What conditions cause the APU system page to appear on the ECAM, and what happens if you switch off the APU but still have the APU available?
Understand the Problem
The question appears to be related to the functioning of the APU (Auxiliary Power Unit) in aviation, specifically regarding its operation and indications on the ECAM (Electronic Centralized Aircraft Monitor). It discusses scenarios where the APU system page appears, the implications of switching off the APU, and potential faults with the APU master switch.
Answer
APU page appears when APU is started and AC power is available; APU stays available for cooling after shutdown.
The APU system page appears on the ECAM when selected by the crew or automatically when the APU is started and AC power is available. If you switch off the APU but still have it available, the APU will run for a cooling period because the cooling process is necessary after shutdown.
Answer for screen readers
The APU system page appears on the ECAM when selected by the crew or automatically when the APU is started and AC power is available. If you switch off the APU but still have it available, the APU will run for a cooling period because the cooling process is necessary after shutdown.
More Information
The APU remains in operation for a brief period to ensure that all systems are cooled adequately and safely before complete shutdown.
Tips
Ensure the APU shutdown procedure is followed correctly to avoid issues.
Sources
- APU Flashcards by Chris Baines | Brainscape - brainscape.com
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