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

Summary

The Federal Aviation Administration (FAA) has issued an airworthiness directive amendment for Sikorsky Model S-76B and S-76C helicopters, requiring modifications to the electrical power distribution system to prevent a failure of the attitude and heading reference system (AHRS) due to a loss of essential bus power, which could lead to loss of control of the helicopter.