Which device is used to provide bleed air on the ground when engines are not running?

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Multiple Choice

Which device is used to provide bleed air on the ground when engines are not running?

Explanation:
Bleed air on the ground when engines aren’t running comes from the Auxiliary Power Unit. The APU is a small on-board turbine that can produce compressed air (bleed air) in addition to electrical power. That bleed air can feed the aircraft’s pneumatic systems—such as the air conditioning packs and engine starting system—without needing the engines to spool up. External ground power units and standby generators provide electrical power, not pneumatic bleed air. A hydraulic accumulator stores hydraulic energy, not air. So the APU is the appropriate source for ground bleed air.

Bleed air on the ground when engines aren’t running comes from the Auxiliary Power Unit. The APU is a small on-board turbine that can produce compressed air (bleed air) in addition to electrical power. That bleed air can feed the aircraft’s pneumatic systems—such as the air conditioning packs and engine starting system—without needing the engines to spool up.

External ground power units and standby generators provide electrical power, not pneumatic bleed air. A hydraulic accumulator stores hydraulic energy, not air. So the APU is the appropriate source for ground bleed air.

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