[Federal Register Volume 72, Number 1 (Wednesday, January 3, 2007)]
[Proposed Rules]
[Pages 50-55]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E6-22469]


 ========================================================================
 Proposed Rules
                                                 Federal Register
 ________________________________________________________________________
 
 This section of the FEDERAL REGISTER contains notices to the public of 
 the proposed issuance of rules and regulations. The purpose of these 
 notices is to give interested persons an opportunity to participate in 
 the rule making prior to the adoption of the final rules.
 
 ========================================================================
 

  Federal Register / Vol. 72, No. 1 / Wednesday, January 3, 2007 / 
Proposed Rules  

[[Page 50]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2006-26710; Directorate Identifier 2006-NM-147-AD]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 757 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 757 airplanes. This proposed AD would require 
revising the Airworthiness Limitations (AWLs) section of the 
Instructions for Continued Airworthiness by incorporating new 
limitations for fuel tank systems to satisfy Special Federal Aviation 
Regulation No. 88 requirements. The proposed AD also would require the 
initial inspection of certain repetitive inspections specified in the 
AWLs to phase-in those inspections, 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 fuel tank explosions and consequent loss of the 
airplane.

DATES: We must receive comments on this proposed AD by February 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: Docket Management Facility, U.S. Department of 
Transportation, 400 Seventh Street, SW., Nassif Building, room PL-401, 
Washington, DC 20590.
     Fax: (202) 493-2251.
     Hand Delivery: Room PL-401 on the plaza level of the 
Nassif Building, 400 Seventh Street, SW., 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 Avenue, 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-2006-
26710; Directorate Identifier 2006-NM-147-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 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 Management Facility office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The Docket Management Facility office (telephone (800) 647-
5227) is located on the plaza level of the Nassif 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'' 
(66 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

[[Page 51]]

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 a 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 AD are 
necessary to reduce 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 fuel tank explosions and consequent loss of the airplane.

Relevant Service Information

    We have reviewed the following sections of Boeing 757 Maintenance 
Planning Data (MPD) Document D622N001-9, Section 9, Revision March 2006 
(hereafter referred to as ``Revision March 2006 of the MPD''):
     Section E., ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEMS;''
     Section F., ``PAGE FORMAT: SYSTEMS AIRWORTHINESS 
LIMITATIONS;'' and
     Section G., ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEM 
AWLs.''
    Those sections of Revision March 2006 of the MPD describe new 
airworthiness limitations (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 (CDCCL), 
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 AWLs section of the Instructions for 
Continued Airworthiness by incorporating the information in the service 
information described previously. The proposed AD also would require 
the initial inspection of certain repetitive inspections specified in 
the AWLs to phase-in those inspections, and repair if necessary.

Rework Required When Implementing AWLs Into an Existing Fleet

    The AWLs revision for the fuel tank systems specified in paragraph 
(g) of this proposed AD, which involves incorporating the information 
specified in Revision March 2006 of the MPD, would affect how operators 
maintain their airplanes. After doing that AWLs revision, operators 
would need to do any maintenance on the fuel tank system as specified 
in the CDCCLs. Maintenance done before doing the AWLs 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 AWLs 
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 the AWL revision specified in 
paragraph (g) is done, except as provided by paragraph (h) of this 
proposed AD. This proposed AD would only require the AWLs revision 
specified in paragraph (g), and initial inspections 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 AWLs 
section of the Instructions for Continued Airworthiness by 
incorporating certain information specified in Revision March 2006 of 
the MPD into the MPD. Paragraph (g) also allows accomplishing the AWL 
revision in accordance with later revisions of the MPD as an acceptable 
method of compliance if they are approved by the Manager, Seattle 
Aircraft Certification Office (ACO), FAA. In addition, Section E. of 
Revision March 2006 of the MPD specifies that any deviations from the 
published AWL instructions, including AWL intervals, in that MPD must 
be approved by the Manager, Seattle ACO. Therefore, after doing the 
AWLs revision, any 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 E. of Revision March 2006 of the MPD 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 E. without consultation with the Manager, Seattle 
ACO. A non-U.S. operator should coordinate changes with its governing 
regulatory agency. As explained in Revision March 2006 of the MPD, 
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 their applicable maintenance manuals and task 
cards to address AWLs and to include notes about CDCCLs. Operators that 
may not use Boeing's revision service should revise their maintenance 
manuals and task cards to highlight actions that are 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. 
Operators may wish to use the appendix as an aid to implement the AWLs.

[[Page 52]]

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 G. of Revision March 
2006 of the MPD are inspections for which the applicable sections of 
the operating rules apply. Other AWLs are CDCCLs, which are tied to on-
condition 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 G. of Revision March 2006 of the MPD 
refer to specific revision levels of the CMMs as additional sources of 
service information for doing the AWLs. Boeing is referencing the CMMs 
by revision level in the applicable AWL for certain components rather 
than including information directly in the MPD 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, operators 
that have developed pump repair/overhaul manuals must get them approved 
by the Manager, Seattle ACO.

Changes to AMMs Referenced in Fuel Tank System AWLs

    In other AWLs in Subsection G. of Revision March 2006 of the MPD, 
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 can 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 990 airplanes of the affected design in the 
worldwide fleet. The following table provides the estimated costs for 
U.S. operators to comply with this proposed AD.

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                      Number of
                                                   Work      Average      Cost per      U.S.-
                    Action                        hours     labor rate    airplane    registered    Fleet cost
                                                             per hour                 airplanes
----------------------------------------------------------------------------------------------------------------
Revision of AWL of the Instructions for                 8          $80         $640          639        $408,960
 Continued Airworthiness......................
Detailed and special detailed inspections.....          8          $80         $640          639        $408,960
----------------------------------------------------------------------------------------------------------------

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-2006-26710; Directorate Identifier 2006-NM-
147-AD.

Comments Due Date

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

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to all Boeing Model 757-200, -200PF, -200CB, 
and -300 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

[[Page 53]]

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 (AWLs) in the Boeing 
757 Maintenance Planning Data (MPD) Document D622N001-9 according to 
paragraph (g) of this AD.

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 fuel tank explosions 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

    (f) The term ``Revision March 2006 of the MPD'' as used in this 
AD, means Section 9 of Boeing 757 MPD Document D622N001-9, Revision 
March 2006.

Revision of AWLs Section

    (g) Within 18 months after the effective date of this AD, revise 
the AWLs section of the Instructions for Continued Airworthiness by 
incorporating the information in the sections specified in 
paragraphs (g)(1) through (g)(3) of this AD into the MPD, except 
that the inspections specified in Table 1 of this AD may be done at 
the compliance times specified in Table 1. Accomplishing the 
revision in accordance with a later revision of the MPD is an 
acceptable method of compliance if the revision is approved by the 
Manager, Seattle Aircraft Certification Office (ACO), FAA.
    (1) Section E., ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEMS,'' of 
Revision March 2006 of the MPD.
    (2) Section F., ``PAGE FORMAT: SYSTEMS AIRWORTHINESS 
LIMITATIONS,'' of Revision March 2006 of the MPD.
    (3) Section G., ``AIRWORTHINESS LIMITATIONS--FUEL SYSTEM AWLs'' 
of Revision March 2006 of the MPD.

Initial Inspections and Repair

    (h) Do the inspections specified in Table 1 of this AD and 
repair any discrepancy, in accordance with Section G., 
``AIRWORTHINESS LIMITATIONS--FUEL SYSTEM AWLs,'' of Revision March 
2006 of the MPD. The repair must be done before further flight.

                                          Table 1.--Initial Inspections
----------------------------------------------------------------------------------------------------------------
                                                                    Compliance Time (whichever occurs later)
   Airworthiness Limitations Number          Description       -------------------------------------------------
                                                                       Threshold               Grace Period
----------------------------------------------------------------------------------------------------------------
(1) 28-AWL-01........................  A detailed inspection    Before the accumulation  Within 72 months after
                                        of external wires over   of 36,000 total flight   the effective date of
                                        the center fuel tank     cycles, or within 120    this AD.
                                        for damaged clamps,      months since the date
                                        wire chafing, and wire   of issuance of the
                                        bundles in contact       original standard
                                        with the surface of      airworthiness
                                        the center fuel tank.    certificate or the
                                                                 date of issuance of
                                                                 the original export
                                                                 certificate of
                                                                 airworthiness,
                                                                 whichever occurs first.
(2) 28-AWL-03........................  A special detailed       Before the accumulation  Within 24 months after
                                        inspection of the        of 36,000 total flight   the effective date of
                                        lightning shield to      cycles, or within 120    this AD
                                        ground termination on    months since the date
                                        the out-of-tank fuel     of issuance of the
                                        quantity indicating      original standard
                                        system to verify         airworthiness
                                        functional integrity.    certificate or the
                                                                 date of issuance of
                                                                 the original export
                                                                 certificate of
                                                                 airworthiness,
                                                                 whichever occurs first.
(3) 28-AWL-14........................  A special detailed       Before the accumulation  Within 60 months after
                                        inspection of the        of 36,000 total flight   the effective date of
                                        fault current bond of    cycles, or within 120    this AD
                                        the fueling shutoff      months since the date
                                        valve actuator of the    of issuance of the
                                        center wing tank to      original standard
                                        verify electrical bond.  airworthiness
                                                                 certificate or the
                                                                 date of issuance of
                                                                 the original export
                                                                 certificate of
                                                                 airworthiness,
                                                                 whichever occurs first.
----------------------------------------------------------------------------------------------------------------


    Note 2: For the purposes of this AD, a detailed inspection is: 
``An intensive examination of a specific item, installation, or 
assembly to detect damage, failure, or irregularity. Available 
lighting is normally supplemented with a direct source of good 
lighting at an intensity deemed appropriate. Inspection aids such as 
mirror, magnifying lenses, etc., may be necessary. Surface cleaning 
and elaborate procedures may be required.''


    Note 3: 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.''

Alternative Methods of Compliance (AMOCs)

    (i)(1) The Manager, Seattle ACO has the authority to approve 
AMOCs for this AD, if requested in accordance with the procedures 
found in 14 CFR 39.19.
    (2) Before using any AMOC approved in accordance with Sec.  
39.19 on any airplane to which the AMOC applies, notify the 
appropriate principal inspector in the FAA Flight Standards 
Certificate Holding District Office.

    Issued in Renton, Washington, on December 21, 2006.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.

Appendix 1. Fuel Tank System Airworthiness Limitations--Applicable 
Maintenance Manuals

----------------------------------------------------------------------------------------------------------------
                                                      ATA section or CMM
          AWL                 ALI/CDCCL           document           Task title        Task 
----------------------------------------------------------------------------------------------------------------
28-AWL-01.......................  ALI...............  AMM 28-11-00/601..  External Wires      28-11-00-206-221.
                                                                           Over the Center
                                                                           Tank Inspection.

[[Page 54]]

 
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.
28-AWL-06.......................  CDCCL.............  CMM 28-41-68
                                                       Revision 4 or
                                                       subsequent
                                                       revisions.
28-AWL-07.......................  CDCCL.............  CMM 28-40-56,
                                                       Revision 4; CMM
                                                       28-40-62,
                                                       revision 3; CMM
                                                       28-40-59,
                                                       revision 5; or
                                                       subsequent
                                                       revisions.
28-AWL-08.......................  CDCCL.............  SWPM 20-14-12.....  Repair of Fuel
                                                                           Quantity
                                                                           Indicator System
                                                                           (FQIS) Wire
                                                                           Harness.
                                                      AMM 28-41-09/401..  Install the Tank    Varies with
                                                                           Wiring Harness.     configuration
28-AWL-09.......................  CDCCL.............  AMM 29-11-26/401..  Install the Heat    29-11-26-404-012.
                                                                           Exchanger.
28-AWL-10.......................  CDCCL.............  AMM 28-22-07/401..  Install the Fuel    28-22-07-404-005.
                                                                           Line and Fittings.
28-AWL-11.......................  CDCCL.............
28-AWL-12.......................  CDCCL.............  CMM 28-22-08,
                                                       revision 3; CMM
                                                       28-20-02,
                                                       revision 9; or
                                                       subsequent
                                                       revisions.
28-AWL-13.......................  CDCCL.............  AMM 28-22-03/401..  Install the Fuel    28-22-03-404-007.
                                                                           Boost Pump
                                                                           Assembly or the
                                                                           Fuel Override
                                                                           Pump Assembly.
28-AWL-14.......................  ALI...............  AMM 28-21-02/401..  Fueling Shutoff     28-21-02-764-047.
                                                                           Valve Resistance
                                                                           Check.
28-AWL-15.......................  CDCCL.............  AMM 28-21-02/401..  Install the         28-21-02-404-019.
                                                                           Fueling Shutoff
                                                                           Valve.
                                                      AMM 28-21-12/401..  Install the         28-21-12-404-015.
                                                                           Actuator of the
                                                                           Fueling Shutoff
                                                                           Valve.
28-AWL-16.......................  CDCCL.............  AMM 28-11-01/401..  Install the Main    28-11-01-404-014.
                                                                           Tank Access Door.
                                                      AMM 28-11-02/401..  Install the Center  28-11-02-404-019.
                                                                           Tank Access Door.
                                                      AMM 28-11-03/401..  Install the Surge   28-11-03-404-008.
                                                                           Tank Access Door.
28-AWL-17.......................  CDCCL.............  AMM 28-11-03/401..  Install the Surge   28-11-03-404-008.
                                                                           Tank Access Door.
                                                      AMM 28-13-04/201..  Install the         28-13-04-402-014.
                                                                           Pressure Relief
                                                                           Valve.
28-AWL-18.......................  CDCCL.............  AMM 28-11-03/401..  Install the Surge   28-11-03-404-008.
                                                                           Tank Access Door.
                                                      AMM 28-13-05/401..  Install the         28-13-05-404-004.
                                                                           Housing of the
                                                                           Vent Flame
                                                                           Arrestor.
28-AWL-19.......................  CDCCL.............  FIM 28-22-00/101..  Engine Fuel Feed
                                                                           System--Fault
                                                                           Isolation.
28-AWL-20.......................  ALI...............  AMM 28-22-00/501..  Center Tank Fuel    28-22-00-725-507.
                                                                           Override Pump
                                                                           Auto Shutoff
                                                                           Functional Test.
28-AWL-21.......................  ALI...............  AMM 28-22-00/501..
28-AWL-22.......................  CDCCL.............  AMM 28-41-24/401..  Densitometer Hot    28-41-24-404-006.
                                                                           Short Protector
                                                                           Installation.
28-AWL-23.......................  CDCCL.............  AMM 28-22-01/401..
                                                      AMM 28-22-02/401..
                                                      AMM 28-22-11/401..
                                                      AMM 28-22-12/401..
                                                      AMM 28-26-01/401..
                                                      AMM 28-26-02/401..
28-AWL-24.......................  CDCCL.............  CMM 28-20-21......
----------------------------------------------------------------------------------------------------------------


[[Page 55]]

 [FR Doc. E6-22469 Filed 12-29-06; 8:45 am]
BILLING CODE 4910-13-P