fuel tank vapors, 777

[Federal Register: July 3, 2007 (Volume 72, Number 127)]
[Proposed Rules]
[Page 36373-36378]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr03jy07-12]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-28389; Directorate Identifier 2006-NM-171-AD]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 777-200, -200LR, -300, and
-300ER Series Airplanes

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

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Boeing Model 777-200, -200LR, -300, and -300ER series
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. This
proposed AD also would require the initial performance 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 August 17, 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 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-2007-
28389; Directorate Identifier 2006-NM-171-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

[[Page 36374]]

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 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''
(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 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 777 Maintenance
Planning Data (MPD) Document D622W001-9, Section 9, Revision March 2006
(hereafter referred to as ``Revision March 2006 of the MPD''):
Section D., ``AIRWORTHINESS LIMITATIONS--SYSTEMS, FUEL
SYSTEMS AIRWORTHINESS LIMITATIONS''; and
Section E., ``PAGE FORMAT: SYSTEMS AIRWORTHINESS
LIMITATIONS.''
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 changes 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 AWL 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 performance of certain repetitive inspections specified in
the AWLs to phase in those inspections, 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 AWL 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 AWL revision, operators
would need to do any maintenance on the fuel tank system as specified
in the CDCCLs. Maintenance done before the AWL 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

[[Page 36375]]

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 require only
the AWL 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 AWL
section of the Instructions for Continued Airworthiness by
incorporating certain information specified in Revision March 2006 of
the MPD into the MPD. Paragraph (g) 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 the AWL
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 D. 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 D. 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 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. Operators might wish to use the
appendix 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 E 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
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 E 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 referring to 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 needs to be approved by the
Manager, Seattle ACO, or governing regulatory authority. For example,
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 E 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 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 564 airplanes of the affected design in the
worldwide fleet. This proposed AD would affect about 125 airplanes of
U.S. registry. The following table provides the estimated costs for
U.S. operators to comply with this proposed AD at an average labor rate
of $80 per work hour.

Estimated Costs
------------------------------------------------------------------------
Cost per
Actions Work hours airplane Fleet cost
------------------------------------------------------------------------
Maintenance program revision..... 8 $640 $80,000
Inspections...................... 8 640 80,000
------------------------------------------------------------------------


[[Page 36376]]

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-2007-28389; Directorate Identifier 2006-NM-
171-AD.

Comments Due Date

(a) The FAA must receive comments on this AD action by August
17, 2007.

Affected ADs

(b) None.

Applicability

(c) This AD applies to Boeing Model 777-200, -200LR, -300, and -
300ER series airplanes; certificated in any category; with an
original standard airworthiness certificate or original export
certificate of airworthiness issued before June 1, 2006.

Note 1: Airplanes with an original standard airworthiness
certificate or original export certificate of airworthiness issued
on or after June 1, 2006, must be already in compliance with the
airworthiness limitations specified in this AD because those
limitations were applicable as part of the airworthiness
certification of those airplanes.


Note 2: 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 (AWLs) in the Boeing 777
Maintenance Planning Data (MPD) Document D622W001-9 according to
paragraph (g) or (i), as applicable, 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 777 MPD Document D622W001-9, Revision
March 2006.

Revision of AWLs Section

(g) Before December 16, 2008, revise the AWLs section of the
Instructions for Continued Airworthiness by incorporating the
information in the sections specified in paragraphs (g)(1) and
(g)(2) of this AD into the MPD, except that the initial inspections
specified in paragraph (h) of this AD must be done at the compliance
times specified in paragraph (h) of this AD. 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 D., ``AIRWORTHINESS LIMITATIONS--SYSTEMS, FUEL
SYSTEMS AIRWORTHINESS LIMITATIONS,'' of Revision March 2006 of the
MPD.
(2) Section E., ``PAGE FORMAT: SYSTEMS AIRWORTHINESS
LIMITATIONS,'' of Revision March 2006 of the MPD.

Initial Inspections and Repair

(h) Do the inspections described in paragraphs (h)(1) and (h)(2)
of this AD at the compliance times specified in paragraphs (h)(1)
and (h)(2); in accordance with the AWLs described in Section E.,
``PAGE FORMAT: SYSTEMS AIRWORTHINESS LIMITATIONS,'' of Revision
March 2006 of the MPD. If any discrepancy is found during this
inspection, repair the discrepancy before further flight in
accordance with Revision March 2006 of the MPD. Accomplishing the
actions in accordance with a later revision of the MPD is an
acceptable method of compliance if the revision is approved by the
Manager, Seattle ACO.
(1) At the later of the times specified in paragraphs (h)(1)(i)
and (h)(1)(ii) of this AD, do a detailed inspection of external
wires over the center fuel tank for damaged clamps, wire chafing,
and wire bundles in contact with the surface of the center fuel
tank, and repair any discrepancy; in accordance with 28-AWL-01.
(i) Before the accumulation of 36,000 total flight cycles, or
within 120 months since the date of issuance of the original
standard airworthiness certificate or the date of issuance of the
original export certificate of airworthiness, whichever occurs
first.
(ii) Within 72 months after the effective date of this AD.

Note 3: 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.''

(2) At the later of the times specified in paragraphs (h)(2)(i)
and (h)(2)(ii) of this AD, do a special detailed inspection
(resistance test) of the lightning shield-to-ground termination of
the out tank wiring of the fuel quantity indicating system (FQIS)
and, as applicable, repair (restore) the bond to ensure the shield-
to-ground termination meets specified resistance values; in
accordance with 28-AWL-03.
(i) Before the accumulation of 36,000 total flight cycles, or
within 120 months since the date of issuance of the original
standard

[[Page 36377]]

airworthiness certificate or the date of issuance of the original
export certificate of airworthiness, whichever occurs first.
(ii) Within 24 months after the effective date of this AD.

Note 4: 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) 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.

Appendix 1.--Fuel Tank System Airworthiness Limitations--Applicable Maintenance Manuals
----------------------------------------------------------------------------------------------------------------
ATA Section or CMM
AWL No. ALI/CDCCL document \1\ Task title Task
----------------------------------------------------------------------------------------------------------------
28-AWL-01...................... ALI................ AMM 28-11-00/601.. External Wires 28-11-00-210-801.
Over the Center
Tank--Inspection.
28-AWL-02...................... CDCCL.............. SWPM 20-10-11..... Wiring Assembly
and Installation
Configuration.
28-AWL-03...................... ALI................ AMM 05-55-54/601.. Fuel Quantity 05-55-54-200-801.
Indicator System
(FQIS)--Inspectio
n/Check.
28-AWL-04...................... CDCCL.............. SWPM 20-10-15..... Assemble Shield
Ground Wires.
28-AWL-05...................... CDCCL.............. AMM 28-22-15/401.. Install Fuel Line, 28-22-15-400-802-0
Fitting and 02.
Coupling.
28-AWL-06...................... CDCCL.............. AMM 29-11-60/401.. Install Heat 29-11-60-000-801.
Exchanger.
Bonding 29-11-60-765-801.
Resistances of
the Hydraulic
Tubes for the
Heat Exchanger.
28-AWL-07...................... CDCCL.............. CMM 28-20-42,
revision 7; CMM
28-20-45,
revision 3; CMM
28-20-47,
revision 2; or
subsequent
revisions.
28-AWL-08...................... CDCCL.............. AMM 28-11-06/401.. Install Sump Drain 28-11-06-400-801.
Valve.
28-AWL-09...................... CDCCL.
28-AWL-10...................... CDCCL.............. AMM 28-22-06/401.. Install Override/ 28-22-06-400-801.
Jettison Pump
Motor-Impeller.
Install Override/ 28-22-06-400-802.
Jettison Pump
Housing.
AMM 28-22-05/401.. Install Boost Pump 28-22-05-400-801.
Motor-Impeller.
.................. Install Boost Pump 28-22-05-400-802.
Housing.
28-AWL-11...................... CDCCL.............. SWPM 20-10-11..... Wiring Assembly
and Installation
Configuration.
28-AWL-12...................... CDCCL.............. AMM 28-21-02/401.. Install Refuel 28-21-02-400-801.
Valve.
28-AWL-13...................... CDCCL.............. CMM 28-47-69,
revision 1; CMM
28-47-65,
revision 3; or
subsequent
revisions.
28-AWL-14...................... CDCCL.............. CMM 28-47-58,
revision 4; CMM
28-47-59,
revision 1; CMM
28-47-60,
revision 4; CMM
28-48-03,
revision 2; or
subsequent
revisions.
28-AWL-15...................... CDCCL.............. SWPM 20-14-12..... Repair FQIS Wire
Harness.
AMM 28-41-05/401.. Install FQIS In- 28-41-05-404-801.
Tank Wire Harness.
28-AWL-16...................... CDCCL.............. AMM 28-11-01/401.. Install Main Tank 28-11-01-400-801.
Access Door.
AMM 28-11-02/401.. Install Center 28-11-02-400-801.
Tank Access Door.
AMM 28-11-07/401.. Replace Rubber 28-11-07-900-801.
Door Seal.
AMM 28-11-03/401.. Install Surge Tank 28-11-03-400-801.
Access Door.
AMM 28-13-05/401.. Install Surge Tank 28-13-05-420-801.
Vent Flame
Arrestor.
28-AWL-17...................... CDCCL.............. FIM 28-22-00/201.
28-AWL-18......................
28-AWL-19...................... CDCCL.............. AMM 28-22-02/401.. Install Engine 28-22-02-400-802.
Fuel Spar Valve
Actuator.
AMM 28-22-01/401.. Install Engine 28-22-01-400-803.
Fuel Spar Valve
Adapter/Shaft.
AMM 28-22-03/401.. Install Engine 28-22-03-400-803.
Fuel Crossfeed
Valve Adapter/
Shaft.

[[Page 36378]]


AMM 28-22-04/401.. Install FWD/AFT 28-22-04-400-802.
Fuel Crossfeed
Valve Actuator.
AMM 28-26-01/401.. Install Defuel 28-26-01-400-803.
Valve Adapter/
Shaft.
AMM 28-26-02/401.. Install Defuel 28-26-02-400-802.
Valve Actuator.
AMM 28-31-02/401.. Install Fuel 28-31-02-400-801.
Jettison Nozzle
Valve Adapter/
Shaft.
AMM 28-31-03/401.. Install Fuel 28-31-03-400-801.
Nozzle Valve
Actuator.
AMM 28-31-04/401.. Install Fuel 28-31-04-400-803.
Jettison
Isolation Valve
Adapter/Shaft.
AMM 28-31-05/401.. Install Fuel 28-31-05-400-802.
Jettison
Isolation Valve
Actuator.
28-AWL-20...................... CDCCL.............. CMM 28-20-21.
----------------------------------------------------------------------------------------------------------------
\1\ CMMs per applicable manufacturer.


Issued in Renton, Washington, on June 22, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E7-12835 Filed 7-2-07; 8:45 am]

BILLING CODE 4910-13-P