Sikorsky Aircraft Corporation Model S-76A, B, and C Helicopters Airworthiness Directive Amendment

Summary

The Federal Aviation Administration (FAA) has issued an airworthiness directive (AD) for Sikorsky Aircraft Corporation Model S-76A, B, and C helicopters, requiring inspections of Woodward HRT main rotor servo actuators and replacement with new servo actuators featuring redesigned piston seals. The move follows a National Transportation Safety Board (NTSB) safety recommendation stemming from an accident involving a Model S-76C helicopter.