2023-15634

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-2023-0939; Project Identifier MCAI-2022-00743-E; Amendment 39-22513; AD 2023-15-01] • RIN 2120-AA64 AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada Corp. (P&WC) Model PW307D engines. This AD is prompted by a root cause analysis of an event involving an uncontained failure of a high-pressure turbine (HPT) 1st-stage disk, on an International Aero Engines AG (IAE) Model V2533-A5 engine, that resulted in high-energy debris penetrating the engine cowling and an aborted takeoff. This AD requires removing certain HPT 2nd-stage disks from service and also prohibits installation of certain HPT 2nd-stage disks on any affected engine. The FAA is issuing this AD to address the unsafe condition on these products. DATES: This AD is effective August 29, 2023. ADDRESSES: AD Docket: You may examine the AD docket at regulations.gov under Docket No.FAA-2023-0939; 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. FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (781) 238-7146; email: barbara.caufield@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 P&WC Model PW307D engines. The NPRM published in the Federal Register on May 11, 2023 (88 FR 30264). The NPRM was prompted by Transport Canada AD CF-2022-31, dated June 9, 2022, issued by Transport Canada, which is the aviation authority for Canada (referred to after this as the MCAI). The MCAI states that on March 18, 2020, an Airbus Model A321-231 airplane, powered by IAE Model V2533-A5 engines, experienced an uncontained HPT 1st-stage disk failure that resulted in an aborted takeoff and high-energy debris penetrating the engine cowling. In response to the March 2020 uncontained HPT 1st-stage disk failure, the FAA issued a series of ADs, including Emergency AD 2020-07-51, Amendment 39-21110 (85 FR 20402, April 13, 2020) (AD 2020-07-51). Since the FAA issued AD 2020-07-51, IAE determined that the failure of the V2533-A5 engine was due to an undetected subsurface material defect in the HPT 1st-stage disk that may affect the life of the part. In coordination with IAE, P&WC performed a records review and analysis of PW307A and PW307D engine parts made of similar material and identified two additional affected HPT 2nd-stage disks (S/Ns A004D8X1 and A004E9K3), installed on PW307D engines. These two additional HPT 2nd-stage disks may have a material defect which could reduce the life of the part. As such, the affected HPT 2nd-stage disks must be removed from service. In the NPRM, the FAA proposed to require removing certain part-numbered HPT …

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