Fri, Mar 12, 2021
AD 2021-04-16 Requires A One-Time Inspection Of The Landing Gear
The FAA is adopting a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters.
This AD was prompted by the manufacturer discovering nonconforming threads, resulting in a life limit reduction on multiple landing gear components including threaded hinge pins and main landing gear (MLG) and nose landing gear (NLG) actuator pins. This AD requires a one-time inspection of the landing gear for components with non-conforming threads and removal of any nonconforming threaded hinge pin and MLG and NLG actuator pin. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective April 14, 2021.
Supplementary Information: The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to certain Sikorsky Model S-92A helicopters, with serial numbers (S/Ns) 920006 through 920334, inclusive. The NPRM published in the Federal Register on September 8, 2020 (85 FR 55388). The NPRM was prompted by the manufacturer discovering non-conforming threads, resulting in a life limit reduction on multiple landing gear components including threaded hinge pins and MLG and NLG actuator pins. In the NPRM, the FAA proposed to require a one-time inspection of the landing gear and the removal from service of certain serial-numbered threaded hinge pins part number (P/N) 92250-12281-101 and certain serial-numbered MLG and NLG actuator pins P/N 92250-12287-101 and 92250-12287-103. The FAA is issuing this AD to address the unsafe condition on these products.
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