APU

Question 1

APU RUNNING (white status)

Answer 1

APU is at normal speed

You can push the STAT button to get APU operational performance on EICAS secondary

Question 2

How many packs can be on during engine start?

Answer 2

1 pack

Question 3

What is the config for an APU to pack takeoff?

Answer 3

Packs 1/3 off
APU bleed on
Pack 2 on

Question 4

Is it necessary to close the APU bleed valve before shutting down the APU?

Answer 4

No, it’s automatic. 2 min for APU fuel valve, inlet door and bleed air to close and cool down before turning batt off

Question 5

APU (advisory)

Answer 5

• APU auto shutdown
• APU N1 RPM >95% with APU switch in off.

If message is no longer displayed after turning APU off, you may restart. If not, no restart.

Question 6

APU DOOR (advisory)

Answer 6

NIPS

In flight, do checklist to ensure accurate fuel burn (2% penalty)

On the ground, attempt an APU start (May be able to clear by turning off then on)

Question 7

What happens if the TR overheats during the APU start?

What if it fails?

Answer 7

It auto transfers to the APU batt for start.

It will not auto transfer, you must switch it to APU batt to isolate the TR and do the start using the APU batt

Question 8

APU FUEL (advisory)

Answer 8

• low fuel pump press
• APU fuel valve NIPS

(QRH has you turn it off and no restart)