81 RULES: Sikorsky Aircraft Corp. Model S–92A Helicopters,
This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 20090753, which was sent previously to all known U.S. owners and operators of Sikorsky Aircraft Corporation (Sikorsky) Model S92A helicopters by individual letters. This amendment is prompted by the failure of 2 main gearbox filter bowl assembly
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