Originally Posted by
SLFMS
So if you are unable to unable to feather the prop then all the engine components keep spinning?
No. It's a free turbine. The only items driven by the Power Turbine on most PT6 fixed wing are the prop gov, PT ovspd gov, and PT tach/gen. Everything else is driven by the Compressor Turbine. My guess the reason for the AT igniter delay is more airframe electrical system related than anything else.