Machinery & Equipment
Auxiliary Power Units (APU)
An auxiliary power unit, also known as (APU), is a device on a vehicle or aircraft that provides energy for functions other than propulsion. They are employed in aircraft, ships, and some land vehicles to perform tasks such as starting main engines, heating motor blocks, and charging batteries. The devices supply energy in electric, pneumatic, or hydraulic form.
- Types
- Aircraft APU · Vehicle APU
- Applications
- Civil · Military
5 editions22 December 2025