.6(c)(1)...........................  Yes.......................................  .............................
63.6(c)(2)...........................  No........................................  The standards in subpart GG  
                                                                                    are promulgated under       
                                                                                    section 112(d) of the Act.  
63.6(c) (3)-(4)......................  No........................................  Reserved.                    
63.6(c)(5)...........................  Yes.......................................  .............................
63.6(d)..............................  No........................................  Reserved.                    
63.6(e)..............................  Yes.......................................  Sec.  63.743(b) includes     
                                                                                    additional provisions for   
                                                                                    the operation and           
                                                                                    maintenance plan.           
63.6(f)..............................  Yes.......................................  .............................
63.6(g)..............................  Yes.......................................  .............................
63.6(h)..............................  No........................................  The standards in subpart GG  
                                                                                    do not include opacity      
                                                                                    standards.                  
63.6(i) (1)-(3)......................  Yes.......................................  .............................
63.6(i)(4)(i)(A).....................  Yes.......................................  .............................
63.6(i)(4)(i)(B).....................  No........................................  Sec.  63.743(a)(4) specifies 
                                                                                    that requests for extension 
                                                                                    of compliance must be       
                                                                                    submitted no later than 120 
                                                                                    days before an affected     
                                                                                    source's compliance date.   
63.6(i)(4)(ii).......................  No........................................  The standards in subpart GG  
                                                                                    are promulgated under       
                                                                                    section 112(d) of the Act.  

[[Page 55860]]

                                                                                                                
63.6(i) (5)-(12).....................  Yes.......................................  .............................
63.6(i)(13)..........................  Yes.......................................  .............................
63.6(i)(14)..........................  Yes.......................................  .............................
63.6(i)(15)..........................  No........................................  Reserved.                    
63.6(i)(16)..........................  Yes.......................................  .............................
63.6(j)..............................  Yes.......................................  .............................
63.7(a)(1)...........................  Yes.......................................  .............................
63.7(a)(2) (i)-(vi)..................  Yes.......................................  .............................
63.7(a)(2) (vii)-(viii)..............  No........................................  Reserved.                    
63.7(a)(2)(ix).......................  Yes.......................................  .............................
63.7(a)(3)...........................  Yes.......................................  .............................
63.7(b)..............................  Yes.......................................  .............................
63.7(c)..............................  Yes.......................................  .............................
63.7(d)..............................  Yes.......................................  .............................
63.7(e)..............................  Yes.......................................  .............................
63.7(f)..............................  Yes.......................................  .............................
63.7(g)(1)...........................  Yes.......................................  .............................
63.7(g)(2)...........................  No........................................  Reserved.                    
63.7(g)(3)...........................  Yes.......................................  .............................
63.7(h)..............................  Yes.......................................  .............................
63.8(a) (1)-(2)......................  Yes.......................................  .............................
63.8(a)(3)...........................  No........................................  Reserved.                    
63.8(a)(4)...........................  Yes.......................................  .............................
63.8(b)..............................  Yes.......................................  .............................
63.8(c)..............................  Yes.......................................  .............................
63.8(d)..............................  No........................................  .............................
63.8(e) (1)-(4)......................  Yes.......................................  .............................
63.8(e)(5)(i)........................  Yes.......................................  .............................
63.8(e)(5)(ii).......................  No........................................  The standards in subpart GG  
                                                                                    do not include opacity      
                                                                                    standards.                  
63.8(f)(1)...........................  Yes.......................................  .............................
63.8(f)(2) (i)-(vii).................  Yes.......................................  .............................
63.8(f)(2)(viii).....................  No........................................  The standards in subpart GG  
                                                                                    do not include opacity      
                                                                                    standards.                  
63.8(f)(2)(ix).......................  Yes.......................................  .............................
63.8(f) (3)-(6)......................  Yes.......................................  .............................
63.8(g)..............................  Yes.......................................  .............................
63.9(a)..............................  Yes.......................................  .............................
63.9(b)(1)...........................  Yes.......................................  .............................
63.9(b)(2)...........................  Yes.......................................  Sec.  63.753(a)(1) requires  
                                                                                    submittal of the initial    
                                                                                    notification at least 1 year
                                                                                    prior to the compliance     
                                                                                    date;                       
                                                                                   Sec.  63.753(a)(2) allows a  
                                                                                    title V or part 70 permit   
                                                                                    application to be           
                                                                                    substituted for the initial 
                                                                                    notification in certain     
                                                                                    circumstances.              
63.9(b)(3)...........................  No........................................  .............................
63.9(b)(4)...........................  No........................................  .............................
63.9(b)(5)...........................  No........................................  .............................
63.9(c)..............................  Yes.......................................  .............................
63.9(d)..............................  Yes.......................................  .............................
63.9(e)..............................  Yes.......................................  .............................
63.9(f)..............................  No........................................  The standards in subpart GG  
                                                                                    do not include opacity      
                                                                                    standards.                  
63.9(g)(1)...........................  No........................................  .............................
63.9(g)(2)...........................  No........................................  The standards in subpart GG  
                                                                                    do not include opacity      
                                                                                    standards.                  
63.9(g)(3)...........................  No........................................  .............................
63.9(h) (1)-(3)......................  Yes.......................................  Sec.  63.753(a)(1) also      
                                                                                    specifies additional        
                                                                                    information to be included  
                                                                                    in the notification of      
                                                                                    compliance status.          
63.9(h)(4)...........................  No........................................  Reserved.                    
63.9(h) (5)-(6)......................  Yes.......................................  .............................
63.9(i)..............................  Yes.......................................  .............................
63.9(j)..............................  Yes.......................................  .............................
63.10(a).............................  Yes.......................................  .............................
63.10(b).............................  Yes.......................................  .............................
63.10(c)(1)..........................  No........................................  .............................
63.10(c) (2)-(4).....................  No........................................  Reserved.                    
63.10(c)(5)-(8)......................  No........................................  .............................
63.10(c)(9)..........................  No........................................  Reserved.                    
63.10(c) (10)-(13)...................  No........................................  .............................
63.10(c)(14).........................  No........................................  Sec.  63.8(d) does not apply 
                                                                                    to this subpart.            

[[Page 55861]]

                                                                                                                
63.10(c)(15).........................  No........................................  .............................
63.10(d) (1)-(2).....................  Yes.......................................  .............................
63.10(d)(3)..........................  No........................................  The standards in subpart GG  
                                                                                    do not include opacity      
                                                                                    standards.                  
63.10(d)(4)..........................  Yes.......................................  .............................
63.10(d)(5)..........................  Yes.......................................  .............................
63.(10)(e)(1)........................  No........................................  .............................
63.10(e)(2)(i).......................  No........................................  .............................
63.10(e)(2)(ii)......................  No........................................  The standards in subpart GG  
                                                                                    do not include opacity      
                                                                                    standards.                  
63.10(e)(3)..........................  No........................................  .............................
63.10(e)(4)..........................  No........................................  The standards in subpart GG  
                                                                                    do not include opacity      
                                                                                    standards.                  
63.10(f).............................  Yes.......................................  .............................
63.11................................  Yes.......................................  .............................
63.12................................  Yes.......................................  .............................
63.13................................  Yes.......................................  .............................
63.14................................  Yes.......................................  .............................
63.15................................  Yes.......................................  .............................
----------------------------------------------------------------------------------------------------------------

    15. Appendix A of subpart GG is added to read as follows:

Appendix A to Subpart GG--Specialty Coating Definitions

    Ablative coating--A coating that chars when exposed to open 
flame or extreme temperatures, as would occur during the failure of 
an engine casing or during aerodynamic heating. The ablative char 
surface serves as an insulative barrier, protecting adjacent 
components from the heat or open flame.
    Adhesion promoter--A very thin coating applied to a substrate to 
promote wetting and form a chemical bond with the subsequently 
applied material.
    Adhesive bonding primer--A primer applied in a thin film to 
aerospace components for the purpose of corrosion inhibition and 
increased adhesive bond strength by attachment. There are two 
categories of adhesive bonding primers: primers with a design cure 
at 250 deg. F or below and primers with a design cure above 250 deg. 
F.
    Aerosol coating--A hand-held, pressurized, non-refillable 
container that expels an adhesive or a coating in a finely divided 
spray when a valve on the container is depressed.
    Antichafe coating--A coating applied to areas of moving 
aerospace components that may rub during normal operations or 
installation.
    Bearing Coating--A coating applied to an antifriction bearing, a 
bearing housing, or the area adjacent to such a bearing to 
facilitate bearing functions or to protect base material from 
excessive wear.
    Bonding maskant--A temporary coating used to protect selected 
areas of aerospace parts from strong acid or alkaline solutions 
during processing for bonding.
    Chemical agent-resistant coating (CARC)--An exterior topcoat 
designed to withstand exposure to chemical warfare agents or the 
decontaminants used on these agents.
    Clear coating--A transparent coating usually applied over a 
colored opaque coating, metallic substrate, or placard to give 
improved gloss and protection to the color coat. In some cases, a 
clearcoat refers to any transparent coating without regard to 
substrate.
    Commercial exterior aerodynamic structure primer--A primer used 
on aerodynamic components and structures that protrude from the 
fuselage, such as wings and attached components, control surfaces, 
horizontal stabilizers, vertical fins, wing-to-body fairings, 
antennae, and landing gear and doors, for the purpose of extended 
corrosion protection and enhanced adhesion.
    Commercial interior adhesive--Materials used in the bonding of 
passenger cabin interior components. These components must meet the 
FAA fireworthiness requirements.
    Compatible Substrate Primer--Includes two categories: Compatible 
Epoxy Primer and Adhesive Primer. Compatible Epoxy Primer is primer 
that is compatible with the filled elastomeric coating and is epoxy 
based. The compatible substrate primer is an epoxy-polyamide primer 
used to promote adhesion of elastomeric coatings such as impact-
resistant coatings. Adhesive Primer is a coating that (1) inhibits 
corrosion and serves as a primer applied to bare metal surfaces or 
prior to adhesive application, or (2) is applied to surfaces that 
can be expected to contain fuel. Fuel tank coatings are excluded 
from this category.
    Conformal Coating--Coating applied to electrical conductors and 
circuit boards to protect them against electrical discharge, damage, 
and/or corrosion.
    Corrosion prevention system--A coating system that provides 
corrosion protection by displacing water and penetrating mating 
surfaces, forming a protective barrier between the metal surface and 
moisture. Coatings containing oils or waxes are excluded from this 
category.
    Critical use and line sealer maskant--A temporary coating, not 
covered under other maskant categories, used to protect selected 
areas of aerospace parts from strong acid or alkaline solutions such 
as those used in anodizing, plating, chemical milling and processing 
of magnesium, titanium, high-strength steel, high precision aluminum 
chemical milling of deep cuts, and aluminum chemical milling of 
complex shapes. Materials used for repairs or to bridge gaps left by 
scribing operations (i.e. line sealer) are also included in this 
category.
    Cryogenic flexible primer--A primer designed to provide 
corrosion resistance, flexibility, and adhesion of subsequent 
coating systems when exposed to loads up to and surpassing the yield 
point of the substrate at cryogenic temperatures (-275 deg. F and 
below).
    Cryoprotective coating--A coating that insulates cryogenic or 
subcooled surfaces to limit propellant boil-off, maintain structural 
integrity of metallic structures during ascent or re-entry, and 
prevent ice formation.
    Cyanoacrylate adhesive--A fast-setting, single component 
adhesive that cures at room temperature. Also known as ``super 
glue.''
    Dry Lubricative Coating--A coating consisting of lauric acid, 
cetyl alcohol, waxes, or other non-cross linked or resin-bound 
materials that act as dry lubricants.
    Electric or radiation-effect coating--A coating or coating 
system engineered to interact, through absorption or reflection, 
with specific regions of the electromagnetic energy spectrum, such 
as the ultraviolet, visible, infrared, or microwave regions. Uses 
include, but are not limited to, lightning strike protection, 
electromagnetic pulse (EMP) protection, and radar avoidance. 
Coatings that have been designated ``classified'' by the Department 
of Defense are exempt.
    Electrostatic discharge and electromagnetic interference (EMI) 
coating--A coating applied to space vehicles, missiles, aircraft 
radomes, and helicopter blades to disperse static energy or reduce 
electromagnetic interference.
    Elevated temperature skydrol resistant commercial primer--A 
primer applied

[[Page 55862]]

primarily to commercial aircraft (or commercial aircraft adapted for 
military use) that must withstand immersion in phosphate-ester (PE) 
hydraulic fluid (Skydrol 500b or equivalent) at the elevated 
temperature of 150 deg.F for 1,000 hours.
    Epoxy polyamide topcoat--A coating used where harder films are 
required or in some areas where engraving is accomplished in 
camouflage colors.
    Fire-resistant (interior) coating--For civilian aircraft, fire-
resistant interior coatings are used on passenger cabin interior 
parts that are subject to the FAA fireworthiness requirements. For 
military aircraft, fire-resistant interior coatings are used on 
parts subject to the flammability requirements of MIL-STD-1630A and 
MIL-A-87721. For space applications, these coatings are used on 
parts subject to the flammability requirements of SE-R-0006 and SSP 
30233.
    Flexible primer--A primer that meets flexibility requirements 
such as those needed for adhesive bond primed fastener heads or on 
surfaces expected to contain fuel. The flexible coating is required 
because it provides a compatible, flexible substrate over bonded 
sheet rubber and rubber-type coatings as well as a flexible bridge 
between the fasteners, skin, and skin-to-skin joints on outer 
aircraft skins. This flexible bridge allows more topcoat flexibility 
around fasteners and decreases the chance of the topcoat cracking 
around the fasteners. The result is better corrosion resistance.
    Flight test coating--A coating applied to aircraft other than 
missiles or single-use aircraft prior to flight testing to protect 
the aircraft from corrosion and to provide required marking during 
flight test evaluation.
    Fuel tank adhesive--An adhesive used to bond components exposed 
to fuel and that must be compatible with fuel tank coatings.
    Fuel tank coating--A coating applied to fuel tank components to 
inhibit corrosion and/or bacterial growth and to assure sealant 
adhesion in extreme environmental conditions.
    High temperature coating--A coating designed to withstand 
temperatures of more than 350 deg.F.
    Insulation covering--Material that is applied to foam insulation 
to protect the insulation from mechanical or environmental damage.
    Intermediate release coating--A thin coating applied beneath 
topcoats to assist in removing the topcoat in depainting operations 
and generally to allow the use of less hazardous depainting methods.
    Lacquer--A clear or pigmented coating formulated with a 
nitrocellulose or synthetic resin to dry by evaporation without a 
chemical reaction. Lacquers are resoluble in their original solvent.
    Metalized epoxy coating--A coating that contains relatively 
large quantities of metallic pigmentation for appearance and/or 
added protection.
    Mold release--A coating applied to a mold surface to prevent the 
molded piece from sticking to the mold as it is removed.
    Non-structural adhesive--An adhesive that bonds non-load bearing 
aerospace components in non-critical applications and is not covered 
in any other specialty adhesive categories.
    Optical anti-reflection coating--A coating with a low 
reflectance in the infrared and visible wavelength ranges, which is 
used for anti-reflection on or near optical and laser hardware.
    Part marking coating--Coatings or inks used to make identifying 
markings on materials, components, and/or assemblies. These markings 
may be either permanent or temporary.
    Pretreatment coating--An organic coating that contains at least 
0.5 percent acids by weight and is applied directly to metal 
surfaces to provide surface etching, corrosion resistance, adhesion, 
and ease of stripping.
    Protective oils/waxes--Any material containing oils or waxes 
that is used as a temporary coating to provide corrosion protection 
by displacing water during manufacturing, storage, and 
transportation.
    Rain erosion-resistant coating--A coating or coating system used 
to protect the leading edges of parts such as flaps, stabilizers, 
radomes, engine inlet nacelles, etc. against erosion caused by rain 
impact during flight.
    Rocket motor bonding adhesive--An adhesive used in rocket motor 
bonding applications.
    Rocket motor nozzle coating--A catalyzed epoxy coating system 
used in elevated temperature applications on rocket motor nozzles.
    Rubber-based adhesive--Quick setting contact cements that 
provide a strong, yet flexible, bond between two mating surfaces 
that may be of dissimilar materials.
    Scale inhibitor--A coating that is applied to the surface of a 
part prior to thermal processing to inhibit the formation of scale.
    Screen print ink--Inks used in screen printing processes during 
fabrication of decorative laminates and decals.
    Seal coat maskant--An overcoat applied over a maskant to improve 
abrasion and chemical resistance during production operations.
    Sealant--A material used to prevent the intrusion of water, 
fuel, air, or other liquids or solids from certain areas of 
aerospace vehicles or components. There are two categories of 
sealants: extrudable/rollable/brushable sealants and sprayable 
sealants.
    Silicone insulation material--Insulating material applied to 
exterior metal surfaces for protection from high temperatures caused 
by atmospheric friction or engine exhaust. These materials differ 
from ablative coatings in that they are not ``sacrificial.''
    Solid film lubricant--A very thin coating consisting of a binder 
system containing as its chief pigment material one or more of the 
following: molybdenum, graphite, polytetrafluoroethylene (PTFE), or 
other solids that act as a dry lubricant between faying surfaces.
    Space vehicle coating--A coating applied to vehicles, 
assemblies, and components designed to travel beyond the limit of 
the earth's atmosphere.
    Specialized function coating--Coatings that fulfill extremely 
specific engineering requirements that are limited in application 
and are characterized by low volume usage. This category excludes 
coatings covered in other Specialty Coating categories.
    Structural autoclavable adhesive--An adhesive used to bond load 
carrying aerospace components that is cured by heat and pressure in 
an autoclave.
    Structural non-autoclavable adhesive--An adhesive cured under 
ambient conditions that is used to bond load carrying aerospace 
components or for other critical functions, such as non-structural 
bonding in the proximity of engines.
    Temporary protective coating--A coating applied to provide 
scratch or corrosion protection during manufacturing, storage, or 
transportation. Two types include peelable protective coatings and 
alkaline removable coatings. These materials are not intended to 
protect against strong acid or alkaline solutions. Coatings that 
provide this type of protection from chemical processing are not 
included in this category.
    Thermal control coating--Coatings formulated with specific 
thermal conductive or radiative properties to permit temperature 
control of the substrate.
    Touch-up and Repair Coating--A coating used to cover minor 
coating imperfections appearing after the main coating operation.
    Wing coating--A corrosion-resistant topcoat that is resilient 
enough to withstand the flexing of the wings.

    16. Appendix A to Part 63 is amended by adding method 319 in 
numerical order to read as follows:

Appendix A to Part 63--Test Methods

* * * * *

Method 319: Determination of Filtration Efficiency for Paint Overspray 
Arrestors

1.0  Scope and Application

    1.1  This method applies to the determination of the initial, 
particle size dependent, filtration efficiency for paint arrestors 
over the particle diameter range from 0.3 to 10 m. The 
method applies to single and multiple stage paint arrestors or paint 
arrestor media. The method is applicable to efficiency 
determinations from 0 to 99 percent. Two test aerosols are used--one 
liquid-phase and one solid-phase. Oleic acid, a low volatility 
liquid (CAS Number 112-80-1), is used to simulate wet paint 
overspray. The solid-phase aerosol is potassium chloride salt (KCl, 
CAS Number 7447-40-7) and is used to simulate a dry overspray. The 
method is limited to determination of the initial, clean condition 
of the arrestor. Changes in efficiency (either increase or decrease) 
due to the accumulation of paint overspray on and within the 
arrestor are not evaluated.
    1.2  Efficiency is defined as 1-Penetration (e.g., 70 percent 
efficiency is equal to 0.30 penetration). Penetration is based on 
the ratio of the downstream particle concentration to the upstream 
concentration. It is often more useful, from a mathematical or 
statistical point of view, to discuss the upstream and downstream 
counts in terms of penetration rather than the derived efficiency 
value. Thus, this document uses both penetration and efficiency as 
appropriate.

[[Page 55863]]

2.0  Summary of Method

    2.1  This method applies to the determination of the fractional 
(i.e., particle size dependent) aerosol penetration of several types 
of paint arrestors. Fractional penetration is computed from aerosol 
concentrations measured upstream and downstream of an arrestor 
installed in a laboratory test rig. The aerosol concentrations 
upstream and downstream of the arrestors are measured with an 
aerosol analyzer that simultaneously counts and sizes the particles 
in the aerosol stream. The aerosol analyzer covers the particle 
diameter size range from 0.3 to 10 m in a minimum of 12 
contiguous sizing channels. Each sizing channel covers a narrow 
range of particle diameters. For example, Channel 1 may cover from 
0.3 to 0.4 m, Channel 2 from 0.4 to 0.5 m, * * * 
By taking the ratio of the downstream to upstream counts on a 
channel by channel basis, the penetration is computed for each of 
the sizing channels.
    2.2  The upstream and downstream aerosol measurements are made 
while injecting the test aerosol into the air stream upstream of the 
arrestor (ambient aerosol is removed with HEPA filters on the inlet 
of the test rig). This test aerosol spans the particle size range 
from 0.3 to 10 m and provides sufficient upstream 
concentration in each of the OPC sizing channels to allow accurate 
calculation of penetration, down to penetrations of approximately 
0.01 (i.e., 1 percent penetration; 99 percent efficiency). Results 
are presented as a graph and a data table showing the aerodynamic 
particle diameter and the corresponding fractional efficiency.

3.0  Definitions

    Aerodynamic Diameter--diameter of a unit density sphere having 
the same aerodynamic properties as the particle in question.
    Efficiency=1-Penetration.
    Optical Particle Counter (OPC)--an instrument that counts 
particles by size using light scattering. An OPC gives particle 
diameters based on size, index of refraction, and shape.
    Penetration--the fraction of the aerosol that penetrates the 
filter at a given particle diameter. Penetration equals the 
downstream concentration divided by the upstream concentration.

4.0  Interferences

    4.1  The influence of the known interferences (particle losses) 
are negated by correction of the data using blanks.

5.0  Safety

    5.1  There are no specific safety precautions for this method 
above those of good laboratory practice. This standard does not 
purport to address all of the safety problems, if any, associated 
with its use. It is the responsibility of the user of this method to 
establish appropriate safety and health practices and determine the 
applicability of regulatory limitations prior to use.

6.0  Equipment and Supplies

    6.1  Test Facility. A schematic diagram of a test duct used in 
the development of the method is shown in Figure 319-1.
    6.1.1  The test section, paint spray section, and attached 
transitions are constructed of stainless and galvanized steel. The 
upstream and downstream ducting is 20 cm diameter PVC. The upstream 
transition provides a 7 deg. angle of expansion to provide a uniform 
air flow distribution to the paint arrestors. Aerosol concentration 
is measured upstream and downstream of the test section to obtain 
the challenge and penetrating aerosol concentrations, respectively. 
Because the downstream ducting runs back under the test section, the 
challenge and penetrating aerosol taps are located physically near 
each other, thereby facilitating aerosol sampling and reducing 
sample-line length. The inlet nozzles of the upstream and downstream 
aerosol probes are designed to yield isokinetic sampling conditions.
    6.1.2  The physical dimensions of the test duct can deviate from 
those of Figure 319-1 provided that the following key elements are 
maintained: the test duct must meet the criteria specified in Table 
319-1; the inlet air is HEPA-filtered; the blower discharges into 
the test duct thereby creating a positive pressure in the duct 
relative to the surrounding room; the challenge air has a 
temperature between 60 and 80 deg.F and a relative humidity of less 
than 70 percent; the angle of the upstream transition (if used) to 
the paint arrestor must not exceed 7 deg.; the angle of the 
downstream transition (if used) from the paint arrestor must not 
exceed 30 deg.; the test duct must provide a means for mixing the 
challenge aerosol with the upstream flow (in lieu of any mixing 
device, a duct length of 30 duct diameters fulfills this 
requirement); the test duct must provide a means for mixing any 
penetrating aerosol with the downstream flow (in lieu of any mixing 
device, a duct length of 30 duct diameters fulfills this 
requirement); the test section must provide a secure and leak-free 
mounting for single and multiple stage arrestors; the test duct must 
utilize a 180 deg. bend in the downstream duct; the test duct must 
be in straight centerline alignment from the point of aerosol 
injection to the upstream end of the 180 deg. bend; the test duct 
must be in straight centerline alignment from the downstream end of 
the 180 deg. bend to the downstream aerosol sample probe; and the 
upstream and downstream aerosol sampling probes must be located 
directly opposite each other (within a tolerance of 12-inches).
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                                         Table 319-1.--QC Control Limits                                        
----------------------------------------------------------------------------------------------------------------
                                                Frequency and description                 Control limits        
----------------------------------------------------------------------------------------------------------------
OPC zero count........................  Each Test. OPC samples HEPA-filtered air  <50 counts per minute.        
OPC sizing accuracy check.............  Daily. Sample aerosolized PSL spheres...  Peak of distribution should be
                                                                                   in correct OPC channel.      
Minimum counts per channel for          Each Test...............................  Minimum total of 500 particle 
 challenge aerosol.                                                                counts per channel.          
Maximum particle concentration........  Each Test. Needed to ensure OPC is not    <20/cc based on cumulative    
                                         overloaded.                               count >0.3 m        
                                                                                   diameter.                    
Standard Deviation of Penetration.....  Computed for each test based on the CV    <0.10 for 0.3-5 m    
                                         of the upstream and downstream counts.    diameter; <0.30 for >5 m diameter.                
0% Penetration........................  Monthly.................................  <0.01                         
100% Penetration--Kcl.................  Triplicate tests performed immediately    0.3-1 >0.95; 1-3 >0.75; 3-10  
                                         before, during, or after triplicate       >0.50.                       
                                         arrestor tests.                                                        
100% Penetration--Oleic Acid..........  Triplicate tests performed immediately    0.3-1 >0.95; 1-3 >0.75; 3-10  
                                         before, during, or after triplicate       >0.50.                       
                                         arrestor tests.                                                        
----------------------------------------------------------------------------------------------------------------

    6.2  Aerosol Generator. The aerosol generator is used to produce 
a stable aerosol covering the particle size range from 0.3 to 10 
m diameter. The generator used in the development of this 
method consists of an air atomizing nozzle positioned at the top of 
a 0.30-m (12-in.) diameter, 1.3-m (51-in) tall, acrylic, 
transparent, spray tower. This tower allows larger sized particles, 
that would otherwise foul the test duct and sample lines, to fall 
out of the aerosol. It also adds drying air to ensure that the KCl 
droplets dry to solid salt particles. After generation, the aerosol 
passes through an aerosol neutralizer (Kr85 radioactive source) to 
neutralize any electrostatic charge on the aerosol (electrostatic 
charge is an unavoidable consequence of most aerosol generation 
methods). To improve the mixing of the aerosol with the air stream, 
the aerosol is injected counter to the airflow. Generators of other 
designs may be used, but they must produce a stable aerosol 
concentration over the 0.3 to 10 m diameter size range; 
provide a means of ensuring the complete drying of the KCl aerosol; 
and utilize a charge neutralizer to neutralize any electrostatic 
charge on the aerosol. The resultant challenge aerosol must meet the 
minimum count per channel and maximum concentration criteria of 
Table 319-1.
    6.3  Frame Dimensions. To secure the arrestor or arrestor media 
in the test duct, a mounting frame is necessary. The frame is used 
to seal the arrestor into the rig to prevent aerosol laden air 
bypassing the arrestor. Since arrestor media are often sold 
unmounted, the frame must provide back support for the media in 
addition to sealing into the rig. The test frame for the 20''  x  
20'' test rig has internal dimensions of 18\1/4\'' square and a 
removable wire rod back support. The wire support is used for media 
with insufficient internal support.
    6.4  Optical Particle Counter. The upstream and downstream 
aerosol concentrations are measured with a high resolution optical 
particle counter (OPC). To ensure comparability of test results, the 
OPC utilize an optical design based white-light wide-angle forward 
light scattering encompassing the angles from 15 deg. to 150 deg. 
with respect to the incident light and provide a minimum of 12 
contiguous particle sizing channels from 0.3 to 10 m 
diameter (based on response to PSL) where, for each channel, the 
ratio of the diameter corresponding to the upper channel bound to 
the lower channel bound must not exceed 1.5.
    6.5  Aerosol Sampling System. The upstream and downstream sample 
lines must be made of rigid electrically-grounded metallic tubing 
having a smooth inside surface, and they must be rigidly secured to 
prevent movement during testing. The upstream and downstream sample 
lines are to be nominally identical in geometry. The use of a short 
length (50 mm maximum) of straight flexible electrically-dissipative 
tubing to make the final connection to the OPC is acceptable. The 
inlet nozzles of the upstream and downstream probes must be sharp-
edged and of appropriate entrance diameter to maintain isokinetic 
sampling within 10 percent of the air velocity. The system must be 
designed to allow repeated sequential upstream--downstream sampling. 
Sufficient time must be allowed between each upstream to downstream 
and downstream to upstream switch to minimize cross contamination in 
the resultant OPC measurement (verified per 11.3).
    6.6  Airflow Monitor. The volumetric airflow through the system 
may be measured with a calibrated orifice flow nozzle or by use of a 
velocity probe. If a velocity probe is used, traverse measurements 
(Figure 319-2) across the duct (12-point equal area traverse for 
round ducts, 9-point equal area traverse for square ducts) must be 
performed to allow accurate determination of volumetric flow (i.e. 
average velocity  x  cross sectional area of duct). The flow orifice 
and velocity probe must have an accuracy of 5 percent or better. The 
resolution of the velocity probe must be 5 percent of reading or 
better.

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7.0 Reagents and Standards.

    7.1  The liquid test aerosol is reagent grade, 98 percent pure, 
oleic acid (Table 319-2). The solid test aerosol is KCl aerosolized 
from a solution of 20 percent KCl in water. In addition to the test 
aerosol, a calibration aerosol of monodisperse polystyrene latex 
(PSL) spheres are used to verify the calibration of the OPC.

                                              Table 319-2.--Properties of the Test and Calibration Aerosols                                             
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                        Density,  g/                                                    
                                                        Refractive index                   cm\3\                            Shape                       
--------------------------------------------------------------------------------------------------------------------------------------------------------
Oleic Acid (liquid-phase challenge        1.46 non absorbing..........................         0.89  Spherical.                                         
 aerosol).                                                                                                                                              
KCI (solid-phase challenge aerosol).....  1.49........................................         1.98  Cubic or agglomerated cubes.                       
PSL (calibration aerosol)...............  1.59 nonabsorbing...........................         1.05  Spherical.                                         
--------------------------------------------------------------------------------------------------------------------------------------------------------

8.0  Sample Collection, Preservation, and Storage

    8.1  In this test, all sampling occurs in real-time, thus no 
samples are collected that require preservation or storage during 
the test. The paint arrestors are shipped and stored to avoid 
structural damage or soiling. Each arrestor may be shipped in its 
original box from the manufacturer or similar cardboard box. 
Arrestors are stored at the test site in a location that keeps them 
clean and dry. Each arrestor is clearly labeled for tracking 
purposes.

9.0  Quality Control

    9.1  Table 319-1 lists the QC control limits.
    9.2  The standard deviation () of the penetration (P) 
for a given test at each of the 15 OPC sizing channels is computed 
from the coefficient of variation (CV, the standard deviation 
divided by the mean) of the upstream and downstream measurements as:
[GRAPHIC] [TIFF OMITTED] TP29OC96.005

For a properly operating system, the standard deviation of the 
penetration is < 0.10 at particle diameters from 0.3 to 5 m 
and less than 0.30 at diameters > 5 m.
    9.3  Data Quality Indicators. Data Quality Objectives (DQO).
    9.3.1  Fractional Penetration. From the triplicate tests of each 
paint arrestor model, the standard deviation for the penetration 
measurements at each particle size (i.e., for each sizing channel of 
the OPC) is computed as:
[GRAPHIC] [TIFF OMITTED] TP29OC96.006

Where Pi represents an individual penetration measurement, and 
P the average of the 3 (n = 3) individual measurements.
    9.3.2  Bias of the fractional penetration values is determined 
from triplicate no-filter and HEPA filter tests. These tests 
determine the measurement bias at 100 percent penetration and 0 
percent penetration, respectively.
    9.3.3  PSL-Equivalent Light Scattering Diameter. The precision 
and bias of the OPC sizing determination are based on sampling three 
known diameter sizes of PSL and noting whether the particle counts 
peak in the correct channel of the OPC. This is a pass/fail 
measurement with no calculations involved.
    9.3.4  Flow Velocity. The precision of the measurement is 5 
percent of the set point as read with the thermal anemometer. The 
maximum acceptable bias is 20 percent based on a comparison of the 
thermal anemometer to pitot tube readings.

10.0  Calibration and Standardization

    10.1  Optical Particle Counter. The OPC must have an up-to-date 
factory calibration (i.e., calibrated within prior 6 months). Check 
the OPC zero at the beginning and end of each test by sampling HEPA-
filtered air. Verify the sizing accuracy at the beginning of the 
measurement program with three sizes of PSL spheres and then on a 
daily basis (for days when tests are performed) with 1-size PSL 
spheres.
    10.2  Flow Velocity. Airflow orifice plates and velocity probes 
must have an accuracy of 5 percent or better. Manometers used in 
conjunction with the orifice plate must be inspected prior to use 
for proper level, zero, and mechanical integrity. Tubing connections 
to the manometer must be free from kinks and have secure 
connections.
    10.3  Pressure Drop. Measure pressure drop across the paint 
arrestor with an inclined manometer readable to within 0.01 in. 
H2O. Prior to use, the level and zero of the manometer, and all 
tubing connections, must be inspected and adjusted as needed.

11.0  Procedure

    11.1  Filtration Efficiency. For both the oleic acid and KCl 
challenges, this procedure is performed in triplicate using a new 
arrestor for each test.
    11.1.1  General Information and Test Duct Preparation
    11.1.1.1  Use the ``Test Run Sheet'' form (Figure 319-3) to 
record the test information.
    11.1.1.2  Record the date, time, test operator, Test #, paint 
arrestor brand/model and its assigned ID number. For tests with no 
arrestor, record none.
    11.1.1.3  Ensure that the arrestor is undamaged and is in 
``new'' condition.
    11.1.1.4  Mount the arrestor in the appropriate frame. Inspect 
for any airflow leak paths.

Run Sheet

Part 1. General Information

    Date and Time: ____________________ Test Operator: 
________________ Test #: ____________

    Paint Arrestor: Brand/Model ____________________

    Arrestor Assigned ID #____________

    Condition of arrestor (i.e., is there any damage? Must be new 
condition to proceed): ________________

    Manometer zero and level confirmed? ____________

Part 2. Clean Efficiency Test

    Date and Time: ____________________

    Optical Particle 20 min. warm up ____________

Counter:
    Zero count (<50 counts/min) ____________

    Daily PSL check ____________ PSL Diam: ____________ m

    File name for OPC data: ________________

Test Conditions:
    Air Flow: ____________

    Temp & RH: Temp ____________F RH ____________

    Atm. Pressure: ____________ inch Hg (from mercury barometer)

Aerosol Generator:
     Record all
    Operating

[[Page 55868]]

    Parameters

Test Aerosol:
    (Oleic acid or KCl) ____________

Arrestor:
    Pressure drop: at start ____________ inch H2O at end 
____________ inch H2O

    Condition of arrestor at end of test (note any phys. 
deterioration)

Figure 319-3. Test run sheet

    11.1.1.5  Install frame-mounted arrestor in the test duct. 
Remove the downstream window and examine the installed arrestor to 
verify that it is sealed in the duct. For tests with no arrestor, 
install the empty frame.
    11.1.1.6  Visually confirm the manometer zero and level. Adjust 
as needed.
    11.1.2  Clean Efficiency Test
    11.1.2.1  Record the date and time upon beginning this section.
    11.1.2.2  Optical Particle Counter
    11.1.2.2.1  General: Operate the OPC per the manufacturer's 
instructions allowing a minimum of 20 minutes warm up before making 
any measurements.
    11.1.2.2.2  Overload: The OPC will yield inaccurate data if the 
aerosol concentration it is attempting to measure exceeds its 
operating limit. To ensure reliable measurements, the maximum 
aerosol concentration will not exceed 10 percent of the 
manufacturer's claimed concentration limit. If this value is 
exceeded, reduce the aerosol concentration until the acceptable 
conditions are met.
    11.1.2.2.3  Zero Count: Connect a HEPA capsule to the inlet of 
the OPC and obtain printouts for three samples (each a minimum of 1-
minute each). Record maximum cumulative zero count. If the count 
rate exceeds 50 counts per minute, the OPC requires servicing before 
continuing.
    11.1.2.2.4  PSL Check of OPC Calibration: Confirm the 
calibration of the OPC by sampling a known size PSL aerosol. 
Aerosolize the PSL using an appropriate nebulizer. Record whether 
the peak count is observed in the proper channel. If the peak is not 
seen in the appropriate channel, have the OPC recalibrated.
    11.1.2.3  Test Conditions:
    11.1.2.3.1  Airflow: The test airflow corresponds to a nominal 
face velocity of 120 FPM through the arrestor. For arrestors having 
nominal 20''  x  20'' face dimensions, this measurement corresponds 
to an airflow of 333 cfm. For arrestors have nominal face dimensions 
of 24''  x  24'', this measurement corresponds to an airflow of 480 
cfm.
    11.1.2.3.2  Temperature and Relative Humidity: The temperature 
and relative humidity of the challenge air stream will be measured 
to within an accuracy of 2 deg.F and 5 
percent RH. To protect the probe from fouling, it may be removed 
during periods of aerosol generation.
    11.1.2.3.3  Barometric Pressure: Use a mercury barometer. Record 
the atmospheric pressure.
    11.1.2.4  Upstream and Downstream Background Counts
    11.1.2.4.1  With the arrestor installed in the test duct and the 
airflow set at the proper value, turn on the data acquisition 
computer and bring up the data acquisition program.
    11.1.2.4.2  Set the OPC settings for the appropriate test sample 
duration with output for both printer and computer data collection.
    11.1.2.4.3  Obtain 1 set of upstream-downstream background 
measurements.
    11.1.2.4.4  After obtaining the upstream-downstream 
measurements, stop data acquisition.
    11.1.2.5  Efficiency Measurements:
    11.1.2.5.1  Record the arrestor pressure drop.
    11.1.2.5.2  Turn on the Aerosol Generator. Begin aerosol 
generation and record the operating parameters.
    11.1.2.5.3  Monitor the particle counts. Allow a minimum of 10 
minutes for the generator to stabilize.
    11.1.2.5.4  Confirm that the total particle count does not 
exceed the predetermined upper limit. Adjust generator as needed.
    11.1.2.5.5  Confirm that a minimum of 50 particle counts are 
measured in the upstream sample in each of the OPC channels per 
sample. Adjust generator or sample time as needed.
    11.1.2.5.6  If you are unable to obtain a stable concentration 
within the concentration limit and with the 50 count minimum per 
channel, adjust the aerosol generator.
    11.1.2.5.7  When the counts are stable, perform repeated 
upstream-downstream sequential sampling until of 10 upstream-
downstream measurements are obtained. (Note, begin data acquisition 
with upstream sampling.)
    11.1.2.5.8  After collection of the 10 upstream-downstream 
samples, stop data acquisition and allow 2 more minutes for final 
purging of generator.
    11.1.2.5.9  Obtain 1 additional set of upstream-downstream 
background samples.
    11.1.2.5.10  After obtaining the upstream-downstream background 
samples, stop data acquisition.
    11.1.2.5.11  Record the arrestor pressure drop.
    11.1.2.5.12  Turn off blower.
    11.1.2.5.13  Remove the paint arrestor assembly from the test 
duct. Note any signs of physical deterioration.
    11.1.2.5.14  Remove the arrestor from the frame and place the 
arrestor in an appropriate storage bag.
    11.2  Control Test: 100 Percent Penetration Test. Three 100 
percent penetration tests must be performed as part of each test 
series. These tests are performed with no arrestor installed in the 
test housing. This test is relatively stringent test of the adequacy 
of the overall duct, sampling, measurement, and aerosol generation 
system. The test is performed as a normal penetration test except 
the paint arrestor is not used. A perfect system would yield a 
measured penetration of 1 at all particle sizes. Deviations from 1 
can occur due to particle losses in the duct, differences in the 
degree of aerosol uniformity (i.e., mixing) at the upstream and 
downstream probes, and differences in particle transport efficiency 
in the upstream and downstream sampling lines.
    11.3  Control Test: 0 Percent Penetration. One 0 percent 
penetration test must be performed as part of each test series. The 
test is performed by using a HEPA filter rather than a paint 
arrestor. This test assesses the adequacy of the instrument response 
time and sample line lag.

12.0  Data Analysis and Calculations

    12.1  Analysis. The analytical procedures for the fractional 
penetration and flow velocity measurements are described in Section 
11. Note that the primary measurement, that of the upstream and 
downstream aerosol concentrations, are performed with the OPC which 
acquires the sample and analyzes it in real time. Because all the 
test data is collected in real time, there are no analytical 
procedures performed subsequent to the actual test, only data 
analysis.
    12.2  Calculations
    12.2.1  Penetration

Nomenclature

U=Upstream particle count
D=Downstream particle count
Ub=Upstream background count
Db=Downstream background count
P100=100 percent penetration value determined in triplicate no 
filter tests
P=Penetration corrected for P100
=Sample standard deviation
CV=Coefficient of variation=/mean
E=Efficiency.

    Overbar denotes arithmetic mean of quantity.
    Analysis of each test involves the following quantities:
     P100 value for each sizing channel from the no 
filter tests.
     2 upstream background values.
     2 downstream background values.
     10 upstream values with aerosol generator on, and
     10 downstream values with aerosol generator on.
    Using the values associated with each sizing channel, the

[[Page 55869]]

[GRAPHIC] [TIFF OMITTED] TP29OC96.007


penetration associated with each particle sizing channel is 
calculated as:
    Most often, the background levels are small compared to the 
values when the aerosol generator is on.
    12.3  The relationship between the physical diameter 
(DPhysical) as measured by the OPC to the aerodynamic diameter 
(DAero) is given by:
[GRAPHIC] [TIFF OMITTED] TP29OC96.008

Where:

o=unit density of 1 g/cm3.
Particle=the density of the particle, 0.89 g/cm3 
for oleic acid.
CCFPhysical=the Cunningham Correction Factor at DPhysical.
CCFAero=the Cunningham Correction Factor at DAero.

    12.4  Presentation of Results. The test results must be 
presented in both graphical and tabular form.
    12.4.1  The X-axis of the graph will be a logarithmic scale of 
aerodynamic diameter from 0.1 to 100 m. The Y-axis will be 
Penetration on a linear scale from 0 to 1. Plots for each individual 
run and a plot of the average of triplicate solid-phase and of the 
average triplicate liquid-phase tests must be prepared. All plots 
are to based on point-to-point plotting (i.e., no curve fitting is 
to be used). The data are to be plotted based on the geometric mean 
diameter of each of the OPC's sizing channels.
    12.4.2  Tabulated data from each test must be provided. The data 
must include the upper and lower diameter bound and geometric mean 
diameter of each of the OPC sizing channels, the background particle 
counts for each channel for each sample, the upstream particle 
counts for each channel for each sample, the downstream particle 
counts for each channel for each sample, the 100 percent penetration 
values computed for each channel, and the 0 percent penetration 
values computed for each channel.

13.0  Pollution Prevention

    13.1  The quantities of materials to be aerosolized should be 
prepared in accord with the amount needed for the current tests so 
as to prevent wasteful excess.

14.0  Waste Management

    14.1  Paint arrestors may be returned to originator, if 
requested, or disposed of with regular laboratory waste.

15.0  References

    1. Hanley, J.T., D.D. Smith and L. Cox. ``Fractional Penetration 
of Paint Overspray Arrestors, Draft Final Report,'' EPA Cooperative 
Agreement CR-817083-01-0, January 1994.
    2. Hanley, J.T., D.D. Smith, and D.S. Ensor. ``Define a 
Fractional Efficiency Test Method that is Compatible with 
Particulate Removal Air Cleaners Used in General Ventilation,'' 
Final Report, 671-RP, American Society of Heating, Refrigerating, 
and Air-Conditioning Engineers, Inc., December 1993.
    3. ``Project Work and Quality Assurance Plan: Fractional 
Penetration of Paint Overspray Arrestors, Category II,'' EPA 
Cooperative Agreement No. CR-817083, July 1994.

[FR Doc. 96-27307 Filed 10-28-96; 8:45 am]
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