Summary
The FAA proposes to supersede an existing airworthiness directive (AD) for certain McCauley Propeller Systems propeller assemblies. That AD currently requires removing certain propeller hubs from service at new, reduced life limits and eddy current inspections (ECIs) of the propeller hub. This proposed AD would require removing certain propeller hubs from service before they exceed 6,000 hours time-since-new (TSN). This proposed AD results from a report of a crack in a propeller hub. We are proposing this AD to prevent cracked propeller hubs, which could cause failure of the propeller hub, blade separation, and loss of control of the airplane.