P.A., In this context, I mean turboprop and turboshaft engines. The engine with the start warning to which I have referred is the Allison C-250, when installed as a turboprop in a Siai Marchetti 1019. I have flown the same engine as a turboshaft in a number of different helicopters, for which there is not a similarly worded placard.
I am a turbojet and turbofan neophyte! 'Never flown a jet.