Auxiliary power units are usually found on large aircraft and naval ships as well as some large land vehicles.
Auxiliary power unit.
Starting power for the main engines.
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Pneumatic power for cabin air conditioning systems.
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.
Shaft power for other pneumatic and hydraulic systems.
How an auxiliary power unit works.
The auxiliary power unit apu is a small gas turbine engine mounted in the tail cone of an aircraft to provide autonomous electrical and mechanical power for the following.