Sikorsky Issues Airworthiness Directive for S-76A, S-76B, and S-76C Helicopters to Address Fatigue Cracks and Tail Rotor Issues

Summary

Sikorsky Aircraft Corporation has issued an airworthiness directive for its S-76A, S-76B, and S-76C helicopters to address fatigue cracks in the tail rotor vertical stabilizer aft spar assembly and to require recurring track-and-balance of the tail rotor, as well as installation of a vertical stabilizer modification kit.