[Federal Register Volume 72, Number 129 (Friday, July 6, 2007)]
[Proposed Rules]
[Pages 36907-36912]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E7-13107]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-28383; Directorate Identifier 2006-NM-180-AD]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 737-100, -200, -200C, -
300, -400, and -500 Series Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for all Boeing Model 737-100, -200, -200C, -300, -400, and -500 series 
airplanes. This proposed AD would require revising the FAA-approved 
maintenance program to incorporate new airworthiness limitations (AWLs) 
for fuel tank systems to satisfy Special Federal Aviation Regulation 
No. 88 requirements. This proposed AD would also require the initial 
inspection of a certain repetitive AWL inspection to phase in that 
inspection, and repair if necessary. This proposed AD results from a 
design review of the fuel tank systems. We are proposing this AD to 
prevent the potential for ignition sources inside fuel tanks caused by 
latent failures, alterations, repairs, or maintenance actions, which, 
in combination with flammable fuel vapors, could result in a fuel tank 
explosion and consequent loss of the airplane.

DATES: We must receive comments on this proposed AD by August 20, 2007.

ADDRESSES: Use one of the following addresses to submit comments on 
this proposed AD.
     DOT Docket Web site: Go to http://dms.dot.gov and follow 
the instructions for sending your comments electronically.
     Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your 
comments electronically.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Fax: (202) 493-2251.
     Hand Delivery: Room W12-140 on the ground floor of the 
West Building, 1200 New Jersey Avenue, SE., Washington, DC, between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, 
Washington 98124-2207, for the service information identified in this 
proposed AD.

FOR FURTHER INFORMATION CONTACT: Kathrine Rask, Aerospace Engineer, 
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification 
Office, 1601 Lind Ave., SW., Renton, Washington 98057-3356; telephone 
(425) 917-6505; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to submit any relevant written data, views, or 
arguments regarding this proposed AD. Send your comments to an address 
listed in the ADDRESSES section. Include the docket number ``FAA-2007-
28383; Directorate Identifier 2006-NM-180-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the proposed AD. We will 
consider all comments received by the closing date and may amend the 
proposed AD in light of those comments.
    We will post all comments we receive, without change, to http://dms.dot.gov, including any personal information you provide. We will 
also post a report summarizing each substantive verbal contact with FAA 
personnel concerning this proposed AD. Using the search function of 
that web site, anyone can find and read the comments in any of our 
dockets, including the name of the individual who sent the comment (or 
signed the comment on behalf of an association, business, labor union, 
etc.). You may review DOT's complete Privacy Act

[[Page 36908]]

Statement in the Federal Register published on April 11, 2000 (65 FR 
19477-78), or you may visit http://dms.dot.gov.

Examining the Docket

    You may examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Operations office between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The 
Docket Operations office (telephone (800) 647-5527) is located on the 
ground floor of the West Building at the DOT street address stated in 
the ADDRESSES section. Comments will be available in the AD docket 
shortly after the Docket Management System receives them.

Discussion

    The FAA has examined the underlying safety issues involved in fuel 
tank explosions on several large transport airplanes, including the 
adequacy of existing regulations, the service history of airplanes 
subject to those regulations, and existing maintenance practices for 
fuel tank systems. As a result of those findings, we issued a 
regulation titled ``Transport Airplane Fuel Tank System Design Review, 
Flammability Reduction and Maintenance and Inspection Requirements'' 
(67 FR 23086, May 7, 2001). In addition to new airworthiness standards 
for transport airplanes and new maintenance requirements, this rule 
included Special Federal Aviation Regulation No. 88 (``SFAR 88,'' 
Amendment 21-78, and subsequent Amendments 21-82 and 21-83).
    Among other actions, SFAR 88 requires certain type design (i.e., 
type certificate (TC) and supplemental type certificate (STC)) holders 
to substantiate that their fuel tank systems can prevent ignition 
sources in the fuel tanks. This requirement applies to type design 
holders for large turbine-powered transport airplanes and for 
subsequent modifications to those airplanes. It requires them to 
perform design reviews and to develop design changes and maintenance 
procedures if their designs do not meet the new fuel tank safety 
standards. As explained in the preamble to the rule, we intended to 
adopt airworthiness directives to mandate any changes found necessary 
to address unsafe conditions identified as a result of these reviews.
    In evaluating these design reviews, we have established four 
criteria intended to define the unsafe conditions associated with fuel 
tank systems that require corrective actions. The percentage of 
operating time during which fuel tanks are exposed to flammable 
conditions is one of these criteria. The other three criteria address 
the failure types under evaluation: single failures, single failures in 
combination with another latent condition(s), and in-service failure 
experience. For all four criteria, the evaluations included 
consideration of previous actions taken that may mitigate the need for 
further action.
    We have determined that the actions identified in this proposed AD 
are necessary to reduce the potential of ignition sources inside fuel 
tanks, which, in combination with flammable fuel vapors, could result 
in a fuel tank explosion and consequent loss of the airplane.

Relevant Service Information

    We have reviewed Boeing 737-100/200/200C/300/400/500 Airworthiness 
Limitations (AWLs) and Certification Maintenance Requirements (CMRs), 
D6-38278-CMR, Revision May 2006 (hereafter referred to as ``Revision 
May 2006 of Document D6-38278-CMR''). Section C of Revision May 2006 of 
Document D6-38278-CMR describes new AWLs for fuel tank systems. The new 
AWLs include:
     AWL inspections, which are periodic inspections of certain 
features for latent failures that could contribute to an ignition 
source; and
     Critical design configuration control limitations 
(CDCCLs), which are limitation requirements to preserve a critical 
ignition source prevention feature of the fuel tank system design that 
is necessary to prevent the occurrence of an unsafe condition. The 
purpose of a CDCCL is to provide instruction to retain the critical 
ignition source prevention feature during configuration change that may 
be caused by alterations, repairs, or maintenance actions. A CDCCL is 
not a periodic inspection.
    Accomplishing the actions specified in the service information is 
intended to adequately address the unsafe condition.

FAA's Determination and Requirements of the Proposed AD

    We have evaluated all pertinent information and identified an 
unsafe condition that is likely to exist or develop on other airplanes 
of this same type design. For this reason, we are proposing this AD, 
which would require revising the FAA-approved maintenance program to 
incorporate the information in Section C of Revision May 2006 of 
Document D6-38278-CMR. This proposed AD would also require the initial 
inspection of a certain repetitive AWL inspection to phase in that 
inspection, and repair if necessary.

Explanation of Compliance Time

    In most ADs, we adopt a compliance time allowing a specified amount 
of time after the AD's effective date. In this case, however, the FAA 
has already issued regulations that require operators to revise their 
maintenance/inspection programs to address fuel tank safety issues. The 
compliance date for these regulations is December 16, 2008. To provide 
for efficient and coordinated implementation of these regulations and 
this proposed AD, we are using this same compliance date in this 
proposed AD, instead of the 18-month compliance time recommended by 
Boeing.

Rework Required When Implementing AWLs Into an Existing Fleet

    The maintenance program revision for the fuel tank systems 
specified in paragraph (g) of this proposed AD, which involves 
incorporating the information specified in Revision May 2006 of 
Document D6-38278-CMR, would affect how operators maintain their 
airplanes. After doing that maintenance program revision, operators 
would need to do any maintenance on the fuel tank system as specified 
in the CDCCLs. Maintenance done before the maintenance program revision 
specified in paragraph (g) would not need to be redone in order to 
comply with paragraph (g). For example, the AWL that requires fuel 
pumps to be repaired and overhauled per an FAA-approved component 
maintenance manual (CMM) applies to fuel pumps repaired after the 
maintenance programs are revised; spare or on-wing fuel pumps do not 
need to be reworked. For AWLs that require repetitive inspections, the 
initial inspection interval (threshold) starts from the date that the 
maintenance program revision specified in paragraph (g) is done, except 
as provided by paragraph (h) of this proposed AD. This proposed AD 
would require only the maintenance program revision specified in 
paragraph (g) and the initial inspection specified in paragraph (h). No 
other fleet-wide inspections need to be done.

Changes to Fuel Tank System AWLs

    Paragraph (g) of this proposed AD would require revising the FAA-
approved maintenance program by incorporating certain information 
specified in Revision May 2006 of Document D6-38278-CMR. Paragraph (g) 
allows accomplishing the maintenance program revision in accordance 
with later revisions of

[[Page 36909]]

Document D6-38278-CMR as an acceptable method of compliance if they are 
approved by the Manager, Seattle Aircraft Certification Office (ACO), 
FAA. Paragraph (h) allows accomplishing the initial inspection and 
repair in accordance with later revisions of Document D6-38278-CMR as 
an acceptable method of compliance if they are approved by the Manager, 
Seattle ACO. In addition, Section C of Revision March 2006 of Document 
D6-38278-CMR specifies that any deviations from the published AWL 
instructions, including AWL intervals, must be approved by the Manager, 
Seattle ACO. Therefore, after the maintenance program revision, any 
further revision to an AWL or AWL interval should be done as an AWL 
change, not as an alternative method of compliance (AMOC). For U.S.-
registered airplanes, operators must make requests through an 
appropriate FAA Principal Maintenance Inspector (PMI) or Principal 
Avionics Inspector (PAI) for approval by the Manager, Seattle ACO. A 
non-U.S. operator should coordinate changes with its governing 
regulatory agency.

Exceptional Short-Term Extensions

    Section C of Revision March 2006 of Document D6-38278-CMR has 
provisions for an exceptional short-term extension of 30 days. An 
exceptional short-term extension is an increase in an AWL interval that 
may be needed to cover an uncontrollable or unexpected situation. For 
U.S.-registered airplanes, the FAA PMI or PAI must concur with any 
exceptional short-term extension before it is used, unless the operator 
has identified another appropriate procedure with the local regulatory 
authority. The FAA PMI or PAI may grant the exceptional short-term 
extensions described in Section C without consultation with the 
Manager, Seattle ACO. A non-U.S. operator should coordinate changes 
with its governing regulatory agency. As explained in Section C, 
exceptional short-term extensions must not be used for fleet AWL 
extensions. An exceptional short-term extension should not be confused 
with an operator's short-term escalation authorization approved in 
accordance with the Operations Specifications or the operator's 
reliability program.

Ensuring Compliance With Fuel Tank System AWLs

    Boeing has revised applicable maintenance manuals and task cards to 
address AWLs and to include notes about CDCCLs. Operators that do not 
use Boeing's revision service should revise their maintenance manuals 
and task cards to highlight actions tied to CDCCLs to ensure that 
maintenance personnel are complying with the CDCCLs. Appendix 1 of this 
proposed AD contains a list of Air Transport Association (ATA) sections 
for the revised maintenance manuals for Model 737-100, -200, and -200C 
series airplanes. Appendix 2 of this proposed AD contains a list of ATA 
sections for the revised maintenance manuals for Model 737-300, -400, 
and -500 series airplanes. Operators might wish to use the appendices 
as an aid to implement the AWLs.

Recording Compliance With Fuel Tank System AWLs

    The applicable operating rules of the Federal Aviation Regulations 
(14 CFR parts 91, 121, 125, and 129) require operators to maintain 
records with the identification of the current inspection status of an 
airplane. Some of the AWLs contained in Section C of Revision March 
2006 of Document D6-38278-CMR are inspections for which the applicable 
sections of the operating rules apply. Other AWLs are CDCCLs, which are 
tied to conditional maintenance actions. An entry into an operator's 
existing maintenance record system for corrective action is sufficient 
for recording compliance with CDCCLs, as long as the applicable 
maintenance manual and task cards identify actions that are CDCCLs.

Changes to CMMs Cited in Fuel Tank System AWLs

    Some of the AWLs in Section C of Revision March 2006 of Document 
D6-38278-CMR refer to specific revision levels of the CMMs as 
additional sources of service information for doing the AWLs. Boeing is 
referring to the CMMs by revision level in the applicable AWL for 
certain components rather than including information directly in the 
AWL because of the volume of that information. As a result, the 
Manager, Seattle ACO, must approve the CMMs. Any later revision of 
those CMMs will be handled like a change to the AWL itself. Any use of 
parts (including the use of parts manufacturer approval (PMA) approved 
parts), methods, techniques, and practices not contained in the CMMs 
need to be approved by the Manager, Seattle ACO, or governing 
regulatory authority. For example, certain pump repair/overhaul manuals 
must be approved by the Manager, Seattle ACO.

Changes to AMMs Referenced in Fuel Tank System AWLs

    In other AWLs in Section C of Revision March 2006 of Document D6-
38278-CMR, the AWLs contain all the necessary data. The applicable 
section of the maintenance manual is usually included in the AWLs. 
Boeing intended this information to assist operators in maintaining the 
maintenance manuals. A maintenance manual change to these tasks may be 
made without approval by the Manager, Seattle ACO, through an 
appropriate FAA PMI or PAI, by the governing regulatory authority, or 
by using the operator's standard process for revising maintenance 
manuals. An acceptable change would have to maintain the information 
specified in the AWL such as the pass/fail criteria or special test 
equipment.

Costs of Compliance

    There are about 2,337 airplanes of the affected design in the 
worldwide fleet. The following table provides the estimated costs, at 
an average labor rate of $80 per hour, for U.S. operators to comply 
with this proposed AD.

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                         Number of
                                                                             Cost per      U.S.-
               Action                  Work hours           Parts            airplane    registered   Fleet cost
                                                                                         airplanes
----------------------------------------------------------------------------------------------------------------
Maintenance program revision........            8  None..................         $640          672     $430,080
Inspection..........................            8  None..................          640          672      430,080
----------------------------------------------------------------------------------------------------------------


[[Page 36910]]

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, Section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would not 
have a substantial direct effect on the States, on the relationship 
between the national Government and the States, or on the distribution 
of power and responsibilities among the various levels of government.
    For the reasons discussed above, I certify that the proposed 
regulation:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979); and
    3. Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket. See the 
ADDRESSES section for a location to examine the regulatory evaluation.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

    2. The Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

Boeing: Docket No. FAA-2007-28383; Directorate Identifier 2006-NM-
180-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by August 
20, 2007.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to all Boeing Model 737-100, -200, -200C, -
300, -400, and -500 series airplanes, certificated in any category.

    Note 1: This AD requires revisions to certain operator 
maintenance documents to include new inspections and maintenance 
actions. Compliance with these limitations is required by 14 CFR 
43.16 and 91.403(c). For airplanes that have been previously 
modified, altered, or repaired in the areas addressed by these 
limitations, the operator may not be able to accomplish the actions 
described in the revisions. In this situation, to comply with 14 CFR 
43.16 and 91.403(c), the operator must request approval for revision 
to the airworthiness limitations in the Boeing 737-100/200/200C/300/
400/500 Airworthiness Limitations (AWLs) and Certification 
Maintenance Requirements (CMRs), D6-38278-CMR, according to 
paragraph (g) or (i) of this AD, as applicable.

Unsafe Condition

    (d) This AD results from a design review of the fuel tank 
systems. We are issuing this AD to prevent the potential for 
ignition sources inside fuel tanks caused by latent failures, 
alterations, repairs, or maintenance actions, which, in combination 
with flammable fuel vapors, could result in a fuel tank explosion 
and consequent loss of the airplane.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Service Information Reference

    (f) The term ``Revision May 2006 of Document D6-38278-CMR'' as 
used in this AD, means Boeing 737-100/200/200C/300/400/500 AWLs and 
CMRs, D6-38278-CMR, Revision May 2006.

Maintenance Program Revision

    (g) Before December 16, 2008, revise the FAA-approved 
maintenance program to incorporate the information in Section C of 
Revision May 2006 of Document D6-38278-CMR; except that the initial 
inspection required by paragraph (h) of this AD must be done at the 
applicable compliance time specified in that paragraph. 
Accomplishing the revision in accordance with a later revision of 
Document D6-38278-CMR is an acceptable method of compliance if the 
revision is approved by the Manager, Seattle Aircraft Certification 
Office (ACO), FAA.

Initial Inspection and Repair if Necessary

    (h) At the later of the compliance times specified in paragraphs 
(h)(1) and (h)(2) of this AD, do a special detailed inspection of 
the lightning shield to ground termination on the out-of-tank fuel 
quantity indication system (FQIS) wiring to verify functional 
integrity, in accordance with AWL Number 28-AWL-03 of Section C of 
Revision May 2006 of Document D6-38278-CMR. If any discrepancy is 
found during the inspection, repair the discrepancy before further 
flight in accordance with AWL Number 28-AWL-03 of Section C of 
Revision May 2006 of Document D6-38278-CMR. Accomplishing the 
actions required by this paragraph in accordance with a later 
revision of Document D6-38278-CMR is an acceptable method of 
compliance if the revision is approved by the Manager, Seattle ACO.

    Note 2: For the purposes of this AD, a special detailed 
inspection is: ``An intensive examination of a specific item, 
installation, or assembly to detect damage, failure, or 
irregularity. The examination is likely to make extensive use of 
specialized inspection techniques and/or equipment. Intricate 
cleaning and substantial access or disassembly procedure may be 
required.''

    (1) Prior to the accumulation of 36,000 total flight hours, or 
within 120 months since the date of issuance of the original 
standard airworthiness certification or the date of issuance of the 
original export certificate of airworthiness, whichever ever occurs 
first.
    (2) Within 24 months after the effective date of this AD.

Alternative Methods of Compliance (AMOCs)

    (i)(1) The Manager, Seattle Aircraft Certification Office, has 
the authority to approve AMOCs for this AD, if requested in 
accordance with the procedures found in 14 CFR 39.19.
    (2) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Before using any approved AMOC on any airplane to which the AMOC 
applies, notify your appropriate principal inspector (PI) in the FAA 
Flight Standards District Office (FSDO), or lacking a PI, your local 
FSDO.

[[Page 36911]]



  Appendix 1.--Implementing Fuel Tank System Airworthiness Limitations on Model 737-100, -200, and -200C Series
                                                    Airplanes
----------------------------------------------------------------------------------------------------------------
                                                               ATA section or CMM
              AWL No.                     ALI/CDCCL                 document                   Task title
----------------------------------------------------------------------------------------------------------------
28-AWL-01.........................  ALI..................  AMM 28-11-00/601..........  External Wires Over the
                                                                                        Center Tank Inspection.
28-AWL-02.........................  CDCCL................  SWPM 20-10-11.............  Wiring Assembly and
                                                                                        Installation
                                                                                        Configuration.
28-AWL-03.........................  ALI..................  AMM 20-55-54/601..........  FQIS Connectors--
                                                                                        Inspection/Check.
28-AWL-04.........................  CDCCL................  SWPM 20-10-15.............  Assembly of Shield Ground
                                                                                        Wires.
28-AWL-05.........................  CDCCL................  SWPM 20-10-11.............  Wiring Assembly and
                                                                                        Installation
                                                                                        Configuration.
28-AWL-06.........................  CDCCL................  CMM 28-41-11, Revision 12;
                                                            CMM 28-41-13, Revision
                                                            11; CMM 28-41-23,
                                                            Revision 10; or
                                                            subsequent revisions.
28-AWL-07.........................  CDCCL................  CMM 28-40-25, Revision L;
                                                            CMM 28-41-05, Revision
                                                            11; CMM 28-40-58,
                                                            Revision 4; or subsequent
                                                            revisions.
28-AWL-08.........................  CDCCL................  AMM 28-41-101/401.........  Remove/Install Fuel Tank
                                                                                        Bulkhead (Spar)
                                                                                        Receptacle Wire Harness.
28-AWL-09.........................  CDCCL................  AMM 29-11-53/401..........  Install System A
                                                                                        Hydraulic Fluid Heat
                                                                                        Exchanger.
28-AWL-10.........................  CDCCL................  AMM 28-22-142/401.........  Install the Bulkhead
                                                                                        Fitting.
28-AWL-11.........................  CDCCL................
28-AWL-12.........................  CDCCL................  CMM 28-20-37, Revision 10;
                                                            CMM 28-20-1, Revision 7;
                                                            CMM 28-20-5, Revision 6;
                                                            CMM 28-20-07, Revision 1;
                                                            or subsequent revisions.
28-AWL-13.........................  CDCCL................  AMM 28-22-41/401..........  Install the Boost Pump.
28-AWL-14.........................  CDCCL................  AMM 28-21-71/401..........  Float Switch
                                                                                        Installation.
28-AWL-15.........................  CDCCL................  AMM 28-11-13/401..........  Install Center Tank
                                                                                        Access Panel.
28-AWL-16.........................  CDCCL................  AMM 28-11-11/401..........  Removal/Installation of
                                                                                        Access Panels 1 Thru 13.
28-AWL-17.........................  CDCCL................  AMM 28-11-11/401..........  Removal/Installation of
                                                                                        Access Panels No. 14.
                                                           AMM 28-13-31/401..........  Install Flame Arrestor.
28-AWL-18.........................  CDCCL................  AMM 28-22-41/601..........  Fuel Boost Pump Wiring
                                                                                        and Conduit--Inspection/
                                                                                        Check.
28-AWL-19.........................  CDCCL................  AMM 28-22-00/101..........  Troubleshoot the Fuel
                                                                                        Feed System
28-AWL-20.........................  CDCCL................
----------------------------------------------------------------------------------------------------------------


  Appendix 2.--Implementing Fuel Tank System Airworthiness Limitations on Model 737-300, -400, and -500 Series
                                                    Airplanes
----------------------------------------------------------------------------------------------------------------
                                                          ATA section or
          AWL No.                    ALI/CDCCL             CMM document        Task title          Task No.
----------------------------------------------------------------------------------------------------------------
28-AWL-01.................  ALI.......................  AMM 28-11-00/601.  External Wires       28-11-00-206-281
                                                                            Over the Center
                                                                            Tank Inspection.
28-AWL-02.................  CDCCL.....................  SWPM 20-10-11....  Wiring Assembly
                                                                            and Installation
                                                                            Configuration.
28-AWL-03.................  ALI.......................  AMM 20-55-54/601.  FQIS Connectors--    20-55-54-286-001
                                                                            Inspection/Check.
28-AWL-04.................  CDCCL.....................  SWPM 20-10-15....  Assembly of        ..................
                                                                            Shield Ground
                                                                            Wires.
28-AWL-05.................  CDCCL.....................  SWPM 20-10-11....  Wiring Assembly    ..................
                                                                            and Installation
                                                                            Configuration.
                                                        AMM 28-41-72/401.  Isolated Fuel        28-41-72-404-018
                                                                            Quantity
                                                                            Transmitter
                                                                            (IFQT)
                                                                            Installation.
28-AWL-06.................  CDCCL.....................  .................  .................  ..................
28-AWL-07.................  CDCCL.....................  CMM 28-40-25,      .................  ..................
                                                         Revision L; CMM
                                                         28-41-05,
                                                         Revision 11; CMM
                                                         28-40-58,
                                                         Revision 4; or
                                                         subsequent
                                                         revisions.
28-AWL-08.................  CDCCL.....................  SWPM 20-14-12....  Repair of Fuel     ..................
                                                                            Quantity
                                                                            Indicator System
                                                                            (FQIS) Wire
                                                                            Harness.
                                                        AMM 28-41-44/401.  Wire Bundle          28-41-44-404-001
                                                                            Replacement.
28-AWL-09.................  CDCCL.....................  AMM 29-15-04/401.  Heat Exchanger       29-15-04-294-048
                                                                            Installation.
28-AWL-10.................  CDCCL.....................  AMM 28-22-15/401.  Engine Fuel Feed     28-22-15-404-044
                                                                            Tube Bulkhead
                                                                            Fitting
                                                                            Installation.
28-AWL-11.................  CDCCL
28-AWL-12.................  CDCCL.....................  CMM 28-20-07,      .................  ..................
                                                         Revision 10; CMM
                                                         28-20-1,
                                                         Revision 7; CMM
                                                         28-20-5,
                                                         Revision 6; CMM
                                                         28-20-07,
                                                         Revision 1; or
                                                         subsequent
                                                         revisions.
28-AWL-13.................  CDCCL.....................  AMM 28-22-41/401.  Fuel Boost Pump      28-22-41-404-019
                                                                            Installation.

[[Page 36912]]

 
28-AWL-14.................  CDCCL.....................  AMM 28-21-71/401.  AIRPLANES WITH       28-22-71-404-013
                                                                            TYPE I FLOAT
                                                                            SWITCH; Float
                                                                            Switch
                                                                            Installation.
                                                                           AIRPLANES WITH       28-22-71-424-093
                                                                            TYPE II FLOAT
                                                                            SWITCH; Float
                                                                            Switch
                                                                            Installation.
28-AWL-15.................  CDCCL.....................  AMM 28-11-31/401.  Center Tank          28-11-31-404-008
                                                                            Access Panel
                                                                            Installation.
28-AWL-16.................  CDCCL.....................  AMM 28-11-11/401.  Access Panels No.    28-11-11-404-002
                                                                            1 thru 13
                                                                            Installation.
28-AWL-17.................  CDCCL.....................  AMM 28-13-41/401.  Pressure Relief      28-13-41-404-010
                                                                            Valve
                                                                            Installation.
                                                                           Access Panel No.     28-11-11-404-004
                                                                            14 Installation.
                                                        AMM 28-13-31/401.  Flame Arrester      28-13-31-404-007,
                                                                            Installation.                     or
                                                                                                28-13-31-404-032
28-AWL-18.................  CDCCL.....................  AMM 28-22-00/601.  Fuel Boost Pump      28-22-00-216-033
                                                                            Wiring in
                                                                            Conduit, No. 1
                                                                            Tank Inspection.
                                                                           Fuel Boost Pump      28-22-00-216-044
                                                                            Wiring in
                                                                            Conduit, No. 1
                                                                            Tank Inspection.
28-AWL-19.................  CDCCL.....................  AMM 28-22-00/101.  Engine Fuel Feed   ..................
                                                                            System--Trouble
                                                                            Shooting.
----------------------------------------------------------------------------------------------------------------


    Issued in Renton, Washington, on June 22, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E7-13107 Filed 7-5-07; 8:45 am]
BILLING CODE 4910-13-P