auxiliary power unit
Noun
Meaning
auxiliary power unit (plural auxiliary power units)
(aviation) A generator in aircraft or other vehicles for providing electric power to various systems, such as lighting, especially when the main engines are not running.
Examples
A simple auxiliary power unit can allow a trolleybus to get around a route blockage or can reduce the amount (or complexity) of overhead wiring needed at operating garages (depots).
Other modifications to the aircraft also included installing an auxiliary power unit, crew luggage compartment, sensor operator console, flight following console and upgraded avionics.
The auxiliary power unit enables the aircraft to start engines and provides electrical power and cabin heat independent of ground support equipment.
The vehicle also contains a 2-stroke diesel powered auxiliary power unit that can power all non-automotive energy requirements on the Field Artillery Ammunition Supply Vehicle and on the howitzer when a slave cable is used to connect the two.