It doesn't cost anything to turn the ignition on
Hmmm....we did tng & circuits for 3 pilots an a then brandnew CJ2 and had the ignitors replaced at IIRC at 150 hrs. Did cost 650 USD a piece, 4 off em installed. After that, no tasinig on the aircraft they were not replaced until aircraft was sold at 1200hrs...
PT6s are totally different from the Garretts in the MU, and are in my opinion only in danger of flaming out at very unusual attitudes and low power settings.
My money is on V1......oops answer.
What on considers to be light or mod or severe trubulece OTOH varies wildly...