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

Summary

The Federal Aviation Administration (FAA) has issued an airworthiness directive (AD) for Sikorsky Aircraft Corporation's Model S-76A, S-76B, and S-76C helicopters, requiring the removal and inspection of main rotor spindle attachment bolts to prevent incorrect bolt installation, which could lead to reduced hub or bolt fatigue life, separation of the main rotor blade, and loss of helicopter control.