An auxiliary power unit apu is a device on a vehicle that provides energy for functions other than propulsion they are commonly found on large aircraft and naval ships as well as some large land vehicles.
Auxiliary power unit.
Shaft power for other pneumatic and hydraulic systems.
Starting power for the main engines.
Pneumatic power for cabin air conditioning systems.
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Others can produce 28 v.
Auxiliary power units are usually found on large aircraft and naval ships as well as some large land vehicles.
Aircraft apus generally produce 115 v alternating current ac at 400 hz rather than 50 60 hz in mains supply to run the electrical systems of the aircraft.