Summary
The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to Dowty Aerospace Propellers, R354/4-123-F/13, R354/4-123-F/20, R375/4-123-F/21, R389/4-123-F/25, R389/4-123-F/26, and R390/4-123-F/27 propellers. This proposal would require a one-time inspection of the hub joint mating surfaces for fretting. This proposal is prompted by reports of fretting on the joint mating faces of propeller hubs. The actions specified by the proposed AD are intended to prevent failure of the hub due to loose hub through bolts.