A receptical for external power is located aft of the nose wheel. The Auxiliary Power Unit (APU) is located under the Number 2 engine.
The APU can power the hydraulic, electrical and pneumatic system. It can warm or cool a static aircraft and have it ready for passenger loading in 20 or 30 minutes.
The APU is normally used on the ground, but if needed may be started and used in the air.
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