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(4) AMOCs approved for AD 2020–03–20 

are approved as AMOCs for the 

corresponding provisions of this AD. 

(n) Related Information 

(1) For more information about this AD, 

contact Douglas Tsuji, Aviation Safety 

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

Moines, WA 98198; phone: 206–231–3548; 

Douglas.Tsuji@faa.gov. 

(2) Material identified in this AD that is not 

incorporated by reference is available at the 

addresses specified in paragraph (o)(3) of this 

AD. 

(o) 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 

737–34A3572 RB, dated October 15, 2020. 

(ii) Boeing Alert Requirements Bulletin 

737–34A3573 RB, dated August 5, 2020. 

(iii) Boeing Alert Requirements Bulletin 

777–34A0385 RB, Revision 1, dated March 8, 

2021. 

(3) For Boeing material 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 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. 

(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-locationsoremailfr.inspection@nara.gov. 

Issued on January 16, 2025. 

Suzanne Masterson, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2025–02376 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–2024–1887; Project 

Identifier MCAI–2023–01237–T; Amendment 

39–22929; AD 2025–01–05] 

RIN 2120–AA64 

Airworthiness Directives; Embraer S.A. 

(Type Certificate Previously Held by 

Yabora ̃ Indu ́ stria Aerona ́utica S.A.; 

Embraer S.A.) Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2022–25– 

07, which applied to all Embraer S.A. 

Model ERJ 170–100 LR, –100 STD, –100 

SE, and –100 SU airplanes; and Model 

ERJ 170–200 LR, –200 SU, –200 STD, 

and –200 LL airplanes. AD 2022–25–07 

required revising the existing 

maintenance or inspection program, as 

applicable, to incorporate new or more 

restrictive airworthiness limitations. 

This AD was prompted by a 

determination that new or more 

restrictive airworthiness limitations are 

necessary. This AD continues to require 

all actions in AD 2022–25–07 and 

requires revising the existing 

maintenance or inspection program, as 

applicable, to incorporate new or more 

restrictive airworthiness limitations, 

and certain structural modifications, as 

specified in an Ageˆncia Nacional de 

Aviac ̧a ̃o Civil (ANAC) AD, which is 

incorporated by reference. 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. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain other publication listed in 

this AD as of January 23, 2023 (87 FR 

77493, December 19, 2022). 

The Director of the Federal Register 

approved the incorporation by reference 

of certain other publications listed in 

this AD as of February 10, 2020 (85 FR 

453, January 6, 2020). 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2024–1887; 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, the mandatory 

continuing airworthiness information 

(MCAI), 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 ANAC material identified in 

this AD, contact National Civil Aviation 

Agency (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 material on the ANAC website at 

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

DAE.asp. 

• For Embraer material, contact 

Embraer S.A., Technical Publications 

Section (PC 060), Av. Brigadeiro Faria 

Lima, 2170—Putim—12227–901 Sa ̃o 

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. 

• 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–2024–1887. 

FOR FURTHER INFORMATION CONTACT: 

Joshua Bragg, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 817– 

222–5366; email joshua.k.bragg@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2022–25–07, 

Amendment 39–22263 (87 FR 77493, 

December 19, 2022) (AD 2022–25–07). 

AD 2022–25–07 applied to all Embraer 

S.A. Model ERJ 170–100 LR, –100 STD, 

–100 SE, and –100 SU airplanes; and 

Model ERJ 170–200 LR, –200 SU, –200 

STD, and –200 LL airplanes. AD 2022– 

25–07 required revising the existing 

maintenance or inspection program, as 

applicable, to incorporate new or more 

restrictive airworthiness limitations. 

The FAA issued AD 2022–25–07 to 

address fatigue cracking of various 

principal structural elements (PSEs); 

such cracking could result in reduced 

structural integrity of the airplane. AD 

2022–25–07 addressed safety significant 

latent failures; such failures, in 

combination with one or more other 

specified failures or events, could result 

in a hazardous or catastrophic failure 

condition of avionics, hydraulic 

systems, fire detection systems, fuel 

systems, or other critical systems. 

Furthermore, AD 2022–25–07 addressed 

the potential ignition sources inside fuel 

tanks caused by latent failures, 

alterations, repairs, or maintenance 

actions; such failures, in combination 

with flammable fuel vapors, could result 

in fuel tank explosions and consequent 

loss of the airplane. 


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The NPRM published in the Federal 

Register on July 18, 2024 (89 FR 58295). 

The NPRM was prompted by AD 2023– 

12–01, effective December 15, 2023, 

issued by ANAC, which is the aviation 

authority for Brazil (ANAC AD 2023– 

12–01) (also referred to as the MCAI). 

The MCAI states that new or more 

restrictive airworthiness limitations 

have been developed for Part 1— 

Certification Maintenance 

Requirements, Part 2—Airworthiness 

Limitation Inspections (ALI)— 

Structures, Part 3—Fuel System 

Limitation Items, and Part 4—Life 

Limited Items of the EMBRAER 170/175 

maintenance review board report 

(MRBR). The MCAI also stated that only 

airplanes with certain serial numbers 

are affected. 

In the NPRM, the FAA proposed to 

continue to require the airworthiness 

limitations specified in paragraphs (g) 

and (i) of AD 2022–25–07 until 

incorporation of the new or more 

restrictive airworthiness limitations and 

structural modifications, as specified in 

ANAC AD 2023–12–01 and required by 

paragraph (l) of this AD. The FAA is 

issuing this AD to address fatigue 

cracking of various principal structural 

elements (PSEs); such cracking could 

result in reduced structural integrity of 

the airplane. This AD also addresses 

safety significant latent failures; such 

failures, in combination with one or 

more other specified failures or events, 

could result in a hazardous or 

catastrophic failure condition of 

avionics, hydraulic systems, fire 

detection systems, fuel systems, or other 

critical systems. Furthermore, this AD 

addresses potential ignition sources 

inside fuel tanks caused by latent 

failures, alterations, repairs, or 

maintenance actions; such failures, in 

combination with flammable fuel 

vapors, could result in fuel tank 

explosions and consequent loss of the 

airplane. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2024–1887. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received a comment from 

the Air Line Pilots Association, 

International (ALPA), who supported 

the NPRM without change. 

The FAA received additional 

comments from Horizon Air. The 

following presents the comments 

received on the NPRM and the FAA’s 

response to each comment. 

Request To Update MRB Revision 

Horizon Air requested that the FAA 

update the revision for Appendix A— 

Airworthiness Limitations of EMBRAER 

170/175 Maintenance Review Board 

Report (MRBR), MRB–1621, Revision 

14, dated September 27, 2018, to 

Revision 19, dated July 14, 2023, 

referenced in paragraphs (p)(5)(i) and 

(ii) of this AD. Horizon Air asserted that 

Revision 19 is required to be 

incorporated by the MCAI referenced in 

paragraph (l) of this AD. 

FAA does not agree with the request. 

Appendix A—Airworthiness 

Limitations of EMBRAER 170/175 

MRBR, MRB–1621, Revision 19, dated 

July 14, 2023, is not explicitly 

referenced in this AD, since this AD 

directs operators to comply with the 

MCAI, which is incorporated by 

reference in this AD. Therefore, 

Revision 19 of that MRB is not 

incorporated by reference. The only 

MRBR document explicitly referenced 

in the AD requirements is Revision 14, 

as specified in the retained 

requirements in paragraph (g) of this 

AD. This AD has not been changed 

regarding this request. 

Request To Allow for Incorporation of 

Temporary Revisions (TRs) 

Horizon stated that since the issuance 

of the MCAI, which requires Appendix 

A—Airworthiness Limitations of 

EMBRAER 170/175 Maintenance 

Review Board Report (MRBR), MRB– 

1621, Revision 19, dated July 14, 2023, 

ANAC has issued two TRs, TR 19–1, 

dated October 31, 2023, and TR 19–2, 

dated March 21, 2024. Horizon 

requested that the FAA clarify whether 

paragraph (m)(2) of the proposed AD 

allows incorporating approved 

temporary revisions (TRs) of MRB–1621 

subsequent to Revision 19, dated July 

14, 2023. If TR 19–1 and 19–2 are not 

specifically allowed, Horizon requested 

that the proposed AD be revised to 

allow use of TR 19–1 and 19–2 and 

further revisions allowed by ANAC. 

Paragraph (m)(2) of this AD allows the 

use of alternative inspections and 

intervals published in later ANACapproved revisions. The operators are 

allowed to incorporate Revision 19 of 

the MRB as modified by TR 19–1 and 

TR 19–2. This AD has not been changed 

regarding this request. 

Request To Terminate Exceptions 

Related to Retained Actions 

Horizon requested that the FAA 

terminate the exceptions paragraphs 

related to retained actions. Horizon 

stated that the new actions in paragraph 

(l) of the proposed AD terminate the 

retained actions in paragraphs (g) and (i) 

of the AD. Those paragraphs had their 

own exceptions paragraphs that also 

carried over from AD 2022–25–07. 

Those exceptions paragraphs are no 

longer applicable. 

The FAA agrees the retained 

restrictions and exceptions are no longer 

applicable once the terminating action 

is accomplished. The FAA does not 

agree with the need to terminate 

paragraphs (h), (j), and (k) of the AD 

because those provisions no longer 

apply once the actions of paragraph (l) 

of this AD are accomplished. This AD 

has not been changed regarding this 

request. 

Conclusion 

This product has been approved by 

the aviation authority of another 

country and is approved for operation in 

the United States. Pursuant to the FAA’s 

bilateral agreement with this State of 

Design Authority, it has notified the 

FAA of the unsafe condition described 

in the MCAI referenced above. The FAA 

reviewed the relevant data, considered 

the 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 this product. Except for 

minor editorial changes, 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 

ANAC AD 2023–12–01, effective 

December 15, 2023, specifies new or 

more restrictive airworthiness 

limitations for certification maintenance 

requirements, airplane structures, fuel 

systems, and safe life limits. 

This AD also requires ANAC AD 

2022–02–01, effective February 9, 2022, 

which the Director of the Federal 

Register approved for incorporation by 

reference as of January 23, 2023 (87 FR 

77493, December 19, 2022). 

This AD also requires Appendix A— 

Airworthiness Limitations of EMBRAER 

170/175 Maintenance Review Board 

Report (MRBR), MRB–1621, Revision 

14, dated September 27, 2018; and 

Embraer Temporary Revision (TR) 14–1, 

dated November 13, 2018, to Part 4— 

Life-Limited Items, of Appendix A of 

EMBRAER 170/175 Maintenance 

Review Board Report (MRBR), MRB– 

1621, Revision 14, dated September 27, 

2018; which the Director of the Federal 

Register approved for incorporation by 

reference as of February 10, 2020 (85 FR 

453, January 6, 2020). 

This material is reasonably available 

because the interested parties have 


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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 662 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

The FAA estimates the following 

costs to comply with the retained 

actions from AD 2022–25–07: 

ESTIMATED COSTS FOR REQUIRED ACTIONS * 

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Retained structural modifications ................... 196 work-hours × $85 per hour = $16,660 .... $98,860 $115,520 Up to $76,474,240. 

* Table does not include estimated costs for revising the existing maintenance or inspection program. 

The FAA estimates the total cost per 

operator for the retained revision of the 

existing maintenance or inspection 

program from AD 2022–25–07 to be 

$7,650 (90 work-hours × $85 per workhour). 

The FAA has determined that revising 

the existing maintenance or inspection 

program takes an average of 90 workhours 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. 

The FAA estimates the total cost per 

operator for the new actions to be 

$7,650 (90 work-hours × $85 per workhour). 

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: 

■ a. Removing Airworthiness Directive 

(AD) 2022–25–07, Amendment 39– 

22263 (87 FR 77493, December 19, 

2022); and 

■ b. Adding the following new AD: 

2025–01–05 Embraer S.A. (Type Certificate 

Previously Held by Yabora ̃ Indu ́ stria 

Aerona ́utica S.A.; Embraer S.A.): 

Amendment 39–22929; Docket No. 

FAA–2024–1887; Project Identifier 

MCAI–2023–01237–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective March 17, 2025. 

(b) Affected ADs 

This AD replaces AD 2022–25–07, 

Amendment 39–22263 (87 FR 77493, 

December 19, 2022) (AD 2022–25–07). 

(c) Applicability 

This AD applies to Embraer S.A. Model 

ERJ 170–100 LR, –100 SE, –100 STD, and 

–100 SU airplanes; and Model ERJ 170–200 

LR, –200 STD, –200 SU, and –200 LL 

airplanes; certificated in any category, with 

manufacturer serial numbers 17000002, 

17000004 through 17000013 inclusive, and 

17000015 through 17000948 inclusive. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 05, Time Limits/Maintenance 

Checks. 

(e) Unsafe Condition 

This AD was prompted by a determination 

that new or more restrictive airworthiness 

limitations are necessary. The FAA is issuing 

this AD to address fatigue cracking of various 

principal structural elements (PSEs); such 

cracking could result in reduced structural 

integrity of the airplane. The FAA is also 

issuing this AD to address safety significant 

latent failures; such failures, in combination 

with one or more other specified failures or 

events, could result in a hazardous or 

catastrophic failure condition of avionics, 

hydraulic systems, fire detection systems, 

fuel systems, or other critical systems. 

Furthermore, the FAA is issuing this AD to 

address potential ignition sources inside fuel 

tanks caused by latent failures, alterations, 

repairs, or maintenance actions; such 

failures, 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) Retained Revision of the Existing 

Maintenance or Inspection Program From 

AD 2019–25–16, Amendment 39–21015 (85 

FR 453, January 6, 2020) (AD 2019–25–16), 

With No Changes 

This paragraph restates the requirements of 

paragraph (g) of AD 2022–25–07, with no 

changes. For Model ERJ 170–100 LR, –100 

STD, –100 SE, and –100 SU airplanes; and 

Model ERJ 170–200 LR, –200 SU, –200 STD, 

and –200LL airplanes; manufacturer serial 

numbers 17000002, 17000004 through 

17000013 inclusive, and 17000015 through 

17000761 inclusive: Within 90 days after 

February 10, 2020 (the effective date of AD 

2019–25–16), revise the existing maintenance 

or inspection program, as applicable, to 


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incorporate the information specified in Part 

1—Certification Maintenance Requirements, 

Part 2—Airworthiness Limitation Inspections 

(ALI) Structures, Part 3—Fuel System 

Limitation Items, and Part 4—Life Limited 

Items; and EMBRAER Temporary Revision 

(TR) 14–1, dated November 13, 2018, to Part 

4—Life Limited Items; of Appendix A of the 

EMBRAER 170/175 MRBR, MRB–1621, 

Revision 14, dated September 27, 2018 

(EMBRAER 170/175 MRB–1621, Revision 

14). The initial compliance time for doing the 

tasks is at the later of the times specified in 

paragraphs (g)(1) and (2) of this AD. 

(1) Within the applicable times specified in 

EMBRAER 170/175 MRB–1621, Revision 14. 

For the purposes of this AD, the initial 

compliance times (identified as ‘‘Threshold’’ 

or ‘‘T’’ in EMBRAER 170/175 MRB–1621, 

Revision 14) are expressed in ‘‘total flight 

cycles’’ or ‘‘total flight hours,’’ as applicable. 

(2) Within 90 days or 600 flight cycles after 

February 10, 2020 (the effective date of AD 

2019–25–16), whichever occurs later. 

(h) Retained Restrictions on Alternative 

Actions, Intervals, and CDCCLs, With No 

Changes 

This paragraph restates the requirements of 

paragraph (h) of AD 2022–25–07, with no 

changes. Except as required by paragraphs (i) 

and (l) of this AD: 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 AMOC in accordance with the 

procedures specified in paragraph (n)(1) of 

this AD. 

(i) Retained Revision of the Existing 

Maintenance or Inspection Program, With 

No Changes 

This paragraph restates the requirements of 

paragraph (i) of AD 2022–25–07, with no 

changes. For Embraer S.A. Model ERJ 170– 

100 LR, –100 STD, –100 SE, and –100 SU 

airplanes; and Model ERJ 170–200 LR, –200 

SU, –200 STD, and –200 LL airplanes: Except 

as specified in paragraph (j) of this AD, 

comply with all required actions and 

compliance times specified in, and in 

accordance with, ANAC AD 2022–02–01, 

dated February 9, 2022 (ANAC AD 2022–02– 

01). Accomplishing the revision of the 

existing maintenance or inspection program 

required by this paragraph terminates the 

requirements for Part 2—Airworthiness 

Limitation Inspections (ALI) Structures 

specified in paragraph (g) of this AD only. 

Accomplishing the revision of the existing 

maintenance or inspection program required 

by paragraph (l) of this AD terminates the 

requirements of this paragraph. 

(j) Retained Exceptions to ANAC AD 2022– 

02–01 

(1) Where ANAC AD 2022–02–01 refers to 

its effective date, this AD requires using 

January 23, 2023 (the effective date of AD 

2022–25–07). 

(2) The ‘‘Alternative method of compliance 

(AMOC)’’ section of ANAC AD 2022–02–01 

does not apply to this AD. 

(3) Where paragraph (b)(1) of ANAC AD 

2022–02–01 specifies incorporating all 

airworthiness limitations in Part 2 of the 

material specified in paragraph (b)(1) of 

ANAC AD 2022–02–01, for this AD, do not 

incorporate the threshold and interval for 

maintenance review board report (MRBR) 

task number 57–30–002–0002, ‘‘Enhanced 

Wingtip to Wing Spar Attachments— 

Internal.’’ 

Note 1 to paragraph (j)(3): AD 2022–11–51, 

Amendment 39–22074 (87 FR 33623, June 3, 

2022) (AD 2022–11–51), requires, among 

other actions, incorporating alternate 

thresholds and intervals for MRBR task 

number 57–30–002–0002. The airplanes 

affected by MRBR task number 57–30–002– 

0002 are identified in paragraph (c) of AD 

2022–11–51. 

(k) Retained Provisions for Alternative 

Actions and Intervals, With a New Exception 

This paragraph restates the requirements of 

paragraph (k) of AD 2022–25–07, with no 

changes. Except as required by paragraph (l) 

of this AD: After the existing maintenance or 

inspection program has been revised as 

required by paragraph (i) of this AD, no 

alternative actions (e.g., inspections), 

intervals, or CDCCLs are allowed unless they 

are approved as specified in paragraph (f) of 

ANAC AD 2022–02–01. 

(l) New Revision of the Existing Maintenance 

or Inspection Program 

Except as specified in paragraph (m) of this 

AD: Comply with all required actions and 

compliance times specified in, and in 

accordance with, Ageˆncia Nacional de 

Aviac ̧a ̃o Civil (ANAC) AD 2023–12–01, 

effective December 15, 2023 (ANAC AD 

2023–12–01). Accomplishing the revision of 

the existing maintenance or inspection 

program required by this paragraph 

terminates the requirements in paragraphs (g) 

and (i) of this AD. 

(m) Exceptions to ANAC AD 2023–12–01 

(1) Where ANAC AD 2023–12–01 refers to 

its effective date, this AD requires using the 

effective date of this AD. 

(2) Where paragraph (c) of ANAC AD 

2023–12–01 refers to ‘‘no alternative 

inspections or inspection intervals may be 

used unless the alternative inspection or 

interval is published in revisions approved 

by ANAC of the MRB–1621 which are 

subsequent to Revision 19, dated July 14th, 

2023, or approved as an alternative method 

of compliance (AMOC) in accordance with 

the procedures specified in paragraph (d) of 

this AD,’’ for this AD, replace that text with 

‘‘no alternative actions (e.g., inspections), 

intervals, and CDCCLs may be used unless 

the alternative action (e.g., inspection), 

interval, or CDCCL is published in revisions 

approved by ANAC of the MRB–1621 which 

are subsequent to Revision 19, dated July 

14th, 2023.’’ 

(3) This AD does not adopt paragraph (d) 

of ANAC AD 2023–12–01. 

(4) Where paragraph (b)(1) of ANAC AD 

2023–12–01 specifies incorporating all 

airworthiness limitations in Part 2 of the 

service information specified in paragraph 

(b)(1) of ANAC AD 2023–12–01, for this AD, 

do not incorporate the threshold and interval 

for MRBR task number 57–30–002–0002, 

‘‘Enhanced Wingtip to Wing Spar 

Attachments—Internal.’’ 

Note 2 to paragraph (m)(4): AD 2022–11– 

51, requires, among other actions, 

incorporating alternate thresholds and 

intervals for MRBR task number 57–30–002– 

0002. The airplanes affected by MRBR task 

number 57–30–002–0002 are identified in 

paragraph (c) of AD 2022–11–51. 

(n) 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 (o) of this AD. Information may be 

emailed to: AMOC@faa.gov. 

(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 ANAC; or ANAC’s 

authorized Designee. If approved by the 

ANAC Designee, the approval must include 

the Designee’s authorized signature. 

(o) Additional Information 

For more information about this AD, 

contact Joshua Bragg, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 817– 

222–5366; email joshua.k.bragg@faa.gov. 

(p) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) 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 this AD specifies otherwise. 

(3) The following material was approved 

for IBR on March 17, 2025. 

(i) Ageˆncia Nacional de Aviac ̧a ̃o Civil 

(ANAC) AD 2023–12–01, effective December 

15, 2023. 

(ii) [Reserved] 

(4) The following material was approved 

for IBR on January 23, 2023 (87 FR 77493, 

December 19, 2022). 

(i) ANAC AD 2022–02–01, effective 

February 9, 2022. 

(ii) [Reserved] 

(5) The following material was approved 

for IBR on February 10, 2020 (85 FR 453, 

January 6, 2020). 

(i) Appendix A—Airworthiness 

Limitations of EMBRAER 170/175 

Maintenance Review Board Report (MRBR), 

MRB–1621, Revision 14, dated September 27, 

2018. 

(ii) Embraer Temporary Revision (TR) 14– 

1, dated November 13, 2018, to Part 4—LifeLimited Items, of Appendix A of EMBRAER 

170/175 Maintenance Review Board Report 

(MRBR), MRB–1621, Revision 14, dated 

September 27, 2018. 


ddrumheller on DSK120RN23PROD with RULES1
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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