EASA AD US-2021-08-18
Landing Gear - Main Landing Gear Assembly / Nose Landing Gear Kit - Inspection
Summary
Airworthiness Directive 2021-08-18 is a final rule issued by the Federal Aviation Administration affecting Sikorsky Aircraft Corporation Model S-92A helicopters. It addresses inspection and removal of certain main landing gear (MLG) and nose landing gear (NLG) components with non-conforming threads to ensure continued airworthiness and safety. The directive corrects previously published part number errors related to hinge pins and actuator pins.
What Changed
This AD supersedes AD 2021-04-16 by correcting erroneous part numbers for actuator pins in the inspection and installation prohibition requirements. It retains the original inspection and removal requirements but clarifies the correct part numbers to prevent confusion and ensure proper compliance.
Why It Matters
This directive is critical for aviation professionals because it prevents potential failure of landing gear components that could compromise helicopter control during landing. Operators and maintenance teams must accurately identify affected parts to avoid installation of unsafe components, thereby maintaining flight safety and regulatory compliance.
What To Do
Operators of Sikorsky Model S-92A helicopters must perform a one-time visual inspection of the right and left main landing gear assemblies and the nose landing gear kit within 300 hours time-in-service after April 29, 2021. Any affected threaded hinge pins or actuator pins identified by specified serial numbers must be removed from service before further flight. Installation of these affected parts is prohibited from the effective date of this AD.
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