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 Department of Transportation Federal Aviation Administration 14 CFR Part 39
[Docket No. FAA-2025-0012; Project Identifier AD-2024-00219-T]
RIN 2120-AA64
 AGENCY: Federal Aviation Administration (FAA), DOT.
 ACTION: Notice of proposed rulemaking (NPRM).
 SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 757-200, -200CB, and -300 series airplanes. This proposed AD was prompted by a report of cracking found in new locations at a certain body station (STA) during frame segment replacement repairs, including in the web at the K-hole between certain stringers, in the outer chord above the lower hinge intercostal, and in the inner chord and web between certain stringers. This proposed AD would require an inspection or records check for the presence of approved or local repairs, repetitive eddy current inspections for cracking, and applicable on-condition actions. 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 March 17, 2025.
 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 
                        *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. *AD Docket:*
                         You may examine the AD docket at 
                        *regulations.gov*
                         under Docket No. FAA-2025-0012; 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. *Material Incorporated by Reference:* For the Boeing material identified in this proposed 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.*
                    For the Aviation Partners Boeing material identified in this proposed AD, contact Aviation Partners Boeing, 2811 South 102nd St., Suite 200, Seattle, WA 98168; telephone 206-830-7699; fax 206-767-0535; email*leng@aviationpartners.com;*
                         website 
                        *aviationpartnersboeing.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. Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024, is also available at*regulations.gov*
                         under Docket No. FAA-2025-0012.
 FOR FURTHER INFORMATION CONTACT: Wayne Ha, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 562-627-5238; email: 
                        *wayne.ha@faa.gov.*


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 the 
                    **ADDRESSES**
                     section. Include “Docket No. FAA-2025-0012; Project Identifier AD-2024-00219-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 
                    *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 Wayne Ha, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 562-627-5238; email: 
                    *wayne.ha@faa.gov.*
                     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 received a report indicating that cracks were found in new locations at STA 1640 during frame segment replacement repairs, including in the web at the K-hole between stringer S-9 and S-10, in the outer chord above the lower hinge intercostal, and in the inner chord and web between S-10 and S-19. The existing inspection program for the STA 1640 frame is not sufficient to detect cracks in these locations because most of the frame is hidden by adjacent structure that makes the maintenance planning data (MPD) document inspections inadequate to detect cracks before they reach a critical size. Additionally, existing AD-mandated inspections are at other locations. Undetected cracks in the 
                    ( print page 8691)
                    fuselage frame at STA 1640 could affect a principal structural element's ability to sustain limit load. This condition, if not addressed, could result in reduced structural integrity of the airplane. FAA's Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design. Material Incorporated by Reference Under 1 CFR Part 51 The FAA reviewed Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024. This material specifies procedures for an inspection or records check for the presence of approved repairs at STA 1640 frame between S-9 and S-19, left and right sides, or local repairs at specified locations at STA 1640, repetitive eddy current inspections for cracking of the STA 1640 frame inner chord, web and outer chord at specified locations, and applicable on-condition actions. On-condition actions include contacting Boeing for repair. The FAA also reviewed Aviation Partners Boeing Alert Service Bulletin AP757-53-006, dated May 7, 2024. This material specifies procedures for an inspection or records check for the presence of approved repairs at STA 1640 frame between S-9 and S-19, left and right sides, or local repairs at specified locations at STA 1640, repetitive eddy current inspections for cracking of the STA 1640 frame inner chord, web and outer chord at specified locations, and applicable on-condition actions. On-condition actions include contacting Boeing for repair. These documents are distinct since they apply to different airplane configurations. 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. Proposed AD Requirements in This NPRM This proposed AD would require accomplishing the actions specified in the material already described, except for any differences identified as exceptions in the regulatory text of this proposed AD. For information on the procedures and compliance times, see Boeing Alert Requirements Bulletin 757-53A0123, dated March 13, 2024, at 
                    *regulations.gov*
                     under Docket No. FAA-2025-0012. Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 481 airplanes of U.S. registry. The FAA estimates the following costs to comply with this proposed AD: Estimated Costs
Action
Labor cost
Parts cost
Cost per product
Cost on U.S. operatorsInspection for presence of repairs
69 work-hours × $85 per hour = $5,865
None
$5,865
$2,821,065.Eddy current inspections
Up to 74 work-hours × $85 per hour = $6,290 per inspection cycle
None
Up to $6,290 per inspection cycle
Up to $3,025,490 per inspection cycle.
 The FAA has received no definitive data on which to base the cost estimates for the repairs specified in this proposed AD. 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. 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
 1.The authority citation for part 39 continues to read as follows: Authority:
                    49 U.S.C. 106(g), 40113, 44701. § 39.13
 2.The FAA amends § 39.13 by adding the following new airworthiness directive: **The Boeing Company:**
                         Docket No. FAA-2025-0012; Project Identifier AD-2024-00219-T. (a) Comments Due Date The FAA must receive comments on this airworthiness directive (AD) by March 17, 2025. (b) Affected ADs None. (c) Applicability This AD applies to The Boeing Company Model 757-200, -200CB, and -300 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024.
                        ( print page 8692) (d) Subject Air Transport Association (ATA) of America Code 53, Fuselage. (e) Unsafe Condition This AD was prompted by a report of cracking found in new locations at body station (STA) 1640 during frame segment replacement repairs, including in the web at the K-hole between stringer S-9 and S-10, in the outer chord above the lower hinge intercostal, and in the inner chord and web between stringers S-10 and S-19. The FAA is issuing this AD to address undetected cracks in the fuselage frame at STA 1640, which could affect a principal structural element's ability to sustain limit load. The unsafe condition, if not addressed, could result in reduced structural integrity of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions (1) For all airplanes except those identified in paragraph (g)(2) of this AD: Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024. **Note 1 to paragraph (g)(1):**
                         Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 757-53A0123, dated March 13, 2024, which is referred to in Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024. (2) For airplanes identified in Aviation Partners Boeing Alert Service Bulletin AP757-53-006, dated May 7, 2024: Except as specified in paragraph (h) of this AD, at the applicable times specified in paragraph 1.E., “Compliance,” of Aviation Partners Boeing Alert Service Bulletin AP757-53-006, dated May 7, 2024, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024. (h) Exceptions to Requirements Bulletin Specifications (1) Where Compliance Time columns of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024, refer to the original issue date of Requirements Bulletin 757-53A0123 RB, this AD requires using the effective date of this AD. (2) Where Boeing Alert Requirements Bulletin 757-53A0123 RB, dated March 13, 2024, specifies contacting Boeing for repair instructions or for alternative inspections: This AD requires doing the repair, or doing the alternative inspections and applicable on-condition actions using a method approved in accordance with the procedures specified in paragraph (i) of this AD. (3) Where Compliance Time columns of the tables in the “Compliance” paragraph of Aviation Partners Boeing Alert Service Bulletin AP757-53-006, dated May 7, 2024, refer to the original issue date of Requirements Bulletin 757-53A0123 RB, this AD requires using the effective date of this AD. (4) Where Aviation Partners Boeing Alert Service Bulletin AP757-53-006, dated May 7, 2024, specifies contacting Boeing for repair instructions or for alternative inspections: This AD requires doing the repair, or doing the alternative inspections and applicable on-condition actions using a method approved in accordance with the procedures specified in paragraph (i) 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)(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 Wayne Ha, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 562-627-5238; email: 
                        *wayne.ha@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 757-53A0123 RB, dated March 13, 2024. (ii) Aviation Partners Boeing Alert Service Bulletin AP757-53-006, dated May 7, 2024. (3) For the 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) For the Aviation Partners Boeing material identified in this AD, contact Aviation Partners Boeing, 2811 South 102nd St., Suite 200, Seattle, WA 98168; telephone 206-830-7699; fax 206-767-0535; email 
                        *leng@aviation partners.com*; website 
                        *aviationpartnersboeing.com*. (5) 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. (6) 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 27, 2025. Suzanne Masterson, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service.


[FR Doc. 2025-01973 Filed 1-30-25; 8:45 am] BILLING CODE 4910-13-P