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632 - ATPL Question Bank in English - For a transport aeroplane with an APU approved to provide electrical power and pneumatic air on the ground, which is the most complete list of external ground services that it can replace?

Question 632 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot Licence

External electrical power, pneumatic air for engine starting, and pneumatic air for air conditioning
Ground power unit.
Ground power unit, the starting system.
Ground power unit, the air conditioning unit.

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