EASA AD US-2021-24-15
Tail Rotor Drive - Oil Cooler Blower Shaft Drive Ring Spline Teeth and Mating Area Spline Teeth - Inspection
Federal Register Volume 86, Number 237, Final Rule FAA Airworthiness Directive 2021-24-15 addresses Bell Textron Canada Limited Model 206L-1, 206L-3, and 206L-4 helicopters equipped with certain Air Comm Corporation air conditioning systems. This directive mandates inspection of the oil cooler blower shaft's drive ring spline teeth and mating spline teeth for deformation and fretting. It targets helicopters with specific Supplemental Type Certificate (STC) air conditioning system part numbers installed.
Airworthiness DirectiveMaintenanceSafety MgmtAir Comm Corporation CAA UK AAN 25273Bell 206Bell Textron Canada 206L-1Bell Textron Canada 206L-3Bell Textron Canada 206L-4