Proposed Rule2022-23901
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
November 4, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for all The Boeing Company Model 747-400, -400D, and -400F series airplanes. This proposed AD was prompted by the FAA's analysis of the Model 747 airplane fuel system reviews conducted by the manufacturer, and by the determination that new or more restrictive airworthiness limitations are necessary. This proposed AD would require revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 87 Issue 213 (Friday, November 4, 2022)</title>
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[Federal Register Volume 87, Number 213 (Friday, November 4, 2022)]
[Proposed Rules]
[Pages 66615-66619]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-23901]
[[Page 66615]]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-1170; Project Identifier AD-2022-00023-T]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for all The Boeing Company Model 747-400, -400D, and -400F series
airplanes. This proposed AD was prompted by the FAA's analysis of the
Model 747 airplane fuel system reviews conducted by the manufacturer,
and by the determination that new or more restrictive airworthiness
limitations are necessary. This proposed AD would require revising the
existing maintenance or inspection program, as applicable, to
incorporate new or more restrictive airworthiness limitations. The FAA
is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by December
19, 2022.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
<bullet> Federal eRulemaking Portal: Go to <a href="http://regulations.gov">regulations.gov</a>. Follow
the instructions for submitting comments.
<bullet> Fax: 202-493-2251.
<bullet> 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.
<bullet> Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, 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="http://myboeingfleet.com">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="http://regulations.gov">regulations.gov</a> by searching for and
locating Docket No. FAA-2022-1170.
Examining the AD Docket
You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> by searching for
and locating Docket No. FAA-2022-1170; 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 NPRM, any comments
received, and other information. The street address for Docket
Operations is listed above.
FOR FURTHER INFORMATION CONTACT: Samuel Dorsey, Aerospace Engineer,
Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des
Moines, WA 98198; phone: 206-231-3415; email: <a href="/cdn-cgi/l/email-protection#84d7e5e9f1e1e8aaceaac0ebf6f7e1fdc4e2e5e5aae3ebf2"><span class="__cf_email__" data-cfemail="1a497b776f7f763450345e7568697f635a7c7b7b347d756c">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under ADDRESSES. Include ``Docket No. FAA-2022-1170; Project Identifier
AD-2022-00023-T'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
this proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
<a href="http://regulations.gov">regulations.gov</a>, including any personal information you provide. The
agency will also post a report summarizing each substantive verbal
contact received about this NPRM.
Confidential Business Information
CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to
Samuel Dorsey, Aerospace Engineer, Propulsion Section, FAA, Seattle ACO
Branch, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-
3415; email: <a href="/cdn-cgi/l/email-protection#c497a5a9b1a1a8ea8eea80abb6b7a1bd84a2a5a5eaa3abb2"><span class="__cf_email__" data-cfemail="792a18140c1c155733573d160b0a1c00391f1818571e160f">[email protected]</span></a>. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in
the public docket for this rulemaking.
Background
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, the FAA issued a
final rule 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 that rule
included Amendment 21-78, which established Special Federal Aviation
Regulation No. 88 (SFAR 88) at 14 CFR part 21. Subsequently, SFAR 88
was amended by Amendment 21-82 (67 FR 57490, September 10, 2002;
corrected at 67 FR 70809, November 26, 2002), Amendment 21-83 (67 FR
72830, December 9, 2002; corrected at 68 FR 37735, June 25, 2003, to
change ``21-82'' to ``21-83''), and Amendment 21-101 (83 FR 9162, March
5, 2018).
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 final rule published on
May 7, 2001, the FAA 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, the FAA has established four
criteria intended to define the unsafe conditions associated with fuel
tank systems that
[[Page 66616]]
require corrective actions. The percentage of operating time during
which fuel tanks are exposed to flammable conditions is one of these
criteria. The other three criteria address the failure types under
evaluation: single failures, single failures in combination with
another latent condition(s), and in-service failure experience. For all
four criteria, the evaluations included consideration of previous
actions taken that may mitigate the need for further action.
This proposed AD was prompted by significant changes made to the
airworthiness limitations (AWLs) related to fuel tank ignition
prevention and the nitrogen generation system. This condition, if not
addressed, could result in 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.
FAA's Determination
The FAA is issuing this NPRM after determining that the unsafe
condition described previously is likely to exist or develop on other
products of the same type design.
Related ADs
The FAA issued AD 2008-10-06 R1, Amendment 39-16160 (75 FR 906,
January 7, 2010), which applies to certain Model 747-400, -400D, and -
400F series airplanes. AD 2008-10-06 R1 requires revising the existing
maintenance program by incorporating new airworthiness limitations
(AWLs) for fuel tank systems to satisfy SFAR 88 requirements. That AD
also requires the phasing in of certain repetitive AWL inspections, and
repair if necessary. AD 2008-10-06 R1 was prompted by the FAA's
analysis of the fuel system reviews of Model 747 airplanes conducted by
the manufacturer.
This proposed AD also affects the following ADs, which include
requirements to incorporate certain airworthiness limitations into the
existing maintenance or inspection program. Revising the existing
maintenance or inspection program specified in this proposed AD would
terminate certain actions specified in these ADs:
<bullet> AD 2008-18-09, Amendment 39-15666 (73 FR 52911, September
12, 2008), which applies to certain Model 747-100, 747-100B, 747-100B
SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-
400F, 747SR, and 747SP series airplanes.
<bullet> AD 2010-13-12, Amendment 39-16343 (75 FR 37997, July 1,
2010), which applies to certain Model 747-100, 747-100B, 747-100B SUD,
747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F,
747SR, and 747SP series airplanes.
<bullet> AD 2010-14-08, Amendment 39-16353 (75 FR 38397, July 2,
2010), which applies to certain Model 747-400, -400D, and -400F series
airplanes.
<bullet> AD 2011-06-03, Amendment 39-16627 (76 FR 15814, March 22,
2011), which applies to certain Model 747-100, 747-100B, 747-100B SUD,
747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F,
747SR, and 747SP series airplanes.
<bullet> AD 2014-15-14, Amendment 39-17916 (79 FR 45324, August 5,
2014), which applies to certain Model 747-100, 747-100B, 747-100B SUD,
747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F,
747SR, and 747SP series airplanes.
<bullet> AD 2016-19-03, Amendment 39-18652 (81 FR 65872, September
26, 2016), which applies to certain Model 747-100, 747-100B, 747-100B
SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-
400F, 747SR, and 747SP series airplanes.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Section 9, Airworthiness Limitations (AWLs) and
Certification Maintenance Requirements (CMRs), of Boeing 747-400
Maintenance Planning Data (MPD) Document, D621U400-9, dated September
2021. This service information specifies airworthiness limitations for
fuel tank systems. 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.
Proposed AD Requirements in This NPRM
This proposed AD would require revising the existing maintenance or
inspection program, as applicable, to incorporate new or more
restrictive airworthiness limitations. For information on the
procedures and compliance times, see this service information at
<a href="http://regulations.gov">regulations.gov</a> by searching for and locating Docket No. FAA-2022-1170.
This proposed AD would require revisions to certain operator
maintenance documents to include new actions (e.g., inspections) and
Critical Design Configuration Control Limitations (CDCCLs). Compliance
with these actions and CDCCLs is required by 14 CFR 91.403(c). For
airplanes that have been previously modified, altered, or repaired in
the areas addressed by this proposed AD, the operator may not be able
to accomplish the actions described in the revisions. In this
situation, to comply with 14 CFR 91.403(c), the operator must request
approval for an alternative method of compliance according to paragraph
(k) of this proposed AD.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 119 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed 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 that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.
Regulatory Findings
The FAA 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
[[Page 66617]]
responsibilities among the various levels of government.
For the reasons discussed above, I certify this proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would 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 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
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:
The Boeing Company: Docket No. FAA-2022-1170; Project Identifier AD-
2022-00023-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by December 19, 2022.
(b) Affected ADs
This AD affects the ADs specified in paragraphs (b)(1) through
(7) of this AD.
(1) AD 2008-10-06 R1, Amendment 39-16160 (75 FR 906, January 7,
2010) (AD 2008-10-06 R1).
(2) AD 2008-18-09, Amendment 39-15666 (73 FR 52911, September
12, 2008) (AD 2008-18-09).
(3) AD 2010-13-12, Amendment 39-16343 (75 FR 37997, July 1,
2010) (AD 2010-13-12).
(4) AD 2010-14-08, Amendment 39-16353 (75 FR 38397, July 2,
2010) (AD 2010-14-08).
(5) AD 2011-06-03, Amendment 39-16627 (76 FR 15814, March 22,
2011) (AD 2011-06-03).
(6) AD 2014-15-14, Amendment 39-17916 (79 FR 45324, August 5,
2014) (AD 2014-15-14).
(7) AD 2016-19-03, Amendment 39-18652 (81 FR 65872, September
26, 2016) (AD 2016-19-03).
(c) Applicability
This AD applies to all The Boeing Company Model 747-400, -400D,
and -400F series airplanes, certificated in any category.
(d) Subject
Air Transport Association (ATA) of America Code 28, Fuel.
(e) Unsafe Condition
This AD was prompted by the FAA's analysis of the fuel system
reviews on Model 747-400, -400D, and -400F series airplanes
conducted by the manufacturer, and by the determination that new or
more restrictive airworthiness limitations are necessary. The FAA is
issuing this AD to reduce the potential of ignition sources inside
fuel tanks, which, in combination with flammable fuel vapors, could
result in fuel tank explosions and consequent loss 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 specified in Section B, Airworthiness
Limitations--Systems, of Section 9, Airworthiness Limitations (AWLs)
and Certification Maintenance Requirements (CMRs), of Boeing 747-400
Maintenance Planning Data (MPD) Document, D621U400-9, dated
September 2021; except as provided by paragraph (h) of this AD. The
initial compliance time for doing the airworthiness limitation
instruction (ALI) tasks is at the times specified in paragraphs
(g)(1) through (13) of this AD.
(1) For AWL No. 28-AWL-01, ``External Wires Over Center Fuel
Tank'': At the applicable time specified in paragraph (g)(1)(i) or
(ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-01 in their maintenance or inspection program before the
effective date of this AD: Within 144 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 12 months after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(1)(i) of this
AD: Within 144 months since AWL No. 28-AWL-01 was added to the
maintenance or inspection program, or within 144 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
01, whichever occurs later.
(2) For AWL No. 28-AWL-03, ``Fuel Quantity Indication System
(FQIS)--Out of Tank Wiring Lightning Shield to Ground Termination'':
At the applicable time specified in paragraph (g)(2)(i) or (ii) of
this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-03 in their maintenance or inspection program before the
effective date of this AD: Within 144 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 12 months after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(2)(i) of this
AD: Within 144 months since AWL No. 28-AWL-03 was added to the
maintenance or inspection program, or within 144 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
03, whichever occurs later.
(3) For AWL No. 28-AWL-10, ``Main Tank, Center Wing Tank, and
Horizontal Stabilizer Tank (if installed) Refuel Valve
Installation--Fault Current Bond'': At the applicable time specified
in paragraph (g)(3)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-10 in their maintenance or inspection program before the
effective date of this AD: Within 144 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 12 months after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(3)(i) of this
AD: Within 144 months since AWL No. 28-AWL-10 was added to the
maintenance or inspection program, or within 144 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
10, whichever occurs later.
(4) For AWL No. 28-AWL-17, ``Over-Current and Arcing Protection
Electrical Design Features Operation--Fault Current Detector (FCD)
for Center Wing Tank (CWT) Pumps and Inboard Main Tank Override/
Jettison (O/J) Pumps and Horizontal Stabilizer Tank (HST) Transfer
Fuel Pumps'': At the applicable time specified in paragraph
(g)(4)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-17 in their maintenance or inspection program before the
effective date of this AD: Within 18 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 90 days after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(4)(i) of this
AD: Within 18 months since AWL No. 28-AWL-17 was added to the
maintenance or inspection program, or within 18 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
17, whichever occurs later.
(5) For AWL No. 28-AWL-24, ``Horizontal Stabilizer Tank (HST)
Fuel Pump Automatic Shutoff Circuit (If Installed)'': At the
applicable time specified in paragraph (g)(5)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-24 in their maintenance or inspection program before the
effective date of this AD: Within 12 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 90 days after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(5)(i) of this
AD: Within 12 months since AWL No. 28-AWL-24 was added to the
maintenance or inspection program, or within 12 months after the
most
[[Page 66618]]
recent inspection was performed as specified in AWL No. 28-AWL-24,
whichever occurs later.
(6) For AWL No. 28-AWL-26, ``Main Tank 2 and Main Tank 3
Override/Jettison Fuel Pump Uncommanded on System'': At the
applicable time specified in paragraph (g)(6)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-26 in their maintenance or inspection program before the
effective date of this AD: Within 12 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 90 days after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(6)(i) of this
AD: Within 12 months since AWL No. 28-AWL-26 was added to the
maintenance or inspection program, or within 12 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
26, whichever occurs later.
(7) For AWL No. 28-AWL-28, ``Over-Current and Arcing Protection
Electrical Design Features Operation--Main Tank AC Fuel Pump Ground
Fault Interrupter (GFI)'': At the applicable time specified in
paragraph (g)(7)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-28 in their maintenance or inspection program before the
effective date of this AD: Within 12 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 90 days after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(7)(i) of this
AD: Within 12 months since AWL No. 28-AWL-28 was added to the
maintenance or inspection program, or within 12 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
28, whichever occurs later.
(8) For AWL No. 28-AWL-29, ``Over-Current and Arcing Protection
Electrical Design Features Operation--Center Tank Scavenge AC Fuel
Pump Ground Fault Interrupter (GFI)'': At the applicable time
specified in paragraph (g)(8)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-29 in their maintenance or inspection program before the
effective date of this AD: Within 12 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 90 days after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(8)(i) of this
AD: Within 12 months since AWL No. 28-AWL-29 was added to the
maintenance or inspection program, or within 12 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
29, whichever occurs later.
(9) For AWL No. 28-AWL-33, ``Cushion Clamps and Teflon Sleeving
Installed on Out-of-Tank Wire Bundles Installed on Brackets that are
Mounted Directly on the Fuel Tanks,'' at the applicable time
specified in paragraph (g)(9)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-33 in their maintenance or inspection program before the
effective date of this AD: Within 144 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 12 months after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(9)(i) of this
AD: Within 144 months since AWL No. 28-AWL-33 was added to the
maintenance or inspection program, or within 144 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
33, whichever occurs later.
(10) For AWL No. 28-AWL-40, ``Reserve Tank Refuel Valve
Installation--Lightning Protection Electrical Bond,'' at the
applicable time specified in paragraph (g)(10)(i) or (ii) of this
AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-40 in their maintenance or inspection program before the
effective date of this AD: Within 72 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, or within 12 months after the effective date of this
AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(10)(i) of
this AD: Within 72 months since AWL No. 28-AWL-40 was added to the
maintenance or inspection program, or within 72 months after the
most recent inspection was performed as specified in AWL No. 28-AWL-
40, whichever occurs later.
(11) For AWL No. 47-AWL-07, ``Nitrogen Generation System--
Nitrogen Enriched Air (NEA) Distribution Ducting Inspection,'' at
the applicable time specified in paragraph (g)(11)(i) or (ii) of
this AD.
(i) For airplanes that did not have any version of AWL No. 47-
AWL-07 in their maintenance or inspection program before the
effective date of this AD: Within 21,250 total flight hours since
issuance of the original airworthiness certificate or original
export certificate of airworthiness, or within 4 months after the
effective date of this AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(11)(i) of
this AD: Within 21,250 total flight hours since AWL No. 47-AWL-07
was added to the maintenance or inspection program, or within 21,250
total flight hours after the most recent inspection was performed as
specified in AWL No. 47-AWL-07, whichever occurs later.
(12) For AWL No. 47-AWL-08, ``Nitrogen Generation System [NGS]--
Cross-Vent Check Valve Functional Check,'' at the applicable time
specified in paragraph (g)(12)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 47-
AWL-08 in their maintenance or inspection program before the
effective date of this AD: Within 21,250 total flight hours since
issuance of the original airworthiness certificate or original
export certificate of airworthiness, or within 4 months after the
effective date of this AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(12)(i) of
this AD: Within 21,250 total flight hours since AWL No. 47-AWL-08
was added to the maintenance or inspection program, or within 21,250
total flight hours after the most recent inspection was performed as
specified in AWL No. 47-AWL-08, whichever occurs later.
(13) For AWL No. 47-AWL-10, ``NGS--Thermal Switch,'' at the
applicable time specified in paragraph (g)(13)(i) or (ii) of this
AD.
(i) For airplanes that did not have any version of AWL No. 47-
AWL-10 in their maintenance or inspection program before the
effective date of this AD: Within 54,000 total flight hours since
issuance of the original airworthiness certificate or original
export certificate of airworthiness, or within 4 months after the
effective date of this AD, whichever occurs later.
(ii) For airplanes not identified in paragraph (g)(13)(i) of
this AD: Within 54,000 total flight hours since AWL No. 47-AWL-10
was added to the maintenance or inspection program, or within 54,000
total flight hours after the most recent inspection was performed as
specified in AWL No. 47-AWL-10, whichever occurs later.
(h) Additional Acceptable Wire Types and Sleeving
As an option, during accomplishment of the actions required by
paragraph (g) of this AD, the alternative materials specified in
paragraphs (h)(1) and (2) of this AD are acceptable.
(1) Where AWL No. 28-AWL-08 identifies wire types BMS 13-48, BMS
13-58, and BMS 13-60, the following wire types, as applicable, 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.
(2) Where AWL No. 28-AWL-08 identifies TFE-2X Standard wall for
wire sleeving, the following sleeving materials are acceptable:
Roundit 2000NX and Varglas Type HO, HP, or HM, as applicable.
(i) 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 (k) of this AD.
(j) Terminating Actions
(1) Accomplishing the actions required by paragraph (g) of this
AD terminates all requirements of AD 2008-10-06 R1.
(2) Accomplishing the actions required by paragraph (g) of this
AD terminates paragraph
[[Page 66619]]
(g)(2) of AD 2008-18-09 for Model 747-400, -400D, and -400F
airplanes only.
(3) Accomplishing the actions required by paragraph (g) of this
AD terminates paragraph (h)(1) of AD 2010-13-12 for Model 747-400, -
400D, and -400F airplanes only.
(4) Accomplishing the actions required by this AD terminates
paragraph (j) of AD 2010-14-08.
(5) Accomplishing the actions required by paragraph (g) of this
AD terminates paragraph (l) of AD 2011-06-03 for Model 747-400, -
400D, and -400F airplanes only.
(6) Accomplishing the actions required by paragraph (g) of this
AD terminates paragraph (h)(1) of AD 2014-15-14 for Model 747-400, -
400D, and -400F airplanes only.
(7) Accomplishing the actions required by paragraph (g) of this
AD terminates paragraph (h) of AD 2016-19-03 for Model 747-400, -
400D, and -400F airplanes only.
(k) 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 (l)(1) of this AD. Information may be
emailed to: <a href="/cdn-cgi/l/email-protection#182135595655354b7d796c6c747d35595b57355955575b354a7d696d7d6b6c6b587e7979367f776e"><span class="__cf_email__" data-cfemail="764f5b37383b5b25131702021a135b3735395b373b39355b24130703130502053610171758111900">[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.
(l) Related Information
(1) For more information about this AD, contact Samuel Dorsey,
Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch,
2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3415;
email: <a href="/cdn-cgi/l/email-protection#bbe8dad6ceded795f195ffd4c9c8dec2fbdddada95dcd4cd"><span class="__cf_email__" data-cfemail="1f4c7e726a7a733155315b706d6c7a665f797e7e31787069">[email protected]</span></a>.
(2) 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="http://myboeingfleet.com">myboeingfleet.com</a>. You may
view this referenced 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.
Issued on September 19, 2022.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2022-23901 Filed 11-3-22; 8:45 am]
BILLING CODE 4910-13-P
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</html>Indexed from Federal Register on November 4, 2022.
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.