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A type of turbine engine that does not (directly) propel an aircraft, but, rather, provides power for other systems.

A turboshaft engine, like a , is a type of turbine engine that extracts power from the turbine(s) rather than using the engine's exhaust for thrust; unlike a turboprop, a turboshaft does not use the turbine to drive a propeller (at least not directly; most types of have main rotors powered by turboshaft engines via a complicated transmission and mast assembly), but, rather, to power other aircraft systems. Many aircraft use a turboshaft engine as an , which can power the aircraft's s and electrical busses if the main engines aren't turned on (for instance, when the aircraft is parked at the gate), and can provide compressed air for starting the engines.

For more information, see Wikipedia.

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