APU

Definition	:	Auxiliary Power Unit
Category	:	Transport & Travel » Air Transport
Country/Region	:	Worldwide
Popularity	:

What does APU mean?

Auxiliary Power Unit (APU) is a device on an aircraft that act as an auxiliary power supply that powers the electrical systems of an aircraft. APU is a generators that works usually on a small turbine engine and provide an additional source of electrical power in the event of an engine generator failure. It can also be use to power on-board systems as well as a source of bleed air for air conditioning. Thus helps to avoid running the main engines when the aircraft is on the ground and save the fuel cost.