Rule2021-28133
Airworthiness Directives; The Boeing Company Airplanes
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
December 28, 2021
Effective
February 1, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by significant changes, including new or more restrictive requirements, made to the airworthiness limitations (AWLs) and Critical Design Configuration Control Limitations (CDCCLs) related to fuel tank ignition prevention, the engine fuel suction feed system, and the nitrogen generation system. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 86 Issue 246 (Tuesday, December 28, 2021)</title>
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[Federal Register Volume 86, Number 246 (Tuesday, December 28, 2021)]
[Rules and Regulations]
[Pages 73660-73664]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2021-28133]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0134; Project Identifier AD-2020-01254-T;
Amendment 39-21833; AD 2021-24-12]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain The Boeing Company Model 777 airplanes. This AD was prompted by
significant changes, including new or more restrictive requirements,
made to the airworthiness limitations (AWLs) and Critical Design
Configuration Control Limitations (CDCCLs) related to fuel tank
ignition prevention, the engine fuel suction feed system, and the
nitrogen generation system. This AD requires revising the existing
maintenance or inspection program, as applicable, to incorporate new or
more restrictive airworthiness limitations. The FAA is issuing this AD
to address the unsafe condition on these products.
DATES: This AD is effective February 1, 2022.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of February 1,
2022.
ADDRESSES: For service information identified in this final rule,
contact Boeing Commercial Airplanes, Attention: Contractual & Data
Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA
90740-5600; telephone 562-797-1717; internet <a href="https://www.myboeingfleet.com">https://www.myboeingfleet.com</a>. You may view this service information at the
FAA, Airworthiness Products Section, Operational Safety Branch, 2200
South 216th St., Des Moines, WA. For information on the availability of
this material at the FAA, call 206-231-3195. It is also available at
<a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and locating Docket No.
FAA-2021-0134.
Examining the AD Docket
You may examine the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by
searching for and locating Docket No. FAA-2021-0134; or in person at
Docket Operations between 9 a.m. and 5 p.m., Monday through Friday,
except Federal holidays. The AD docket contains this
[[Page 73661]]
final rule, any comments received, and other information. The address
for Docket Operations is U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Kevin Nguyen, Aerospace Engineer,
Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des
Moines, WA 98198; phone and fax: 206-231-3555; email:
<a href="/cdn-cgi/l/email-protection#a5cec0d3cccb8bcbc2d0dcc0cbe5c3c4c48bc2cad3"><span class="__cf_email__" data-cfemail="3d56584b545313535a484458537d5b5c5c135a524b">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain The Boeing
Company Model 777 airplanes. The NPRM published in the Federal Register
on March 26, 2021 (86 FR 16133). The NPRM was prompted by significant
changes, including new or more restrictive requirements, made to the
AWLs and CDCCLs related to fuel tank ignition prevention, the engine
fuel suction feed system, and the nitrogen generation system. In the
NPRM, the FAA proposed to require revising the existing maintenance or
inspection program, as applicable, to incorporate new or more
restrictive airworthiness limitations. The FAA is issuing this AD to
address ignition sources inside the fuel tanks and the increased
flammability exposure of the center fuel tank caused by latent
failures, alterations, repairs, or maintenance actions, which could
result in a fuel tank explosion and consequent loss of an airplane; and
to address potential loss of engine fuel suction feed capability, which
could result in dual engine flameouts, inability to restart engines,
and consequent forced landing of the airplane.
Discussion of Final Airworthiness Directive
Comments
The FAA received comments from The Air Line Pilots Association,
International (ALPA), and FedEx Express, who supported the NPRM without
change.
The FAA received additional comments from three commenters,
including American Airlines (AAL), Boeing, and United Airlines (UAL).
The following presents the comments received on the NPRM and the FAA's
response to each comment.
Request To Delay Issuance of the NPRM
Boeing requested delay of issuance of the NPRM until updated
service information is available. Boeing stated that the service
information has been updated to Section 9, Airworthiness Limitations
(AWLs) and Certification Maintenance Requirements (CMRs), D622W001-9,
dated February 2021, of Boeing 777-200/200LR/300/300ER/777F Maintenance
Planning Data (MPD) Document, which modified two AWLs that are not
currently mandated by AD 2008-11-13, Amendment 39-15536 (73 FR 30737,
May 29, 2008) (AD 2008-11-13) (which will be terminated by this AD),
and that the AWLs have changed significantly. Boeing commented that
using the latest service information eliminates the need for approval
of an alternative method of compliance (AMOC) for the revised AWLs.
Boeing also stated that the delay of the NPRM should occur after
Section 9, Airworthiness Limitations (AWLs) and Certification
Maintenance Requirements (CMRs), D622W001-9, dated February 2021, of
Boeing 777-200/200LR/300/300ER/777F Maintenance Planning Data (MPD)
Document, has been migrated to an ``SCI [special compliance items]/AWL
document D622W001-9-04.'' Boeing commented that FAA approval and
publication of this document to MyBoeingFleet is anticipated by October
2021. Boeing also commented that the migration of the document will
make the method of compliance more manageable for the FAA, Boeing, and
the operators, and that it will also eliminate the need for an AMOC to
use the ``SCI/AWL document.'' Boeing asked that paragraph (g) of the
proposed AD be revised to the document name and revision date of the
new ``SCI/AWL document'' when approved by the FAA.
The FAA partially agrees with the commenter's request. The FAA
agrees to allow operators the option to use Section 9, Airworthiness
Limitations (AWLs) and Certification Maintenance Requirements (CMRs),
D622W001-9, dated February 2021, of Boeing 777-200/200LR/300/300ER/777F
Maintenance Planning Data (MPD) Document, for the reasons provided
above. The February 2021 revision of Section 9 has significant updates
to AWL 28-AWL-31 and AWL 28-AWL-32 that were included in the November
2019 revision of Section 9 to clarify the applicability of certain wire
harnesses and wire bundles, and certain locations of Teflon sleeving
and wire bundles. Either the November 2019 or February 2021 revision of
Section 9 provides an adequate level of safety. The FAA has revised the
``Related Service Information under 1 CFR part 51'' section of this
final rule and paragraph (g) of this AD accordingly.
In addition, the FAA has revised paragraph (h) of this AD to
clarify certain description headers for 28-AWL-31 and 28-AWL-32 of
Section D, ``Airworthiness Limitations--Systems,'' including
Subsections D.1, D.2, and D.3, of Section 9, Airworthiness Limitations
(AWLs) and Certification Maintenance Requirements (CMRs), D622W001-9,
dated February 2021, of Boeing 777 200/200LR/300/300ER/777F Maintenance
Planning Data (MPD) Document. The FAA has redesigned subsequent
paragraphs accordingly.
Since the SCI/AWL document has not yet been issued, the FAA
disagrees to delay this final rule any further to wait for document
migration. To delay this AD would be inappropriate since the FAA has
determined that an unsafe condition exists and that the actions in this
AD must be done to ensure continued safety. However, if an operator is
unable to accomplish the actions in this AD for whatever reason, it may
request approval of an AMOC under the provisions of paragraph (l)(1) of
this AD. The FAA has not changed this final rule in this regard.
Request for an Exemption for Airplanes in Long-Term Storage
UAL recommended that airplanes in long-term storage be exempt from
the applicable initial compliance times in the proposed AD. UAL also
recommended that the airworthiness limitation instructions (ALI) tasks
in the proposed AD be accomplished at the applicable initial compliance
times after the airplane is returned to service. UAL stated that
paragraph (g) of the proposed AD requires the initial compliance time
for doing the ALI tasks at the times specified in paragraphs (g)(1)
through (10) of the proposed AD. UAL also stated that paragraphs (g)(1)
through (5) of the proposed AD provides the flight cycles or days in
which to do the ALI tasks after the most recent inspection, and
paragraph (g)(6) of the proposed AD requires doing the ALI task within
60 months after the effective date of this AD. UAL commented that due
to varying circumstances, however, many of the affected airplanes are
now in long-term storage.
The FAA disagrees with UAL's recommendation to provide an exemption
for airplanes in long-term storage. While the FAA understands that some
airplanes are currently in long-term storage due to varying
circumstances, it has determined that due to the unsafe condition, the
initial compliance times for doing the ALI tasks represent an adequate
amount of time to accomplish the actions required in this AD. If an
operator is unable to
[[Page 73662]]
accomplish the actions in this AD for whatever reason, it may request
for an approval of an AMOC under the provisions of paragraph (l)(1) of
this AD. The FAA has not changed this AD in this regard.
Request To Remove Unqualified Wire Types
Boeing requested removal of unqualified wire and wire sleeving
types from the list of acceptable wire and wire sleeving types
specified in paragraphs (h)(1) and (2) of the proposed AD. Boeing
stated that it has qualified and certified wire types BMS 13-48, BMS
13-58 and BMS 13-60, and Teflon wire sleeving TFE-2X, and it has not
certified the additional wire and wire sleeving types for Boeing
airplanes specified in paragraphs (h)(1) and (2) of the proposed AD.
The FAA disagrees with the commenter's request. Due to the FAA's
assessment of the critical design features, it has determined that
additional non-Boeing alternative wire types, wire sleeves, and wire
sleeving material, as specified in paragraphs (i)(1) and (2) of this
AD, are acceptable. Since the issuance of AD 2008-11-13 (which is
terminated by this AD), the FAA has received requests for approval of
AMOCs from operators and supplemental type certificate (STC) holders
(or applicants) to allow the installation of alternative wire types,
wire sleeves, and wire sleeving materials. The FAA evaluated certain
attributes of those alternative materials for each installation, and
issued AMOC approvals for AD 2008-11-13 based on its determination that
the installation of those wire types, wire sleeves, and wire sleeving
materials would provide an acceptable level of safety. The FAA has not
changed the AD in this regard.
Request for Clarification of Previously Issued AMOCs
AAL requested clarification of previously issued AMOCs. AAL stated
that for AD 2008-11-13, it currently uses AMOC 784-17-1576 with AWL 28-
AWL-AVDEC and AWL 28-AWL-16, for the installation of STC ST02532LA. AAL
commented that the NPRM specifically stated that credit would not be
granted for AMOCs previously approved under AD 2008-11-13, to which
AMOC 784-17-1576 is applicable.
AAL also commented that the NPRM specifically references operator's
incorporating alternative versions of AWL 28-AWL-11, and that the FAA
determined that certain critical design features specified in the AMOC-
approved versions are not acceptable to meet the intent of AWL 28-AWL-
11. AAL stated that the paragraph reads as though all AMOCs associated
with AD 2008-11-13 are no longer approved; however, AAL uses AMOC 784-
17-1576 to install a series of gaskets that do not require a greasing
component, while AWL 28-AWL-11 is associated with requirements for new
wiring that penetrates the fuel tank wall.
AAL commented that AMOC 784-17-1576 does not affect AWL 28-AWL-11
or its fundamental elements, and that AMOC 784-17-1576 aligns with the
incorporation of AWL 28-AWL-01 through AWL 28-AWL-20, inclusive of
Section 9, Airworthiness Limitations (AWLs) and Certification
Maintenance Requirements (CMRs), D622W001-9, dated November 2019, of
Boeing 777-200/200LR/300/300ER/777F Maintenance Planning Data (MPD)
Document.
The FAA provides the following clarification that was included in
the NPRM for AMOCs previously approved for AD 2008-11-13. The FAA
previously issued AMOC approvals for compliance with paragraph (g)(2)
of AD 2008-11-13 to allow operators to incorporate alternative versions
of AWL 28-AWL-11. For those STCs, the FAA approved alternative versions
of AWL 28-AWL-11 that specified critical design features associated
with STC modifications. The FAA has determined that certain critical
design features specified in the AMOC-approved versions of AWL 28-AWL-
11 are no longer acceptable in meeting the intent of this AWL.
Therefore, this AD does not allow credit for any AMOCs previously
approved under AD 2008-11-13; AMOCs approved under AD 2008-11-13 will
need to be resubmitted for evaluation. If an operator is unable to
accomplish the actions in this AD for whatever reason, it may request
an approval of an AMOC under the provisions of paragraph (l)(1) of this
AD. The FAA has not changed this AD in this regard.
Conclusion
The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. Except for minor editorial changes, and any other changes
described previously, this AD is adopted as proposed in the NPRM. None
of the changes will increase the economic burden on any operator.
Related Service Information Under 1 CFR Part 51
The FAA has reviewed the following service information.
<bullet> Section 9, Airworthiness Limitations (AWLs) and
Certification Maintenance Requirements (CMRs), D622W001-9, dated
November 2019, of Boeing 777-200/200LR/300/300ER/777F Maintenance
Planning Data (MPD) Document.
<bullet> Section 9, Airworthiness Limitations (AWLs) and
Certification Maintenance Requirements (CMRs), D622W001-9, dated
February 2021, of Boeing 777-200/200LR/300/300ER/777F Maintenance
Planning Data (MPD) Document.
This service information describes airworthiness limitations and
CDCCLs tasks related to fuel tank ignition prevention, the engine fuel
suction feed system, and the nitrogen generation system. These
documents are distinct because the February 2021 revision of Section 9
includes updated information. This service information is reasonably
available because the interested parties have access to it through
their normal course of business or by the means identified in
ADDRESSES.
Costs of Compliance
The FAA estimates that this AD affects 219 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
The FAA has determined that revising the existing maintenance or
inspection program takes an average of 90 work-hours per operator,
although the agency recognizes that this number may vary from operator
to operator. Since operators incorporate maintenance or inspection
program changes for their affected fleet(s), the FAA has determined
that a per-operator estimate is more accurate than a per-airplane
estimate. Therefore, the FAA estimates the average total cost per
operator to be $7,650 (90 work-hours x $85 per work-hour).
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.
The FAA is 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
[[Page 73663]]
that authority because it addresses an unsafe condition that is likely
to exist or develop on products identified in this rulemaking action.
Regulatory Findings
This AD will not have federalism implications under Executive Order
13132. This AD will 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 this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, 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.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
The Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
0
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]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2021-24-12 The Boeing Company: Amendment 39-21833; Docket No. FAA-
2021-0134; Project Identifier AD-2020-01254-T.
(a) Effective Date
This airworthiness directive (AD) is effective February 1, 2022.
(b) Affected ADs
This AD affects the ADs specified in paragraphs (b)(1) and (2)
of this AD.
(1) AD 2008-11-13, Amendment 39-15536 (73 FR 30737, May 29,
2008) (AD 2008-11-13).
(2) AD 2014-09-09, Amendment 39-17844 (79 FR 30005, May 27,
2014) (AD 2014-09-09).
(c) Applicability
This AD applies to The Boeing Company Model 777-200, -200LR, -
300, -300ER, and 777F series airplanes, certificated in any
category, having line numbers (L/Ns) 1 through 1609 inclusive.
(d) Subject
Air Transport Association (ATA) of America Code 28, Fuel; 47,
Inert Gas System.
(e) Unsafe Condition
This AD was prompted by significant changes, including new or
more restrictive requirements, made to the airworthiness limitations
(AWLs) and Critical Design Configuration Control Limitations
(CDCCLs) related to fuel tank ignition prevention, the engine fuel
suction feed system, and the nitrogen generation system. The FAA is
issuing this AD to address ignition sources inside the fuel tanks
and the increased flammability exposure of the center fuel tank
caused by latent failures, alterations, repairs, or maintenance
actions, which could result in a fuel tank explosion and consequent
loss of an airplane; and to address potential loss of engine fuel
suction feed capability, which could result in dual engine
flameouts, inability to restart engines, and consequent forced
landing of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Maintenance or Inspection Program Revision
Within 60 days after the effective date of this AD, revise the
existing maintenance or inspection program, as applicable, to
incorporate the information in Section D, ``Airworthiness
Limitations--Systems,'' including Subsections D.1, D.2, and D.3, of
Section 9, Airworthiness Limitations (AWLs) and Certification
Maintenance Requirements (CMRs), D622W001-9, dated November 2019, of
Boeing 777-200/200LR/300/300ER/777F Maintenance Planning Data (MPD)
Document; or Section D, ``Airworthiness Limitations--Systems,''
including Subsections D.1, D.2, and D.3, of Section 9, Airworthiness
Limitations (AWLs) and Certification Maintenance Requirements
(CMRs), D622W001-9, dated February 2021, of Boeing 777-200/200LR/
300/300ER/777F Maintenance Planning Data (MPD) Document; except as
provided by paragraph (h) and (i) of this AD. The initial compliance
time for doing the airworthiness limitation instructions (ALI) tasks
is at the times specified in paragraphs (g)(1) through (10) of this
AD.
(1) For AWL 28-AWL-01, ``External Wires Over Center Fuel Tank'':
Within 16,000 flight cycles or 3,000 days, whichever occurs first
after the date of issuance of the original airworthiness certificate
or the date of issuance of the original export certificate of
airworthiness; or within 16,000 flight cycles or 3,000 days,
whichever occurs first after the most recent inspection was
performed as specified in AWL 28-AWL-01; whichever occurs later.
(2) For AWL 28-AWL-03, ``Fuel Quantity Indicating System
(FQIS)--Out of Tank Wiring Lightning Shield to Ground Termination'':
Within 16,000 flight cycles or 3,000 days, whichever occurs first
after the date of issuance of the original airworthiness certificate
or the date of issuance of the original export certificate of
airworthiness; or within 16,000 flight cycles or 3,000 days,
whichever occurs first after the most recent inspection was
performed as specified in AWL 28-AWL-03; whichever occurs later.
(3) For AWL 28-AWL-18, ``Over-Current and Arcing Protection
Electrical Design Features Operation--AC Fuel Pump GFI and GFP'':
Within 375 days after the date of issuance of the original
airworthiness certificate or the date of issuance of the original
export certificate of airworthiness; or within 375 days after
accomplishment of the actions specified in Boeing Service Bulletin
777-28A0037; or within 375 days after accomplishment of the actions
specified in Boeing Service Bulletin 777-28A0038; or within 375 days
after the most recent inspection was performed as specified in AWL
28-AWL-18; whichever occurs latest.
(4) For AWL 28-AWL-21, ``External Wires Over Auxiliary Fuel Tank
(Cell)'': Within 16,000 flight cycles or 3,000 days, whichever
occurs first after the date of issuance of the original
airworthiness certificate or date of issuance of the original export
certificate of airworthiness; or within 16,000 flight cycles or
3,000 days, whichever occurs first after the most recent inspection
was performed as specified in AWL 28-AWL-21; or within 365 days
after the effective date of this AD; whichever occurs latest.
(5) For AWL 28-AWL-26, ``Auxiliary Fuel Tank (Cell) AC Fuel Pump
Uncommanded ON/Automatic Shutoff Circuit'': Within 375 days after
the date of issuance of the original airworthiness certificate or
the date of issuance of the original export certificate of
airworthiness; or within 375 days after the most recent inspection
was performed as specified in AWL 28-AWL-26; or within 30 days after
the effective date of this AD; whichever occurs latest.
(6) For AWL 28-AWL-32, ``Cushion Clamps and Teflon Sleeving
Installed on Out-of-Tank Wire Bundles Installed on Brackets that are
Mounted Directly on the Fuel Tanks'': For airplanes having L/Ns 1
through 503 inclusive, within 3,750 days after accomplishment of the
actions specified in Boeing Service Bulletins 777-57A0050, or within
60 months after the effective date of this AD, whichever occurs
later. For airplanes having L/Ns 504 and subsequent, within 3,750
days after the date of issuance of the original airworthiness
certificate or the date of issuance of the original export
certificate of airworthiness; or within 60 months after the
effective date of this AD; whichever occurs later.
(7) For AWL 28-AWL-101, ``Engine Fuel Suction Feed Operational
Test'': Within 7,500 flight hours after the date of issuance of the
original airworthiness certificate or the date of issuance of the
original export certificate of airworthiness; or within 7,500 flight
hours after the most recent inspection was performed as specified in
AWL 28-AWL-101; whichever occurs later.
(8) For AWL 47-AWL-04, ``NGS--Thermal Switch'': Within 108,000
flight hours after the date of issuance of the original
airworthiness certificate or the date of issuance of the original
export certificate of
[[Page 73664]]
airworthiness; or within 108,000 flight hours after accomplishment
of the actions specified in Boeing Service Bulletin 777-47-0002; or
within 108,000 flight hours after the most recent inspection was
performed as specified in AWL 47-AWL-04; whichever occurs latest.
(9) For AWL 47-AWL-05, ``NGS--Cross Vent Check Valve'': Within
10,682 flight hours after the date of issuance of the original
airworthiness certificate or the date of issuance of the original
export certificate of airworthiness; or within 10,682 flight hours
after accomplishment of the actions specified in Boeing Service
Bulletin 777-47-0002; or within 10,682 flight hours after the most
recent inspection was performed as specified in AWL 47-AWL-05;
whichever occurs latest.
(10) For AWL 47-AWL-06, ``NGS--NEA Distribution Ducting
Integrity'': Within 10,682 flight hours after the date of issuance
of the original airworthiness certificate or the date of issuance of
the original export certificate of airworthiness; or within 10,682
flight hours after accomplishment of the actions specified in Boeing
Service Bulletin 777-47-0002; or within 10,682 flight hours after
the most recent inspection was performed as specified in AWL 47-AWL-
06; whichever occurs latest.
(h) Exceptions to February 2021 Revision of Section 9
The following exceptions apply to 28-AWL-31 and 28-AWL-32 of
Section D, ``Airworthiness Limitations--Systems,'' including
Subsections D.1, D.2, and D.3, of Section 9, Airworthiness
Limitations (AWLs) and Certification Maintenance Requirements
(CMRs), D622W001-9, dated February 2021, of Boeing 777-200/200LR/
300/300ER/777F Maintenance Planning Data (MPD) Document.
(1) In paragraph 1.i., change ``Front Spar Bulkhead (Center
Tank)'' to ``Front Spar Bulkhead (Center Wing Tank Fuel Quantity
Greater than 12,400 Gallons).''
(2) In paragraph 1.j., change ``Rear Spar Bulkhead (Center
Tank)'' to ``Rear Spar Bulkhead (Center Wing Tank Fuel Quantity
Greater than 12,400 Gallons).''
(i) Additional Acceptable Wire Types and Sleeving
As an option, when accomplishing the actions required by
paragraph (g) of this AD, the changes specified in paragraphs (i)(1)
and (2) of this AD are acceptable.
(1) Where AWL 28-AWL-11 identifies wire types BMS 13-48, BMS 13-
58, and BMS 13-60, the following wire types are acceptable: MIL-W-
22759/16, SAE AS22759/16 (M22759/16), MIL-W-22759/32, SAE AS22759/32
(M22759/32), MIL-W-22759/34, SAE AS22759/34 (M22759/34), MIL-W-
22759/41, SAE AS22759/41 (M22759/41), MIL-W-22759/86, SAE AS22759/86
(M22759/86), MIL-W-22759/87, SAE AS22759/87 (M22759/87), MIL-W-
22759/92, and SAE AS22759/92 (M22759/92); and MIL-C-27500 and NEMA
WC 27500 cables constructed from these military or SAE specification
wire types, as applicable.
(2) Where AWL 28-AWL-11 identifies TFE-2X Standard wall
(manufactured as specified in MIL-I-23053) for wire sleeving, the
following sleeving materials are acceptable: Roundit 2000NX and
Varglas Type HO, HP, or HM.
(j) No Alternative Actions, Intervals, or Critical Design Configuration
Control Limitations (CDCCLs)
After the existing maintenance or inspection program has been
revised as required by paragraph (g) of this AD, no alternative
actions (e.g., inspections), intervals, or CDCCLs may be used unless
the actions, intervals, and CDCCLs are approved as an alternative
method of compliance (AMOC) in accordance with the procedures
specified in paragraph (l) of this AD.
(k) Terminating Actions
Accomplishment of the revision required by paragraph (g) of this
AD terminates the requirements specified in paragraphs (k)(1) and
(2) of this AD for that airplane.
(1) All requirements of AD 2008-11-13 for Model 777-200, -200LR,
-300, and -300ER series airplanes only.
(2) All requirements of AD 2014-09-09.
(l) Alternative Methods of Compliance (AMOCs)
(1) The Manager, Seattle ACO Branch, FAA, has the authority to
approve AMOCs for this AD, if requested using the procedures found
in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request
to your principal inspector or responsible Flight Standards Office,
as appropriate. If sending information directly to the manager of
the certification office, send it to the attention of the person
identified in paragraph (m) of this AD. Information may be emailed
to: <a href="/cdn-cgi/l/email-protection#152c38545b5838467074616179703854565a3854585a56384770646070666166557374743b727a63"><span class="__cf_email__" data-cfemail="c9f0e4888784e49aaca8bdbda5ace4888a86e48884868ae49bacb8bcacbabdba89afa8a8e7aea6bf">[email protected]</span></a>.
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the responsible Flight Standards Office.
(3) An AMOC that provides an acceptable level of safety may be
used for any repair, modification, or alteration required by this AD
if it is approved by The Boeing Company Organization Designation
Authorization (ODA) that has been authorized by the Manager, Seattle
ACO Branch, FAA, to make those findings. To be approved, the repair
method, modification deviation, or alteration deviation must meet
the certification basis of the airplane, and the approval must
specifically refer to this AD.
(m) Related Information
For more information about this AD, contact Kevin Nguyen,
Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch,
2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-231-
3555; email: <a href="/cdn-cgi/l/email-protection#58333d2e313676363f2d213d36183e3939763f372e"><span class="__cf_email__" data-cfemail="f09b9586999ede9e978589959eb0969191de979f86">[email protected]</span></a>.
(n) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) of the service information listed
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do
the actions required by this AD, unless the AD specifies otherwise.
(i) Section 9, Airworthiness Limitations (AWLs) and
Certification Maintenance Requirements (CMRs), D622W001-9, dated
November 2019, of Boeing 777-200/200LR/300/300ER/777F Maintenance
Planning Data (MPD) Document.
(ii) Section 9, Airworthiness Limitations (AWLs) and
Certification Maintenance Requirements (CMRs), D622W001-9, dated
February 2021, of Boeing 777-200/200LR/300/300ER/777F Maintenance
Planning Data (MPD) Document.
(3) For service information identified in this AD, contact
Boeing Commercial Airplanes, Attention: Contractual & Data Services
(C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-
5600; telephone 562-797-1717; internet <a href="https://www.myboeingfleet.com">https://www.myboeingfleet.com</a>.
(4) You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200
South 216th St., Des Moines, WA. For information on the availability
of this material at the FAA, call 206-231-3195.
(5) You may view this service information that is incorporated
by reference at the National Archives and Records Administration
(NARA). For information on the availability of this material at
NARA, <a href="/cdn-cgi/l/email-protection#680e1a4601061b180d0b1c0107062806091a09460f071e"><span class="__cf_email__" data-cfemail="1472663a7d7a67647177607d7b7a547a7566753a737b62">[email protected]</span></a>, or go to: <a href="https://www.archives.gov/federal-register/cfr/ibr-locations.html">https://www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued on November 16, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2021-28133 Filed 12-27-21; 8:45 am]
BILLING CODE 4910-13-P
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</html>Indexed from Federal Register on December 28, 2021.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.