2021-08327

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-2020-1116; Project Identifier AD-2020-00784-E; Amendment 39-21524; AD 2021-09-10] • RIN 2120-AA64 AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2012-04-15 for all Pratt & Whitney (PW) JT9D-3A, JT9D-7, JT9D-7A, JT9D-7AH, JT9D-7F, JT9D-7H, JT9D-7J, JT9D-7Q, JT9D-7Q3, JT9D-7R4D, JT9D-7R4D1, JT9D-7R4E, JT9D-7R4E1, JT9D-7R4E4, JT9D-7R4G2, JT9D-7R4H1, JT9D-20, JT9D-20J, JT9D-59A, and JT9D-70A (JT9D) model turbofan engines. AD 2012-04-15 required revisions to the Airworthiness Limitations Section (ALS) of the manufacturer's Instructions for Continued Airworthiness (ICA) to include required enhanced inspection of selected critical life-limited parts at each piece-part opportunity. AD 2012-04-15 also required additional revisions to the ALS of the manufacturer's ICA for JT9D model turbofan engines. This AD requires revising the required inspections of selected critical life-limited parts specified in the ALS of the manufacturer's ICA and, for air carriers, to the existing continuous airworthiness air carrier maintenance program (CAMP). The FAA is issuing this AD to address the unsafe condition on these products. DATES: This AD is effective May 27, 2021. ADDRESSES: Examining the AD Docket You may examine the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA-2020-1116; 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: Nicholas Paine, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238-7742; fax: (781) 238-7199; email: nicholas.j.paine@faa.gov. SUPPLEMENTARY INFORMATION: Background The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to supersede AD 2012-04-15, Amendment 39-16971 (77 FR 15939, March 19, 2012), (AD 2012-04-15). AD 2012-04-15 applied to all PW JT9D model turbofan engines. The NPRM published in the Federal Register on December 15, 2020 (85 FR 81162). The NPRM was prompted by the need to require enhanced inspection of selected critical life-limited parts of PW JT9D model turbofan engines. Since the FAA issued AD 2012-04-15, PW identified errors in the list of mandatory inspections to add to the ALS. During review of the AD, PW found that AD 2012-04-15 did not include eddy current inspections of the fan hubs. Additionally, PW identified duplicate inspections of the HPT Stage 2 disk tie rod and web cooling holes. In the NPRM, the FAA proposed to require revising the required inspections of selected critical life-limited parts specified in the ALS of the manufacturer's ICA and, for air carriers, to the existing CAMP. 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 two commenters. The commenters were Atlas Air Inc. (Atlas Air) and …

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