APU

Question 1

If you accidentally turn of the APU, what can you do to keep it running?

Answer 1

Move the selector to the ON position before the 1 minute cool down period is over.

Question 2

How many minutes before push back can you start the APU?

Answer 2

10 minutes

Question 3

If BATT 1 is deferred, what is required to start the APU?

Answer 3

APU will not start. BATT 1 has the brains of the APU

Question 4

If takeoff performance requires ECS off, how should we set the APU

Answer 4

ON to pressurize the cabin for takeoff

Question 5

Where does fuel come from for the APU is there is only DC power?

Answer 5

DC fuel pump in tank 2

Question 6

Where does fuel for the APU come from is there is AC power and no engines running?

Answer 6

AC fuel pump

Question 7

Where does fuel come from for the APU with engines running?

Answer 7

Ejector pump from tank 2

Question 8

Where can you get electrical power to start the APU?

Answer 8

BATT 2

DC GPU

Question 9

What happens if we press the APU emergency stop?

Answer 9

The fuel SOV is closed

Question 10

Why do we move switch to ON before starting the APU?

Answer 10

This turns on and initialize FADEC

Question 11

How do we know when the APU FADEC is ready?

Answer 11

There will be numbers on the EICAS

Question 12

What is our shut down consideration for the APU?

Answer 12

1 minute cool down / 1 minute spool down

Question 13

What do we need to consider if we are turning off the batters?

Answer 13

Ensure APU is completely shut down prior to turning batteries off (FADEC fault)
EICAS show OFF

Question 14

What can the APU provide durning the 1 minute cool down?

Answer 14

Provide AC electrical power until shut down. Bleed valve closes.

Question 15

What can we use the APU for?

Answer 15

Source of air and electrical power?

Question 16

What is the max altitude that the APU can provide AC power?

Answer 16

33,000 feet

Question 17

What is the max altitude for the APU to provide engine start?

Answer 17

21,000 feet

Question 18

What is the max altitude for APU bleed air use?

Answer 18

15,000 feet

Question 19

What is the max altitude to start the APU?

Answer 19

30,000 feet

Question 20

Can the APU provide bleed air for anti-ice?

Answer 20

No

Question 21

What will cause the APU to automatically shut down on the ground?

Answer 21

Overspeed 
Under speed
FADEC critical fault
APU fire
APU EGT over temp
APU high oil temp
APU low oil pressure 
Sensor fail

Question 22

What will cause the APU to automatically shut down in flight?

Answer 22

Overspeed
Under speed
FADEC critical fault