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AD: Sikorsky Aircraft Corporation Helicopters

AD NUMBER:  2015-19-51

PRODUCT: Sikorsky Aircraft Corporation Model S-76A, S-76B, S-76C, and S-76D helicopters, which was sent previously to all known U.S. owners and operators of these helicopters.

ACTION: Final Rule; request for comments

SUMMARY: This AD requires inspecting the main rotor (M/R) and tail rotor (T/R) pushrod assemblies and the jamnuts, and applying slippage marks across the pushrod tubes and jamnuts. This AD is prompted by an accident of a Sikorsky Aircraft Corporation Model S-76C helicopter. During preliminary investigation, a failed pushrod assembly was identified.

These actions are intended to prevent loss of M/R or T/R flight control and subsequent loss of control of the helicopter.

DATES: This AD becomes effective November 10, 2015 to all persons except those persons to whom it was made immediately effective by Emergency AD 2015-19-51, issued on September 14, 2015, which contains the requirements of this AD. Comments must be received by December 28, 2015.

FMI: AD

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