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final rule

Airworthiness Directives; Sikorsky Model R-4B AAF Helicopter

Unsafe Condition: The increased overhang of the tail rotor gearbox causes an unsafe load distribution on the aft boom.

Category: aircraft Compliance: prior to November 15, 1947

Why matched: Airworthiness Directives; Sikorsky Model R-4B AAF Helicopter

final rule

Airworthiness Directives; Sikorsky Model R44-B Helicopter

Unsafe Condition: Failure of the main rotor links due to lack of lubrication causing loss of flight control.

Category: aircraft Compliance: before November 15, 1947

Why matched: Airworthiness Directives; Sikorsky Model R44-B Helicopter