---
title: "Auxiliary power unit — aviation glossary — OnlyPlanes"
description: "A small gas turbine providing electrical power, air or engine-start support."
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  "og:title": "Auxiliary power unit — aviation glossary"
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Engines

# Auxiliary power unit

apu, Auxiliary Power Unit

TERM · Engines

At a glance

## Meaning of Auxiliary power unit

A small gas turbine providing electrical power, air or engine-start support.

### More about Auxiliary power unit

An APU supports aircraft systems, particularly on the ground, without requiring the main engines to run. Its exact capabilities depend on the installation.

It is not a main propulsion engine. Availability and permitted use vary with the aircraft's operating conditions and procedures.

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