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FAA Proposes Superseding Airworthiness Directive for Various Helicopters

The FAA proposes to supersede Airworthiness Directive (AD) 2015-20-12, which applies to Sikorsky, Croman Corporation, Carson Helicopters, Robinson Air Crane, Glacier Helicopter, and Siller Helicopters Model helicopters with certain main rotor shaft (MRS) part numbers installed. The proposed AD would retain existing requirements while also establishing retirement lives for each REL MRS, reducing life limits based on a design re-evaluation, and requiring removal of any MRS with oversized dowel pin bores.