Turning props backwards....
I operate a piston engined aircraft fitted with Lycoming 290 hp IO-540 engines. The aircraft has a "Wet" Vac pump system.
As such I turn the props backwards to dress them just in case of live mags etc (which I usually check on shutdown anyway).
Somebody the other day was suggesting that this procedure is not correct, and may harm the engine in some way. What would come from this?
So far no-one (engineer or otherwise) has been able to give me a straight answer - for this aircraft type with the above engine/vac pumps.
Cheers
CS