待翻譯：Airworthiness Directive: Cracks in Fuselage of Boeing 737-8, 737-9, and 737-8200

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View Document Airworthiness Directives; The Boeing Company Airplanes Agencies Department of Transportation Federal Aviation Administration Agency/Docket Numbers Docket No. FAA-2025-3985 Project Identifier AD-2025-00493-T Amendment 39-23423 AD 2026-15-11 CFR 14 CFR 39 Document Citation 91 FR 50698 Document Number 2026-15936 Document Type Rule Pages 50698-50701 (4 pages) Publication Date 08/06/2026 RIN 2120-AA64 View printed version (PDF) Document Details Agencies Department of Transportation Federal Aviation Administration Agency/Docket Numbers Docket No. FAA-2025-3985 Project Identifier AD-2025-00493-T Amendment 39-23423 AD 2026-15-11 CFR 14 CFR 39 Document Citation 91 FR 50698 Document Number 2026-15936 Document Type Rule Pages 50698-50701 (4 pages) Publication Date 08/06/2026 RIN 2120-AA64 Document Dates Effective Date 2026-09-10 Dates Text This AD is effective September 10, 2026. Table of Contents This table of contents is a navigational tool, processed from the headings within the legal text of Federal Register documents. This repetition of headings to form internal navigation links has no substantive legal effect. AGENCY: ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: Background Discussion of Final Airworthiness Directive Comments Request To Explain How the Root Cause Is Addressed Request To Clarify Whether Certain Repairs Apply to Condition 1 Conclusion Material Incorporated by Reference Under 1 CFR Part 51 Costs of Compliance Authority for This Rulemaking Regulatory Findings List of Subjects in 14 CFR Part 39 The Amendment PART 39—AIRWORTHINESS DIRECTIVES (a) Effective Date (b) Affected ADs (c) Applicability (d) Subject (e) Unsafe Condition (f) Compliance (g) Required Actions (h) Exceptions to Requirements Bulletin Specifications (i) Alternative Methods of Compliance (AMOCs) (j) Additional Information (k) Material Incorporated by Reference Related Documents FederalRegister.gov uses the agency dockets published with the document to display related documents. Project Identifier AD-2025-00493-T (2 Documents) Date Action Title 08/06/2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes 11/25/2025 Notice of proposed rulemaking (NPRM). Airworthiness Directives; The Boeing Company Airplanes Docket No. FAA-2025-3985 (2 Documents) Date Action Title 08/06/2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes 11/25/2025 Notice of proposed rulemaking (NPRM). Airworthiness Directives; The Boeing Company Airplanes Public Comments Comments are no longer being accepted. See DATES for details. Regulations.gov Data Additional information is not currently available for this document. Sharing Shorter Document URL https://www.federalregister.gov/d/2026-15936 Email Email this document to a friend Print Print this document Document Statistics Document page views are updated periodically throughout the day and are cumulative counts for this document. Counts are subject to sampling, reprocessing and revision (up or down) throughout the day. 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Department of Transportation Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2025-3985; Project Identifier AD-2025-00493-T; Amendment 39-23423; AD 2026-15-11] RIN 2120-AA64 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 737-8, 737-9, and 737-8200 airplanes. This AD was prompted by reports of cracks in the bear strap at the forward upper ( printed page 50699) corner of the forward galley door cutout. This AD requires an inspection of the fuselage skin for existing repairs and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products. DATES: This AD is effective September 10, 2026. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of September 10, 2026. ADDRESSES: AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA-2025-3985; 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 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; websitemyboeingfleet.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 atregulations.gov under Docket No. FAA-2025-3985. FOR FURTHER INFORMATION CONTACT: Luis Cortez-Muniz, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3958; email: [email protected]. 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 certain The Boeing Company Model 737-8, 737-9, and 737-8200 airplanes. The NPRM was published in the Federal Register on November 25, 2025 (90 FR 53245). The NPRM was prompted by reports of cracks in the bear strap at the forward upper corner of the forward galley door cutout. In the NPRM, the FAA proposed to require an inspection of the fuselage skin for existing repairs and applicable on-condition actions. The FAA is issuing this AD to address cracks in the fuselage skin and bear strap, which may lead to the inability of the principal structural element to sustain limit loads and adversely affect the structural integrity of the airplane. Discussion of Final Airworthiness Directive Comments The FAA received comments from The Boeing Company who supported the NPRM without change. The FAA received additional comments from two commenters, including The Foundation for Aviation Safety and United Airlines (United). The following presents the comments received on the NPRM and the FAA's response to each comment. Request To Explain How the Root Cause Is Addressed The Foundation for Aviation Safety asked what the FAA and Boeing are doing to address the root cause of the defect. The commenter also asked if a structural defect is important enough to immediately ground an airplane after it is detected, why is the inspection for defects not accomplished long before the proposed compliance time. The FAA is issuing this AD to address the unsafe condition on in-service airplanes. The required compliance times for the initial inspection and on-condition repetitive inspections and repair were established to ensure any crack is detected and repaired before the crack reaches critical length with multiple opportunities for detection. The rulemaking timeline was based on Boeing 737 fleet findings, supporting analysis, and the severity of the effect on the airplane ( i.e., safety consequences) if cracking propagates beyond a critical length. The FAA determined that the required actions and compliance times provide an acceptable level of safety. In addition, Boeing is introducing changes to the manufacturing process that address the root cause of the unsafe condition on in-production airplanes. Request To Clarify Whether Certain Repairs Apply to Condition 1 United stated that Table 1, Condition 1 of the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737-53A1408 RB, dated December 20, 2024, specifies to contact Boeing for alternative inspection instructions for any repair found during the general visual inspection of the fuselage skin. The commenter noted that Boeing Alert Service Bulletin 737-53A1408, dated December 20, 2024, does not provide guidance for repairs accomplished per the structural repair manual (SRM) limits in 737-8 and 737-9 SRM 53-00-01, for fuselage skin blend out and bear strap blend out repair. United requested clarification on whether repairs performed within allowable damage limits should be considered “repairs found” for the purposes of Table 1, or if such repairs may be treated as unrepaired areas, “no repair found.” The FAA notes that Condition 1 applies to any repair, which includes blend out repairs accomplished per the SRM within the allowable damage limits. Such blend out repairs need to be evaluated to determine whether the repetitive inspection interval specified in the service information provides an acceptable level of safety for those repairs. Depending on findings, it may be necessary to reduce the inspection interval. The FAA has not changed this AD in response to this comment. 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. 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