- A separate turbine that is not mechanically connected to the remainder of the engine, as for example in some turboprop engines that drive the propeller. Arrangements have to be made for braking the propeller, to prevent it from spinning in a wind when the aircraft is at rest, and for shutting off the fuel when the power turbine is unloaded. See also free power turbine.Free turbine in a turboprop engine.
Aviation dictionary. 2014.
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