What does the APU stand for in aircraft systems?

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The term APU stands for Auxiliary Power Unit. This component is essential in aircraft systems as it serves as a secondary power source. The APU is typically used to supply electrical power and bleed air to start the main engines and to provide power for systems while the aircraft is on the ground, without needing to run the main engines.

Being a critical part of airport operations, the APU helps to ensure that systems like air conditioning, lighting, and avionics can operate even when the aircraft is stationary and not connected to ground power. This makes it invaluable for enabling pre-flight checks and maintaining comfort for passengers and crew during boarding and ground delays.

Other terms listed, such as Air Processing Unit, Aerodynamic Performance Unit, and Altitude Power Unit, do not accurately describe the function or purpose of the APU in aircraft systems, emphasizing the unique and specialized role of the Auxiliary Power Unit in aviation.

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