SIKORSKY

Model S-92A helicopters [Docket No. FAA-2006-25444; Directorate Identifier 2006-SW-18-AD; Amendment 39-14700; AD 2006-15-19] - Requires, before further flight, replacing a certain main gearbox (MGB) upper main housing assembly that has 2,700 or more hours time-in-service (TIS) with an airworthy part...

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