6422 Federal Register / Vol. 89, No. 22 / Thursday, February 1, 2024 / Rules and Regulations 

incorporated by the requirements of 

paragraph (3) of EASA AD 2023–0162, or 

within 90 days after the effective date of this 

AD, whichever occurs later. 

(4) This AD does not adopt the provisions 

specified in paragraphs (4) and (5) of EASA 

AD 2023–0162. 

(5) This AD does not adopt the ‘‘Remarks’’ 

section of EASA AD 2023–0162. 

(l) New Provisions for Alternative Actions, 

Intervals, and CDCCLs 

After the existing maintenance or 

inspection program has been revised as 

required by paragraph (j) of this AD, no 

alternative actions (e.g., inspections), 

intervals, and CDCCLs are allowed unless 

they are approved as specified in the 

provisions of the ‘‘Ref. Publications’’ section 

of EASA AD 2023–0162. 

(m) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation 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 International Validation 

Branch, mail it to the address identified in 

paragraph (n) of this AD or email to: 9-AVSAIR-730-AMOC@faa.gov. If mailing 

information, also submit information by 

email. Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or EASA; or Airbus SAS’s 

EASA Design Organization Approval (DOA). 

If approved by the DOA, the approval must 

include the DOA-authorized signature. 

(n) Additional Information 

For more information about this AD, 

contact Dat Le, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 562–627– 

5357; email dat.v.le@faa.gov. 

(o) 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 this AD specifies otherwise. 

(3) The following service information was 

approved for IBR on March 7, 2024. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2023–0162, dated August 17, 

2023. 

(ii) [Reserved] 

(4) The following service information was 

approved for IBR on March 8, 2022 (87 FR 

5391, February 1, 2022). 

(i) European Union Aviation Safety Agency 

(EASA) AD 2021–0209, dated September 15, 

2021. 

(ii) [Reserved] 

(5) For EASA AD 2023–0162 and EASA AD 

2021–0209, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, Germany; 

telephone: +49 221 8999 000; email: ADs@

easa.europa.eu; website: easa.europa.eu. You 

may find these EASA ADs on the EASA 

website: ad.easa.europa.eu. 

(6) You may view this material at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 2200 South 216th Street, Des 

Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(7) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit www.archives.gov/federal-register/cfr/ 

ibr-locations or email fr.inspection@nara.gov. 

Issued on January 26, 2024. 

Michael Linegang, 

Acting Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–01966 Filed 1–31–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–0657; Project 

Identifier AD–2022–01351–T; Amendment 

39–22652; AD 2024–01–01] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

The Boeing Company (Boeing) Model 

787–8, 787–9, and 787–10 airplanes. 

This AD was prompted by reports of 

undetected water leaks from the faucet 

control module (FCM) migrating below 

the passenger floor in multiple lavatory 

locations during flight, and into the 

electronic equipment bay(s). This AD 

requires repetitive general visual 

inspections of the area under all 

lavatory washbasins for evidence of 

intermittent and active leaks at the FCM 

and applicable on-condition actions. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

DATES: This AD is effective March 7, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of March 7, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–0657; 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 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. 

Material Incorporated by Reference: 

• 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; website 

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. It is also available at 

regulations.gov under Docket No. FAA– 

2023–0657. 

FOR FURTHER INFORMATION CONTACT: 

Courtney Tuck, Aviation Safety 

Engineer, FAA, 2200 South 216th St., 

Des Moines, WA 98198; telephone 206– 

231–3986; email Courtney.K.Tuck@

faa.gov. 

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 all Boeing Model 787–8, 787– 

9, and 787–10 airplanes. The NPRM 

published in the Federal Register on 

April 10, 2023 (88 FR 21120). The 

NPRM was prompted by reports of 

undetected water leaks from the FCM 

migrating below the passenger floor in 

multiple lavatory locations during 

flight, and into the electronic equipment 

bay(s). In the NPRM, the FAA advised 

that the FCMs are located under the 

sinks in each lavatory and have an Oring seal at the top of the FCM mixing 

chamber; a small amount of water 

leaking past the O-ring has been 

identified as the source of the leak. 

In the NPRM, the FAA proposed to 

require repetitive general visual 

inspections of the area under all 

lavatory washbasins for evidence of 

intermittent and active leaks at the FCM 

and applicable on-condition actions, 

including replacing the affected FCM. 


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Federal Register / Vol. 89, No. 22 / Thursday, February 1, 2024 / Rules and Regulations 6423 

The FAA is issuing this AD to address 

undetected water leaks, which could 

damage flight critical equipment. The 

unsafe condition, if not addressed, 

could result in loss of multiple line 

replaceable units (LRUs) and 

subsequent loss of continued safe flight 

and landing. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received comments from 

Boeing and the Air Line Pilots 

Association, International, who 

supported the NPRM without change. 

The FAA received additional 

comments from United Airlines (UAL), 

American Airlines (American), and All 

Nippon Airways (ANA). The following 

presents the comments received on the 

NPRM and the FAA’s response to each 

comment. 

Request To Allow Alternative Cleaning 

Material 

UAL noted that the proposed AD 

would require complying with the 

actions in table 1 of Boeing Alert 

Requirements Bulletin B787–81205– 

SB250290–00 RB, Issue 001, dated 

November 1, 2022, which then 

references the procedures in Service 

Bulletin B787–81205–SB250290–00 

Issue 001 or later approved issues for 

each action. UAL stated that the service 

bulletin contains a cleaning action that 

refers to a Jamco component 

maintenance manual (CMM) as an 

accepted procedure. UAL further stated 

that the instructions in the Jamco CMM 

for removing scale specify using a 

corrosive solution that can produce 

harmful fumes. As a result, UAL asked 

to use a milder product as an 

alternative. 

Both the requirements bulletin and 

the service bulletin state that where the 

instructions refer to another document, 

operators may use accepted alternative 

procedures. Where the instructions state 

a procedure must done in accordance 

with a Boeing document, then operators 

will need an alternative method of 

compliance (AMOC) to use a different 

procedure. Because the cleaning 

procedure mentioned by the commenter 

refers to the Jamco CMM, operators may 

use accepted alternative procedures, 

including a different accepted cleaning 

product, without obtaining an AMOC. 

No change to the AD is necessary as a 

result of this comment. 

Request To Limit Inspection Area 

In the NPRM, the FAA proposed to 

require visual inspections at all lavatory 

locations. American and ANA requested 

that the FAA limit the inspection to the 

area under the lavatory washbasins 

located in the door 1 and door 3 area 

near the electronic equipment bays. 

American added that leaks in other 

locations do not have the potential to 

cause damage to the LRUs and thus do 

not affect safe operation of the airplane. 

The FAA disagrees with the 

commenters’ request. The unsafe 

condition exists when two FCMs leak 

simultaneously, involving the loss of 

flight-critical equipment at different 

locations. This could occur at door 1, 2, 

3, or 4. Further, it is possible to have 

multiple persistent and simultaneous 

latent leaks from different lavatories on 

the same airplane. Therefore, it is 

necessary to inspect the lavatories at all 

locations, not just those near the 

electronic equipment bays. 

Request To Reference Master Minimum 

Equipment List (MMEL) Item 38–10– 

01A 

American requested that the FAA 

state that MMEL item 38–10–01A 

(which allows individual components of 

the potable water system to be 

inoperative provided associated 

components are deactivated or isolated 

and associated system components are 

verified to not have leaks) remains valid 

and applicable as a method to deactivate 

the water supply to a discrepant FCM. 

The FAA agrees that this AD does not 

conflict with an operator’s ability to 

dispatch an airplane with an inoperable 

potable water system under MMEL item 

38–10–01A. The FAA has not changed 

this AD in this regard. 

Request To Limit Actions for 

Intermittent Leaks 

ANA requested that the FAA revise 

the proposed AD to not require 

corrective action if intermittent leaks are 

found from the FCM. ANA stated that if 

evidence of intermittent leaks are found 

at the FCM, the source of the leak isn’t 

necessarily the FCM, and therefore it 

should not be necessary to replace the 

FCM or deactivate the water supply to 

the FCM. 

The FAA disagrees. Intermittent leaks 

may have a long latency period and be 

difficult to detect, but they can still 

cause the unsafe condition identified in 

this AD and therefore must be 

addressed. Operators with a method 

other than replacement of the FCM, 

which provides an acceptable level of 

safety, may request approval to use an 

AMOC. The FAA did not change this 

AD as a result of this request. 

Additional Changes to This Final Rule 

After the NPRM was published, 

Boeing notified the FAA that certain 

airplanes were modified in production 

and delivered with a redesigned FCM 

that is not subject to the unsafe 

condition. The FAA has determined the 

actions required by this AD are not 

necessary on those airplanes and has 

therefore revised the applicability of 

this AD to only include airplanes that 

were delivered with the affected FCM. 

Conclusion 

The FAA reviewed the relevant data, 

considered any comments received, and 

determined that air safety requires 

adopting this AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. Except for the 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 reviewed Boeing Alert 

Requirements Bulletin B787–81205– 

SB250290–00 RB, Issue 001, dated 

November 1, 2022. This service 

information specifies procedures for a 

repetitive general visual inspection of 

the area under all lavatory washbasins 

for evidence of intermittent and active 

leaks at the FCM and applicable oncondition actions. On-condition actions 

include replacing the affected FCM with 

new or serviceable FCM at affected 

lavatory washbasin(s), and doing a leak 

test. If a leak is found, the service 

information specifies doing applicable 

corrective action, repeating the leak test, 

and making sure no leak is found. 

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. 

Differences Between This AD and the 

Service Information 

The effectivity of Boeing Alert 

Requirements Bulletin B787–81205– 

SB250290–00 RB, Issue 001, dated 

November 1, 2022, is Model 787–8, –9, 

and –10 airplanes, line numbers 6 

through 9996. As the FAA stated in the 

NPRM, the agency would consider 

revising the applicability of the final 

rule to exclude airplanes with a 

redesigned FCM that eliminates the 

need for the actions required by this AD. 

Therefore, the applicability of this AD 

does not include those line-numbered 

airplanes with a redesigned FCM 

installed in production. 

Interim Action 

This AD is an interim action. The 

FAA is considering additional 

rulemaking regarding the redesigned 


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6424 Federal Register / Vol. 89, No. 22 / Thursday, February 1, 2024 / Rules and Regulations 

FCM that addresses the unsafe 

condition identified in this AD. 

Costs of Compliance 

The FAA estimates that this AD 

affects 140 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per product Cost on U.S. 

operators 

Inspection ........... 1 work-hour × $85 per hour = $85 per inspection cycle ..... $0 $85 per inspection cycle ....... $11,900 

The FAA estimates the following 

costs to do any necessary replacements 

that would be required based on the 

results of the inspection. The agency has 

no way of determining the number of 

aircraft that might need these 

replacements: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Replacement .................................... 1 work-hour × $85 per hour = $85 ............................................................ $6,021 $6,106 

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 

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 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2024–01–01 The Boeing Company: 

Amendment 39–22652; Docket No. 

FAA–2023–0657; Project Identifier AD– 

2022–01351–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective March 7, 2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to The Boeing Company 

Model 787–8, 787–9, and 787–10 airplanes, 

certificated in any category, having line 

numbers 6 through 687 inclusive, 689 

through 954 inclusive, 956 through 970 

inclusive, 972 through 982 inclusive, 984 

through 989 inclusive, 991 through 996 

inclusive, 999, 1001 through 1008 inclusive, 

1012, 1013, 1016 through 1019 inclusive, 

1021, 1022, 1024 through 1026 inclusive, 

1029 through 1032 inclusive, 1038, 1040, 

1041, 1044, 1045, 1047, 1048, 1054 through 

1062 inclusive, 1071, 1072, 1074, 1075, 1082, 

1085, 1087, 1091, 1094, 1095, 1098, 1099, 

1103, 1109, 1112 through 1114 inclusive, 

1117, 1118, 1121, 1122, 1125, 1126, 1128 

through 1134 inclusive, 1136 through 1145 

inclusive, 1147, 1148, 1151, 1161, and 1167. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 38, Water/waste. 

(e) Unsafe Condition 

This AD was prompted by reports of 

undetected water leaks from the faucet 

control module migrating below the 

passenger floor in multiple lavatory locations 

during flight, and into the electronic 

equipment bay(s). The FAA is issuing this 

AD to address undetected water leaks, which 

could damage flight critical equipment. The 

unsafe condition, if not addressed, could 

result in loss of multiple line replaceable 

units and subsequent loss of continued safe 

flight and landing. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Except as specified by paragraph (h) of this 

AD: At the applicable times specified in the 

‘‘Compliance’’ paragraph of Boeing Alert 

Requirements Bulletin B787–81205– 

SB250290–00 RB, Issue 001, dated November 

1, 2022, do all applicable actions identified 

in, and in accordance with, the 

Accomplishment Instructions of Boeing Alert 

Requirements Bulletin B787–81205– 

SB250290–00 RB, Issue 001, dated November 

1, 2022. 

Note 1 to paragraph (g): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Alert Service 

Bulletin B787–81205–SB250290–00, Issue 

001, dated November 1, 2022, which is 

referred to in Boeing Alert Requirements 


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Federal Register / Vol. 89, No. 22 / Thursday, February 1, 2024 / Rules and Regulations 6425 

Bulletin B787–81205–SB250290–00, Issue 

001, dated November 1, 2022. 

(h) Exceptions to Service Information 

Specifications 

Where the Compliance Time column of the 

table in the ‘‘Compliance’’ paragraph of 

Boeing Alert Requirements Bulletin B787– 

81205–SB250290–00 RB, Issue 001, dated 

November 1, 2022, uses the phrase ‘‘the Issue 

001 date of the Requirements Bulletin B787– 

81205–SB250290–00 RB,’’ this AD requires 

using ‘‘the effective date of this AD.’’ 

(i) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, AIR–520 Continued 

Operational Safety 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 (j) of this AD. 

Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(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, AIR–520 Continued Operational 

Safety 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. 

(j) Related Information 

For more information about this AD, 

contact Courtney Tuck, Aviation Safety 

Engineer, FAA, 2200 South 216th St., Des 

Moines, WA 98198; telephone 206–231– 

3986; email Courtney.K.Tuck@faa.gov. 

(k) 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) Boeing Alert Requirements Bulletin 

B787–81205–SB250290–00 RB, Issue 001, 

dated November 1, 2022. 

(ii) [Reserved] 

(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; website 

myboeingfleet.com. 

(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 material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit www.archives.gov/federal-register/cfr/ 

ibr-locations or email fr.inspection@nara.gov. 

Issued on January 3, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–01967 Filed 1–31–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1037; Project 

Identifier AD–2023–00511–T; Amendment 

39–22655; AD 2024–01–04] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2020–26– 

08, which applied to The Boeing 

Company Model 787–8, 787–9, and 

787–10 airplanes powered by RollsRoyce Trent 1000 engines. AD 2020–26– 

08 required repetitive inspections of the 

inner fixed structure (IFS) forward 

upper fire seal and thermal insulation 

blankets in the forward upper area of 

the thrust reverser (TR) for damage and 

applicable on-condition actions. Since 

the FAA issued AD 2020–26–08, the 

FAA determined that a new upper 

splitter fairing assembly is needed to 

prevent damage to the fire seal and 

thermal insulation blanket. This AD 

continues to require the actions 

specified in AD 2020–26–08 and 

requires determining if an affected part 

number of the upper splitter fairing 

assembly is installed on the engine, 

replacing an affected upper splitter 

fairing assembly part number with a 

new upper splitter fairing assembly part 

number, inspecting the IFS forward 

upper fire seal and thermal insulation 

blanket for any damage, and applicable 

on-condition actions. This AD also 

prohibits the installation of affected 

parts. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

DATES: This AD is effective March 7, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of March 7, 2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain other publication listed in 

this AD as of January 27, 2021 (85 FR 

83755, December 23, 2020). 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1037; 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 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. 

Material Incorporated by Reference: 

• For service information identified 

in this final rule, contact Boeing 

Commercial Airplanes, Attention: 

Contractual & Data Services (C&DS), 

2600 Westminster Boulevard, MC 110– 

SK57, Seal Beach, CA 90740–5600; 

telephone 562–797–1717; website 

myboeingfleet.com. 

• You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety 

Branch, 2200 South 216th Street, Des 

Moines, WA. For information on the 

availability of this material at the FAA, 

call 206–231–3195. It is also available at 

regulations.gov under Docket No. FAA– 

2023–1037. 

FOR FURTHER INFORMATION CONTACT: Tak 

Kobayashi, Aviation Safety Engineer, 

FAA, 2200 South 216th Street, Des 

Moines, WA 98198; telephone 206–231– 

3553; email takahisa.kobayashi@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2020–26–08, 

Amendment 39–21363 (85 FR 83755, 

December 23, 2020) (AD 2020–26–08). 

AD 2020–26–08 applied to The Boeing 

Company Model 787–8, 787–9, and 

787–10 airplanes powered by RollsRoyce Trent 1000 engines. AD 2020–26– 

08 required repetitive inspections of the 

IFS forward upper fire seal and thermal 

insulation blankets in the forward upper 

area of the TR for damage and 

applicable on-condition actions. 

The NPRM published in the Federal 

Register on May 25, 2023 (88 FR 33851). 

The NPRM was prompted by a 


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