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auxiliary power unit
Definição1
A power generation unit for operation of systems like hydraulic, air conditioning, electrical, and avionics. It may provide AC (alternate current) or DC (direct current) supply. The APU is normally used prior to starting the aircraft and for testing systems on the ground. In rare cases, it can provide some thrust in an emergency. Ground auxiliary power units provide current for starting engines.
Fonte1
KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
Português
unidade auxiliar de força
Imagem

 Auxiliary power unit from an Airbus 320 Series.

Auxiliary power unit from an Airbus 320 Series.

Fonte: http://en.wikipedia.org/wiki/File:APIC-Honeywell-APU-Airbus.jpg