I'm trying to think what 5 levers you are thinking of. Obviously, throttle, prop, mixture. Carb heat is probably the 4th. The 5th is where things get a bit esot

I'm trying to think what 5 levers you are thinking of. Obviously, throttle, prop, mixture. Carb heat is probably the 4th. The 5th is where things get a bit esoteric, perhaps manual turbo waste gate (aka second throttle)? Ah, less esoteric, probably the cowl flaps.