During an APU battery start, which ECAM page is not displayed?

During an APU battery start, which ECAM page is not displayed?

• A. The ECAM APU page
• B. The ECAM ENG page
• C. The ECAM FUEL page
• D. The ECAM ELEC page

Answer: (A)

When the APU is being started from the APU battery, ECAM keeps visibility on the systems that matter most for the start and for power availability—the engines and the electrical buses. Since the APU is just in the process of starting and not yet supplying electrical power or bleed air, there isn’t a stable set of APU parameters to display. So the ECAM does not show the APU page during this start; it presents ENG and ELEC pages to monitor engine parameters and power status. The APU page would appear once the APU has successfully started and is supplying power, or if a fault is detected.

When the APU is being started from the APU battery, ECAM keeps visibility on the systems that matter most for the start and for power availability—the engines and the electrical buses. Since the APU is just in the process of starting and not yet supplying electrical power or bleed air, there isn’t a stable set of APU parameters to display. So the ECAM does not show the APU page during this start; it presents ENG and ELEC pages to monitor engine parameters and power status. The APU page would appear once the APU has successfully started and is supplying power, or if a fault is detected.