Federal Register / Vol. 90, No. 26 / Monday, February 10, 2025 / Rules and Regulations 9201 

(6) For ANAC ADs, contact ANAC, 

Aeronautical Products Certification Branch 

(GGCP), Rua Dr. Orlando Feirabend Filho, 

230—Centro Empresarial Aquarius—Torre 

B—Andares 14 a 18, Parque Residencial 

Aquarius, CEP 12.246–190—Sa ̃o Jose ́ dos 

Campos—SP, Brazil; telephone 55 (12) 3203– 

6600; email pac@anac.gov.br; website 

anac.gov.br/en/. You may find this ANAC 

AD on the ANAC website at 

sistemas.anac.gov.br/certificacao/DA/ 

DAE.asp. 

(7) For Embraer material, contact Embraer 

S.A., Technical Publications Section (PC 

060), Av. Brigadeiro Faria Lima, 2170— 

Putim—12227–901 Sao Jose dos Campos— 

SP—Brasil; telephone +55 12 3927–5852 or 

+55 12 3309–0732; fax +55 12 3927–7546; 

email distrib@embraer.com.br; internet 

flyembraer.com. 

(8) You may view this material 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. 

(9) 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 6, 2025. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2025–02381 Filed 2–7–25; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–1690; Project 

Identifier AD–2024–00083–T; Amendment 

39–22938; AD 2025–02–05] 

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 all The 

Boeing Company (Boeing) Model 747– 

100, 747–100B, 747–100B SUD, 747– 

200B, 747–200C, 747–200F, 747–300, 

747–400, 747–400D, 747–400F, 747SP, 

and 747SR series airplanes. This AD 

was prompted by a report of improper 

inner diameter grinding of landing gear 

outer cylinders, resulting in possible 

heat damage to the outer cylinder of the 

nose landing gear (NLG), body landing 

gear (BLG), and wing landing gear 

(WLG). This AD requires replacing any 

affected outer cylinders. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective March 17, 

2025. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of March 17, 2025. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2024–1690; 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 The Boeing Company material 

identified in this AD, 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 material 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–2024–1690. 

FOR FURTHER INFORMATION CONTACT: 

Stefanie Roesli, Aviation Safety 

Engineer, FAA, 2200 South 216th St., 

Des Moines, WA 98198; telephone 206– 

231–3964; email stefanie.n.roesli@

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 747–100, 

747–100B, 747–100B SUD, 747–200B, 

747–200C, 747–200F, 747–300, 747– 

400, 747–400D, 747–400F, 747SP, and 

747SR series airplanes. The NPRM 

published in the Federal Register on 

June 20, 2024 (89 FR 51861). The NPRM 

was prompted by a report of improper 

inner diameter grinding of landing gear 

outer cylinders, resulting in possible 

heat damage to the outer cylinder of the 

NLG, BLG, and WLG. In the NPRM, the 

FAA proposed to require replacing any 

affected outer cylinders. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received one comment from 

The Air Line Pilots Association, 

International (ALPA) who supported the 

NPRM without change. 

The FAA received two additional 

comments from Boeing. The following 

presents the comments received on the 

NPRM and the FAA’s response to each 

comment. 

Request To Clarify Affected Outer 

Cylinder Serial Numbers 

Boeing requested that an exception 

paragraph be added to clarify affected 

outer cylinder numbers. Boeing stated 

Boeing Alert Requirements Bulletin 

747–32A2535 RB, dated January 22, 

2024, inadvertently lists nine serial 

numbers without the correct number of 

leading zeros. Boeing requested that the 

FAA add the following language to 

paragraph (h) of the proposed AD, 

‘‘Where Appendix B of Boeing Alert 

Requirements Bulletin 747–32A2535 

RB, Original Issue dated January 22, 

2024, specifies two-digit serial numbers, 

add two leading zeros (e.g., serial 

number 47 should be 0047). Where 

Appendix B of Boeing Alert 

Requirements Bulletin 747–32A2535 

RB, Original Issue dated January 22, 

2024, specifies three-digit serial 

numbers, add one leading zero (e.g., 

serial number 109 should be 0109).’’ 

The FAA concurs with the comment. 

The serial numbers listed in Appendix 

B of Boeing Alert Requirements Bulletin 

747–32A2535 RB, dated January 22, 

2024, are part of the required action to 

find the parts affected by the unsafe 

condition. Furthermore, the two-digit 

and three-digit serial numbers listed in 

Appendix B of Boeing Alert 

Requirements Bulletin 747–32A2535 

RB, dated January 22, 2024, do not exist 

and the request is for clarification only. 

The FAA has revised this AD 

accordingly. 

Request To Add a Parts Installation 

Prohibition 

Boeing requested that a parts 

installation prohibition paragraph be 

added to the proposed AD. Boeing 

stated the outer cylinders of the NLG, 

BLG, and WLG are rotable structural 

components which may be moved from 

one airplane to another. Boeing stated 

the applicability of the AD covers all inservice Model 747 airplanes noted in 

Boeing Alert Requirements Bulletin 

747–32A2535 RB, dated January 22, 

2024; however the parts installation 


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9202 Federal Register / Vol. 90, No. 26 / Monday, February 10, 2025 / Rules and Regulations 

prohibition is needed to prevent the 

affected outer cylinders from being 

moved onto airplanes which have 

already complied with the required 

actions of the AD. 

The FAA agrees to clarify. 14 CFR 

39.7 specifies that once an AD is issued, 

no person may operate a product to 

which the AD applies except in 

accordance with the requirements of 

that AD. Further, 14 CFR 39.9 imposes 

a continuing obligation to maintain 

compliance with an AD by establishing 

a separate violation for each time an 

aircraft is operated that fails to meet AD 

requirements. Thus, operators have an 

ongoing obligation to ensure that the 

AD-mandated configuration is 

maintained. The FAA has not changed 

this AD as a result of the request. 

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 minor editorial 

changes, and any other changes 

described previously, this AD is 

adopted as proposed in the NPRM. 

None of the changes will increase the 

economic burden on any operator. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

The FAA reviewed Boeing Alert 

Requirements Bulletin 747–32A2535 

RB, dated January 22, 2024. This 

material specifies procedures for 

determining whether the outer cylinder 

of the NLG, the right and left WLG, and 

the right and left BLG have an affected 

part number and serial number and 

replacing all affected outer cylinders. 

This material is reasonably available 

because the interested parties have 

access to it through their normal course 

of business or by the means identified 

in the ADDRESSES section. 

Costs of Compliance 

The FAA estimates that this AD 

affects 168 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 or maintenance records check for affected parts.3 work-hours × $85 per hour = $255 ................. $0 $255 $42,840 

The FAA estimates the following 

costs to do any replacements that would 

be required based on the results of the 

inspection or maintenance records 

check. The agency has no way of 

determining the number of airplanes 

that might need this replacement: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Replacement of outer cylinder (67 affected 

parts).

161 work-hours × $85 per hour = $13,685 $325,000 $338,685 $22,691,895 (67 affected 

parts). 

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: 

2025–02–05 The Boeing Company: 

Amendment 39–22938; Docket No. 

FAA–2024–1690; Project Identifier AD– 

2024–00083–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective March 17, 2025. 


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Federal Register / Vol. 90, No. 26 / Monday, February 10, 2025 / Rules and Regulations 9203 

(b) Affected ADs 

None. 

(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, 747–400, 747–400D, 747–400F, 

747SP, and 747SR series airplanes, 

certificated in any category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 32, Landing gear. 

(e) Unsafe Condition 

This AD was prompted by a report of 

improper inner diameter grinding of landing 

gear outer cylinders, resulting in possible 

heat damage to the outer cylinder of the nose 

landing gear (NLG), body landing gear (BLG), 

and wing landing gear (WLG). The FAA is 

issuing this AD to address heat damage to the 

outer cylinder of the NLG, BLG, and WLG. 

The unsafe condition, if not addressed, could 

cause failure of a principal structural element 

to sustain its limit load or collapse of the 

landing gear, which may result in loss of 

control of the airplane or a runway departure. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Except as specified in paragraph (h) of this 

AD: At the applicable times specified in the 

‘‘Compliance’’ paragraph of Boeing Alert 

Requirements Bulletin 747–32A2535 RB, 

dated January 22, 2024, do all applicable 

actions identified in, and in accordance with, 

the Accomplishment Instructions of Boeing 

Alert Requirements Bulletin 747–32A2535 

RB, dated January 22, 2024. 

Note 1 to paragraph (g): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Alert Service 

Bulletin 747–32A2535, dated January 22, 

2024, which is referred to in Boeing Alert 

Requirements Bulletin 747–32A2535 RB, 

dated January 22, 2024. 

(h) Exceptions to Requirements Bulletin 

Specifications 

(1) Where the ‘‘Boeing Recommended 

Compliance Time’’ column in the table under 

the ‘‘Compliance’’ paragraph of Boeing Alert 

Requirements Bulletin 747–32A2535 RB, 

dated January 22, 2024, refers to ‘‘the 

Original Issue date of Requirements Bulletin 

747–32A2535 RB,’’ this AD requires using 

the effective date of this AD. 

(2) Where Appendix B of Boeing Alert 

Requirements Bulletin 747–32A2535 RB, 

dated January 22, 2024, specifies two-digit 

serial numbers, add two leading zeros (e.g., 

serial number 47 should be 0047). 

(3) Where Appendix B of Boeing Alert 

Requirements Bulletin 747–32A2535 RB, 

dated January 22, 2024, specifies three-digit 

serial numbers, add one leading zero (e.g., 

serial number 109 should be 0109). 

(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)(1) of this AD. 

Information may be emailed to: AMOC@

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 

(1) For more information about this AD, 

contact Stefanie Roesli, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, Des 

Moines, WA 98198; telephone 206–231– 

3964; email stefanie.n.roesli@faa.gov. 

(2) Material identified in this AD that is not 

incorporated by reference is available at the 

address specified in paragraph (k)(3) of this 

AD. 

(k) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the material listed in this paragraph under 5 

U.S.C. 552(a) and 1 CFR part 51. 

(2) You must use this material as 

applicable to do the actions required by this 

AD, unless the AD specifies otherwise. 

(i) Boeing Alert Requirements Bulletin 

747–32A2535 RB, dated January 22, 2024. 

(ii) [Reserved] 

(3) For The Boeing Company material 

identified in this AD, 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. 

(4) 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. 

(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 emailfr.inspection@nara.gov. 

Issued on January 16, 2025. 

Suzanne Masterson, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2025–02398 Filed 2–7–25; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1488; Project 

Identifier AD–2023–00182–T; Amendment 

39–22946; AD 2025–02–13] 

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 Model 757–200, 

–200CB, and –200PF series airplanes. 

This AD was prompted by a report 

indicating an operator has found cracks 

on three Model 757–200PF airplanes at 

the main deck cargo door cutout 

forward and aft hinge attachment holes. 

This AD requires a maintenance record 

check for repairs at the forward and aft 

hinge areas of the main deck cargo door 

cutout; repetitive open-hole high 

frequency eddy current (HFEC) 

inspections for cracks in the unrepaired 

areas of the bear strap, skin, doubler, 

and upper sill chord at the main deck 

cargo door forward and aft hinge 

attachment holes; and applicable 

corrective actions. The FAA is issuing 

this AD to address the unsafe condition 

on these products. 

DATES: This AD is effective March 17, 

2025. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of March 17, 2025. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1488; 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. 


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