Which of the following statements correctly describes the external power specification?

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Multiple Choice

Which of the following statements correctly describes the external power specification?

The external power specification is about the voltage and type of power that can be supplied to the aircraft from a ground power source. For most general aviation airplanes, the electrical system is designed to run on 28 volts DC. Providing 28 V DC from an external power unit ensures the avionics, lighting, and other systems operate correctly with engines off, without damaging the DC bus or needing conversion. Using 24 V DC or 12 V DC isn’t the standard for this context, as they don’t match the aircraft’s primary DC bus in this typical setup. 110 V AC isn’t directly compatible with the DC electrical system and would require an inverter or conditioning equipment, which isn’t described as the standard external power specification for these airplanes.

The external power specification is about the voltage and type of power that can be supplied to the aircraft from a ground power source. For most general aviation airplanes, the electrical system is designed to run on 28 volts DC. Providing 28 V DC from an external power unit ensures the avionics, lighting, and other systems operate correctly with engines off, without damaging the DC bus or needing conversion.

Using 24 V DC or 12 V DC isn’t the standard for this context, as they don’t match the aircraft’s primary DC bus in this typical setup. 110 V AC isn’t directly compatible with the DC electrical system and would require an inverter or conditioning equipment, which isn’t described as the standard external power specification for these airplanes.

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