2025-11206

Document Headings Document headings vary by document type but may contain the following: • the agency or agencies that issued and signed a document • the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to • the agency docket number / agency internal file number • the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Transportation Federal Aviation Administration • 14 CFR Part 39 • [Docket No. FAA-2024-2712; Project Identifier AD-2024-00145-E; Amendment 39-23066; AD 2025-12-08] • RIN 2120-AA64 AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) Model CF34-8C1, CF34-8C5, CF34-8C5A1, CF34-8C5A2, CF34-8C5A3, CF34-8C5B1, CF34-8E2, CF34-8E2A1, CF34-8E5, CF34-8E5A1, CF34-8E5A2, CF34-8E6, and CF34-8E6A1 engines. This AD was prompted by a predicted reduction in the cyclic life of the combustion chamber assembly (CCA) forward flange. This AD requires fluorescent penetrant inspections (FPIs) of the CCA for any indications and replacement if necessary. The FAA is issuing this AD to address the unsafe condition on these products. DATES: This AD is effective July 23, 2025. ADDRESSES: AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAAFAA-2024-2712; 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. FOR FURTHER INFORMATION CONTACT: Alexei Marqueen, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238-7178; email: alexei.t.marqueen@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 certain GE Model CF34-8C1, CF34-8C5, CF34-8C5A1, CF34-8C5A2, CF34-8C5A3, CF34-8C5B1, CF34-8E2, CF34-8E2A1, CF34-8E5, CF34-8E5A1, CF34-8E5A2, CF34-8E6, and CF34-8E6A1 engines. The NPRM was published in the Federal Register on December 27, 2024 (89 FR 105483). The NPRM was prompted by a predicted reduction in the cyclic life of the CCA forward flange. In the NPRM, the FAA proposed to require FPIs of the CCA for any indications and replacement if necessary. The FAA is issuing this AD to address the unsafe condition on these products. Discussion of Final Airworthiness Directive Comments The FAA received comments from four commenters. The commenters were the Air Line Pilots Association, International (ALPA), Fuji Dream Airlines, Horizon Air, and Japan Airlines. The following presents the comments received on the NPRM and the FAA's response to each comment. Support for the NPRM ALPA expressed support for the proposed AD. Request for Clarification of Procedures for FPI of the CCA Fuji Dream Airlines and Horizon Air requested that the FAA clarify the procedure for the FPI of the CCA in the NPRM. Fuji Dream Airlines proposed that the FAA revise paragraphs (g)(3) and (5) of the proposed AD to include reference to Paragraph 3., “Accomplishment Instructions” of GE CF34-8E Service Bulletin (SB) 72-A0250, dated May 1, 2024 (GE SB 72- ( printed page 25885) A0250, dated May 1, 2024…

Fonte: Federal Register (federalregister.gov). Texto original em inglês. Conteúdo sanitizado por segurança.