Airworthiness Directive · Amendment 39-10161 · General Electric Company CT58 Series Turboshaft Engines
General Electric Company CT58 Series Turboshaft Engines
General Electric Company (GE) Models CT58-110-1, -110-2, -140-1, and -140-2, and T58-GE-3/-5/-8F/-10/-100 series turboshaft engines, with stage 1 forward cooling plate, Part Number (P/N) 37C300055P101, stage 2 forward cooling plate, P/N 3000T88P02, and stage 2 aft cooling plate, P/N 3002T27P01, installed. These engines are installed on but not limited to Boeing Vertol 107 series, and Sikorsky S61 and S62 series aircraft.
This amendment adopts a new airworthiness directive (AD), applicable to General Electric Company CT58 series turboshaft engines, that requires removal from service of certain stage 1 and 2 forward cooling plates, and stage 2 aft cooling plates, and replacement with serviceable parts. This amendment is prompted by reports of certain cooling plates forged with contaminated alloy that could reduce the lives of the parts. The actions specified by this AD are intended to prevent cooling plate fracture, which could result in a contained engine failure, and an inflight engine shutdown.
