AD NUMBER: 2017-19-01

PRODUCT: Sikorsky Aircraft Corporation (Sikorsky) Model S-76A, S-76B, S-76C, and S-76D helicopters.

ACTION: Final Rule.

SUMMARY: This AD requires inspecting the main rotor (M/R) servo pushrod (pushrod) assembly and applying slippage marks.

This AD was prompted by an accident of a Sikorsky Model S-76C helicopter caused by a failed pushrod assembly.

The actions of this AD are intended to prevent an unsafe condition on these products.

COST: The FAA estimates that this AD affects 198 helicopters of U.S. Registry.

Labor costs are estimated at $85 per work-hour. Inspecting the M/R pushrod assemblies takes about 2.2 work-hours for an estimated cost of $187 per helicopter and $37,026 for the U.S. fleet. Replacing an M/R pushrod assembly takes about 2 work-hours for a labor cost of $170. Parts to replace M/R pushrod assembly P/N 76400-00034-059 cost about $2,411 for a total estimated replacement cost of $2,581.

Parts to replace M/R pushrod assembly P/N 76400-00014-074 cost about $2,224 for a total estimated replacement cost of $2,394. Parts to replace M/R pushrod assembly P/N 76400-00014-076 cost about $2,488 for a total estimated replacement cost of $2,658. Parts to replace M/R pushrod assembly P/N 76400-00014-077 cost about $2,414 for a total estimated replacement cost of $2,584. It takes a minimal amount of time to apply the slippage marks for a negligible cost.

DATES: This AD is effective January 2, 2018.

FMI: AD