Summary
The FAA proposes to adopt a new airworthiness directive (AD) for Hamilton Sundstrand (formerly Hamilton Standard Division of United Technologies Corporation) Model 14RF-19 propellers. This proposed AD would require replacing certain actuator yokes with improved actuator yokes. This proposed AD results from certain propeller system actuator yoke arms breaking during flight. We are proposing this AD to prevent actuator yoke arms breaking during flight, which could cause high propeller vibration, requiring the pilot to feather the propeller, and could contribute to reduced controllability of the airplane.