An Auxiliary Power Unit (APU) is a small turbine engine providing secondary power to an aircraft, primarily on the ground, to start main engines, generate electricity for onboard systems, and power ...

Auxiliary power units (APUs) do their dull and dirty work hidden away in aircraft tailcone compartments, unlike their turbine engine brethren connected to the wings or empennage. On occasion however, ...

The U.S. government bailout package for Wall Street includes an exemption from the excise tax for auxiliary power units. The exemption would apply to new APUs when they are bought with new trucks. New ...