Can Battery #1 be used to start the APU?

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Multiple Choice

Can Battery #1 be used to start the APU?

Explanation:
Starting the APU requires a high-current power source dedicated to the APU start motor. In this aircraft, Battery #1 is not routed to drive the APU starter; the APU start circuit is powered from Battery #2 (the APU/start battery) or from an external power source when available. Therefore Battery #1 alone cannot supply the necessary current to spin up the APU, regardless of whether there is GPU connection or a second battery assist. That’s why the correct answer is No.

Starting the APU requires a high-current power source dedicated to the APU start motor. In this aircraft, Battery #1 is not routed to drive the APU starter; the APU start circuit is powered from Battery #2 (the APU/start battery) or from an external power source when available. Therefore Battery #1 alone cannot supply the necessary current to spin up the APU, regardless of whether there is GPU connection or a second battery assist. That’s why the correct answer is No.

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