What is different about an APU battery start?

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Study for the A320 Systems Test. Test your understanding with interactive questions and expert explanations. Prepare thoroughly for your examination!

Multiple Choice

What is different about an APU battery start?

Explanation:
During an APU start powered by the aircraft battery, the ECAM does not display the APU page. The ECAM only shows APU status when the APU is able to provide meaningful data to the aircraft systems. A battery start spins up the APU using the battery, but no APU-generated power is yet feeding the essential buses, so there isn’t APU data to present on ECAM. Once the APU is running and supplying power, the ECAM can show APU information as normal.

During an APU start powered by the aircraft battery, the ECAM does not display the APU page. The ECAM only shows APU status when the APU is able to provide meaningful data to the aircraft systems. A battery start spins up the APU using the battery, but no APU-generated power is yet feeding the essential buses, so there isn’t APU data to present on ECAM. Once the APU is running and supplying power, the ECAM can show APU information as normal.

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