APU

Question 1

What two(three) methods will lead to an APU emergency shutdown

Answer 1

Fire switch in cockpit, or switch on external panel (automatic during fire on ground)

Question 2

If both engines are running, what will happen in the bleed system if APU bleed is turned on

Answer 2

Both eng bleed valves will close, xfeed valve will open, APU bleed will feed both sides

Question 3

When does APU Nspeed turn amber and red

Answer 3

Amber >102, red >107 (plus automatic shutdown)

Question 4

If you get the low oil message on the APU ECAM page, what should you do

Answer 4

Can continue normal ops, for another 10h

Question 5

What does an amber egt mean on the APU page

Answer 5

Reached egt max temp minus 33 degrees

Question 6

What are the alt limitations for the APU
1. Elec power
2. Single pack
3. Two packs
4. Ground operations

Answer 6

1. To max
2. 22,500 (FCOM 20,000)
3. 15,000
4. 14,500

Question 7

What is the APU start cycle

Answer 7

3 starts then 60 min cooloff

Question 8

What will happen if the APU was used for bleed air and you shut it down

Answer 8

It will continue to run for around 60 secs (wait until flap closes before turning off batt)