Back وحدة طاقة مساعدة Arabic APU Azerbaijani Unitat auxiliar de potència Catalan Auxiliary power unit Czech Hilfstriebwerk German Unidad de Potencia auxiliar Spanish واحد توان کمکی Persian Apuvoimalaite Finnish Groupe auxiliaire de puissance French Auxiliary Power Unit Frisian

Auxiliary power unit

A Honeywell GTCP36 APU mounted in the tail of a business jet
The APU exhaust in the tailcone of an Airbus A380

An auxiliary power unit (APU) is a device on a vehicle that provides energy for functions other than propulsion. They are commonly found on large aircraft, naval ships and on some large land vehicles. Aircraft APUs generally produce 115 V AC voltage at 400 Hz (rather than 50/60 Hz in mains supply), to run the electrical systems of the aircraft; others can produce 28 V DC voltage.[1] APUs can provide power through single or three-phase systems. A jet fuel starter (JFS) is a similar device to an APU but directly linked to the main engine and started by an onboard compressed air bottle.[2]

  1. ^ "400 Hz Electrical Systems". Ask a Rocket Scientist. Aerospaceweb.org.
  2. ^ A Jet Fuel Starter and Expendable Turbojet, ASME Digital Collection, by C Rodgers · 1986
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