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Flashcards in APU Deck (10):
1

What causes an automatic EMER. SHUTDOWN of the APU? When is this facility available?

- APU fire on the ground.
- Pressing the APU fire on the exterior panel.

2

Why would the APU continue to run after being selected OFF?

If using APU bleed air, the APU keeps running for cooling period of 60sec.

3

What happens if excessive EGT is sensed?

FAULT amber light, and a caution appears on ECAM. Followed by an automatic shutdown.

4

AUTO SHUTDOWN is available during which phases of flight? And EMER SHUTDOWN (Fire)

1500’ – 800’

5

What causes the FLAP to OPEN? What does the message FLAP OPEN mean exactly?

- When MASTER SW p/b is pressed.
- In green when APU air intake flap is fully open.
- In amber after 3min APU has been switched OFF.

6

What happens if the START button is pressed immediately after the MASTER button is pressed?

- Green light comes on when N is >99.5% or 2sec after N reaches 95%
- APU can now be used for electrics and/or bleed

7

What is the Maximum altitude for APU start?

- 41,000’ by electrical power
- 25,000’ by battery only
- 14,500’ on the ground

8

What are the altitude limitations for the use of APU bleed & packs?

2 packs: 15,000’
1 pack: 22,500’

9

What would you do if the SD showed LO OIL LVL?

- Refill the oil
- Low APU oil when the aircraft is on the ground, and the APU is not running.
- The APU may be started ad operated even if the LOW OIL LEVEL ECAM advisory is displayed.
- Maintenance action is required within next 10hrs of APU operation.

10

What is the APU start limitation?

After 3 starter motor duty cycles, wait 60min before attempting 3 more cycles.