APU Flashcards
When does the APU external flap open?
When APU master witch is pushed ON
When is the APU ECAM page displayed?
When pressing APU master switch ON with Ground or generator power connected
What is the APU fuel supply?
Left side of the fuel system, through normal tank pumps if available
When will the APU fuel pump run?
If no fuel pressure is available on the left side
What controls and monitors automatic APU operation?
Electronic Control Box (ECB)
Which bleed supply has priority, Engine or APU?
APU
When will the AVAIL light on the APU start switch illuminate?
When APU N is >99,5% or >95% for 2 seconds.
What is the meaning of amber XX over the bleed pressure indication on ECAM?
- ADIRS 1 or 2 data not available or OFF
- Invalid ECB data
What is the redline N for the APU which will trigger an automatic shutdown?
107% N
When can the APU “LOW OIL LEVEL” advisory be displayed on the ECAM page?
Only on the ground with the APU NOT running
To which altitude can the APU provide electrical power?
To the airplane max certified altitude
What is the APU battery restart limit altitude?
25.000’
What is the normal APU maximum restart altitude?
Airplane max certified altitude
What is the maximum altitude for single pack operation from the APU bleed?
20.000’ (22.500’ NEO)
What is the maximum altitude for dual pack operation from the APU bleed?
15.000’
