2021-26330

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-2021-0157; Project Identifier AD-2020-00483-T; Amendment 39-21806; AD 2021-23-08] • RIN 2120-AA64 AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: The FAA is adopting a new airworthiness directive (AD) for certain Learjet Inc. (Learjet) Model 45 airplanes. This AD was prompted by reports of corrosion found on the upper surface of the lower center wing mid spar splice plate. This AD requires repetitively inspecting the center wing area for corrosion and deterioration of protective treatments, removing any corrosion, and treating any deteriorated areas. The FAA is issuing this AD to address the unsafe condition on these products. DATES: This AD is effective January 10, 2022. The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of January 10, 2022. ADDRESSES: For service information identified in this final rule, contact Learjet Inc., One Learjet Way, Wichita, KS 67209; phone: (316) 946-2000; email: ac.ict@aero.bombardier.com; website: https://businessaircraft.bombardier.com/​en/​aircraft/​learjet.html. You may view this referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call (816) 329-4148. Examining the AD Docket You may examine the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-0157; 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: Tara Shawn, Aviation Safety Engineer, Wichita ACO Branch, FAA, 1801 Airport Road, Wichita, KS 67209; phone: (316) 946-4141; fax: (316) 946-4107; email: tara.shawn@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 serial numbered Learjet Inc. (Learjet) Model 45 (Learjet 40), Model 45 (Learjet 45), Model 45 (Learjet 70), and Model 45 (Learjet 75) airplanes. The NPRM published in the Federal Register on July 28, 2021 (86 FR 40379). The NPRM was prompted by a report from Learjet of corrosion found in the center wing area of a Model 45 (Learjet 45) airplane. Exfoliating corrosion was found on the upper surface of the lower center wing mid spar splice plate during unrelated maintenance. The corrosion appeared to extend half way through the thickness of the splice plate. Since the initial report, the FAA has received 23 additional reports of corrosion from Learjet. The FAA determined areas of the wing center section are not sealed against the elements; in addition, the fuselage has drain holes that allow condensation to drain into the cente…

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