Summary
The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to Hartzell Propeller Inc. model HC-C2YR-4CF propellers. This proposal would require the reduction of the original hub and blades certified service (fatigue) life from unlimited hours to 2,000 hours. This proposal is prompted by a reevaluation by Hartzell Propeller Inc. of the original hub and blades service life certification calculations. The actions specified by the proposed AD are intended to prevent fatigue failure of the original propeller hub and blades which may result in loss of airplane control.