Auxiliary Power Unit (APU)
An Auxiliary Power Unit (APU) is a self-contained unit that provides power to an aircraft when the main engines are not running. It is typically located in the tail section of the aircraft and consists of a small turbine engine, generator, and other necessary components. The APU can provide power for various aircraft systems, including air conditioning, lighting, and avionics. It can also be used to start the main engines. The use of an APU can reduce the need for ground power and can provide backup power in case of an engine failure or other emergency situation.
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