Document ID: FAA-2022-0520-0001
Agency: faa
Document Type: Proposed Rule
Title: Airworthiness Directives: The Boeing Company Airplanes
Posted Date: 2022-06-02T04:00Z

[Federal Register Volume 87, Number 106 (Thursday, June 2, 2022)]
[Proposed Rules]
[Pages 33451-33454]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-11750]

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

  Federal Register / Vol. 87, No. 106 / Thursday, June 2, 2022 / 
Proposed Rules  

[[Page 33451]]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0520; Project Identifier AD-2021-00683-T]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for all The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-
200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP series airplanes. 
This proposed AD was prompted by significant changes, including new or 
more restrictive requirements, made to the airworthiness limitations 
(AWLs) related to fuel tank ignition prevention. This proposed AD would 
require revising the existing maintenance or inspection program, as 
applicable, to incorporate the latest revision of the AWLs. 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 July 18, 
2022.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     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.
     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; phone: 
562-797-1717; internet: https://www.myboeingfleet.com. 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.

Examining the AD Docket

    You may examine the AD docket at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2022-0520; 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: Rose Len, Aerospace Engineer, 
Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des 
Moines, WA 98198; phone and fax: 206-231-3604; email: [email protected].

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-2022-0520; Project Identifier 
AD-2021-00683-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 
https://www.regulations.gov, 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 Rose 
Len, Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch, 
2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-231-
3604; email: [email protected]. Any commentary that the FAA receives 
that 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).

[[Page 33452]]

    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 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 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, combination of 
failures, and unacceptable (failure) experience. For all three 
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, including new 
or more restrictive requirements, made to the AWL related to fuel tank 
ignition prevention. 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 a fuel tank 
explosion and consequent loss of the airplane.

FAA's Determination

    The FAA is proposing this AD because the agency evaluated all the 
relevant information and determined the unsafe condition described 
previously is likely to exist or develop in other products of the same 
type design.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Boeing 747-100/200/300/SP/SR Airworthiness 
Limitations (AWLs) and Certification Maintenance Requirements (CMRs), 
D6-13747-CMR, dated September 2020. This service information describes 
AWLs that include airworthiness limitation instructions (ALIs) and 
critical design configuration control limitations (CDCCLs) tasks 
related to fuel tank ignition prevention. 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 the latest revision 
of the AWLs.
    This proposed AD would require revisions to certain operator 
maintenance documents to include new actions (e.g., inspections) and 
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 (l) of this proposed AD.

Other Relevant Rulemaking

    The proposed revisions will affect several existing AWL provisions 
in various ADs. The FAA has determined that accomplishing the revision 
required by paragraph (g) of this proposed AD would terminate the 
following AWL requirements for that airplane:
     The revision required by paragraphs (g) and (h) of AD 
2008-10-07 R1, Amendment 39-16070 (74 FR 56098, October 30, 2009).
     The revision required by paragraph (g)(1) of AD 2008-18-
09, Amendment 39-15666 (73 FR 52911, September 12, 2008).
     The revision required by paragraph (h)(2) of AD 2010-13-
12, Amendment 39-16343 (75 FR 37997, July 1, 2010).
     The revision required by paragraph (h) of AD 2010-24-13, 
Amendment 39-16532 (75 FR 78591, December 16, 2010; corrected May 25, 
2011 (76 FR 30253)).
     The revision required by paragraph (k) of AD 2011-06-03, 
Amendment 39-16627 (76 FR 15814, March 22, 2011).
     The revision required by paragraph (h)(2) of AD 2014-15-
14, Amendment 39-17916 (79 FR 45324, August 5, 2014).
     The revision required by paragraph (h) of AD 2016-19-03, 
Amendment 39-18652 (81 FR 65872, September 26, 2016).

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 39 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 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.

[[Page 33453]]

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-2022-0520; Project Identifier 
AD-2021-00683-T.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by July 18, 2022.

(b) Affected ADs

    This AD affects the ADs specified in paragraphs (b)(1) through 
(7) of this AD.
    (1) AD 2008-10-07 R1, Amendment 39-16070 (74 FR 56098, October 
30, 2009) (AD 2008-10-07 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 2010-24-13, Amendment 39-16532 (75 FR 78591, December 16, 
2010; corrected May 25, 2011 (76 FR 30253)) (AD 2010-24-13).
    (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 747-100, 747-
100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, 
and 747SP 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 significant changes, including new or 
more restrictive requirements, made to the airworthiness limitations 
(AWLs) related to fuel tank ignition prevention. The FAA is issuing 
this AD to address the potential for ignition sources inside fuel 
tanks caused by latent failures, alterations, repairs, or 
maintenance actions, which, in combination with flammable fuel 
vapors, could result in a fuel tank explosion and consequent loss of 
the airplane.

(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 Boeing 747-100/200/300/SP/
SR Airworthiness Limitations (AWLs) and Certification Maintenance 
Requirements (CMRs), D6-13747-CMR, dated September 2020, except as 
specified in paragraphs (h) and (i) of this AD. The initial 
compliance times for the airworthiness limitation instruction (ALI) 
tasks are within the applicable compliance times for each AWL number 
specified in paragraphs (g)(1) through (8) 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 the existing 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, 
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 incorporated into 
the existing 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 28-AWL-03, ``Fuel Quantity Indicating System (FQIS)--Out 
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 the existing 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 incorporated into 
the existing 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 28-AWL-09, ``Over-Current and Arcing Protection 
Electrical Design Features Operation--Fault Current Detector for 
Center Tank Override/Jettison (O/J) Pumps'': 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-09 in the existing 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)(3)(i) of this 
AD: Within 18 months since AWL No. 28-AWL-09 was incorporated into 
the existing maintenance or inspection program, or within 18 months 
after the most recent inspection was performed as specified in AWL 
No. 28-AWL-09, whichever occurs later.
    (4) For AWL No. 28-AWL-13, ``Main Tank, Center Wing Tank, Body 
Tank (if installed), and Auxiliary Tank (if installed) Refuel Valve 
Installation--Fault Current Bond'': 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-13 in the existing 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)(4)(i) of this 
AD: Within 144 months since AWL No. 28-AWL-13 was incorporated into 
the existing maintenance or inspection program, or within 144 months 
after the most recent inspection was performed as specified in AWL 
No. 28-AWL-13, whichever occurs later.
    (5) For AWL No. 28-AWL-22, ``Center Tank Override/Jettison Fuel 
Pump Inlet Protection and Power Failed On Protection System'': 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-22 in the existing 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-22 was incorporated into 
the existing maintenance or inspection program, or within 12 months 
after the most recent inspection was performed as specified in AWL 
No. 28-AWL-22, whichever occurs later.
    (6) For AWL No. 28-AWL-23, ``Over-Current and Arcing Protection 
Electrical Design Features Operation--Main Tank AC Fuel Pump and 
Center Tank Scavenge AC Fuel Pump Ground Fault Interrupter (GFI)'': 
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-23 in the existing 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, within 12 months

[[Page 33454]]

since Boeing Service Bulletin 747-28A2261 was incorporated, or 
within 90 days after the effective date of this AD, whichever occurs 
latest.
    (ii) For airplanes not identified in paragraph (g)(6)(i) of this 
AD: Within 12 months since AWL No. 28-AWL-23 was incorporated into 
the existing maintenance or inspection program, or within 12 months 
after the most recent inspection was performed as specified in AWL 
No. 28-AWL-23, whichever occurs later.
    (7) For AWL No. 28-AWL-25, ``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)(7)(i) or (ii) of this AD.
    (i) For airplanes that did not have any version of AWL No. 28-
AWL-25 in the existing 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)(7)(i) of this 
AD: Within 144 months since AWL No. 28-AWL-25 was incorporated into 
the existing maintenance or inspection program, within 144 months 
since Boeing Special Attention Service Bulletin 747-57-2327 was 
incorporated, or within 144 months after the most recent inspection 
was performed as specified in AWL No. 28-AWL-25, whichever occurs 
latest.
    (8) For AWL No. 28-AWL-31, ``Reserve Tank Refuel Valve 
Installation--Lightning Protection Electrical Bond'': 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-31 in the existing 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 6 months after the effective date of this 
AD, whichever occurs later.
    (ii) For airplanes not identified in paragraph (g)(8)(i) of this 
AD: Within 72 months since AWL No. 28-AWL-31 was incorporated into 
the existing maintenance or inspection program, or within 72 months 
after the most recent inspection was performed as specified in AWL 
No. 28-AWL-31, whichever occurs later.

(h) Differences From the Required Service Information

    (1) Where the ``Applicability'' column of AWL Nos. 28-AWL-25 and 
28-AWL-27 specifies ``ALL'' and ``NOTE,'' replace that text with 
``Airplanes L/N 645 and on.''
    (2) In the ``Description'' column of AWL Nos. 28-AWL-25 and 28-
AWL-27, remove the Applicability Note.

(i) Additional Acceptable Wire Types and Sleeving

    (1) Where AWL No. 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 No. 28-AWL-11 identifies TFE-2X Standard wall 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 Action for Certain ADs

    Accomplishment of the revision required by paragraph (g) of this 
AD terminates the requirements specified in paragraphs (k)(1) 
through (7) of this AD for that airplane:
    (1) The revision required by paragraphs (g) and (h) of AD 2008-
10-07 R1.
    (2) The revision required by paragraph (g)(1) of AD 2008-18-09.
    (3) The revision required by paragraph (h)(2) of AD 2010-13-12.
    (4) The revision required by paragraph (h) of AD 2010-24-13.
    (5) The revision required by paragraph (k) of AD 2011-06-03.
    (6) The revision required by paragraph (h)(2) of AD 2014-15-14.
    (7) The revision required by paragraph (h) of AD 2016-19-03.

(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)(1) of this AD. Information may be 
emailed to: [email protected].
    (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

    (1) For more information about this AD, contact Rose Len, 
Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch, 
2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-231-
3604; email: [email protected].
    (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; phone: 562-797-1717; internet: https://www.myboeingfleet.com. 
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 May 9, 2022.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness 
Division, Aircraft Certification Service.
[FR Doc. 2022-11750 Filed 6-1-22; 8:45 am]
BILLING CODE 4910-13-P