What is the primary use of a ground power unit on the ramp?

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Multiple Choice

What is the primary use of a ground power unit on the ramp?

Explanation:
On the ramp, the ground power unit provides electrical power to the aircraft while its engines and APU are off. This lets cabin lights, environmental control, avionics, and preflight checks run without burning fuel or running the aircraft’s own power source. The GPU connects to the external power receptacle and delivers the correct voltage and frequency the aircraft needs, typically 400 Hz AC and/or 28 V DC. This is more efficient and reduces wear compared with using the APU for power. It isn’t used to deliver fuel or to provide passenger seating.

On the ramp, the ground power unit provides electrical power to the aircraft while its engines and APU are off. This lets cabin lights, environmental control, avionics, and preflight checks run without burning fuel or running the aircraft’s own power source. The GPU connects to the external power receptacle and delivers the correct voltage and frequency the aircraft needs, typically 400 Hz AC and/or 28 V DC. This is more efficient and reduces wear compared with using the APU for power. It isn’t used to deliver fuel or to provide passenger seating.

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