What happens to Battery 1 during APU start?

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Multiple Choice

What happens to Battery 1 during APU start?

Explanation:
During APU start, Battery 1 is disconnected from the main electrical load by opening its contactor. This keeps Battery 1 from supplying the load buses while the APU is starting, preventing the batteries from being loaded by aircraft systems and ensuring the APU start circuit has a clean, reliable power source. Once the APU is up and generating, the loads are powered by the APU/generator, and charging paths can resume as designed. This isolation is the reason this option is correct.

During APU start, Battery 1 is disconnected from the main electrical load by opening its contactor. This keeps Battery 1 from supplying the load buses while the APU is starting, preventing the batteries from being loaded by aircraft systems and ensuring the APU start circuit has a clean, reliable power source. Once the APU is up and generating, the loads are powered by the APU/generator, and charging paths can resume as designed. This isolation is the reason this option is correct.

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