2022-08562

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-2020-0692; Project Identifier MCAI-2019-00140-E; Amendment 39-22016; AD 2022-08-13] • 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) PT6A-34, -34B, -34AG, -114, and -114A model turboprop engines. This AD was prompted by several reports of low-time fractures of compressor turbine (CT) blades resulting in loss of power or in-flight shutdown (IFSD) of the engine. This AD requires replacement of certain CT vanes. This AD also requires removal from service of certain CT blades when these blades have been operated with certain CT vanes. The FAA is issuing this AD to address the unsafe condition on these products. DATES: This AD is effective May 27, 2022. ADDRESSES: Examining the AD Docket You may examine the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA-2020-0692; 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, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238-7146; fax: (781) 238-7199; 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 PT6A-34, -34B, -34AG, -114, and -114A model turboprop engines. The NPRM published in the Federal Register on August 17, 2020 (85 FR 49981). The NPRM was prompted by several reports of low-time fractures of CT blades resulting in loss of power or IFSD of the engine. In the NPRM, the FAA proposed to require replacement of certain CT vanes. The NPRM also proposed to require the removal from service of certain CT blades when these blades have been operated with certain CT vanes. The FAA is issuing this AD to address the unsafe condition on these products. Transport Canada, which is the aviation authority for Canada, has issued Transport Canada AD CF 2019-30R1, dated December 17, 2019 (referred to after this as “the MCAI”), to address the unsafe condition on these products. The MCAI states: There have been several reported events of low time CT blade fractures resulting in power loss/In-flight shutdown (IFSD) on post P&WC Service Bulletin (SB) 1669 configured PT6A-114 engines, featuring new CMSX-6 CT blades. In addition, relatively low time failures of Non-P&WC CT blades have also been reported on PT6A-34 and -114 series engines. In service data shows that these low time failures were reported on engines that had CT vanes installed that were repaired in accordance with repair specification number STI 72-50-254 held by Southwest Turbine Inc. (STI). Most of the affected engines are installed on single-engi…

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