49 APU

Question 1

When does the APU AVAIL light show?

Answer 1

N >95%

Question 2

What does the small green triangle above the APU GEN on the APU SD page show?

Answer 2

APU line contactor (closed if green)

Question 3

When does the APU auto shutdown?

Answer 3

APU shut off switch on external power panel pushed, or
APU FIRE pb pushed, or
APU fire detected on ground, or
APU reaches relevant MAX EGT

Question 4

Where is the APU fuel fed from?

Answer 4

Left side tank pumps

Question 5

If the APU SD page shows “FLAP OPEN”, which flap is this?

Answer 5

Air intake flap

Question 6

How many hours of operation do you have on APU LOW OIL LEVEL?

Answer 6

10

Question 7

What is the APU battery restart altitude limit?

Answer 7

25000ft

Question 8

At what altitude is APU bleed air available with 1 pack?

Answer 8

22500ft

Question 9

At what altitude is APU bleed air available with 2 packs?

Answer 9

15000ft

Question 10

At what altitude can the APU be used to assist in restarting an engine?

Answer 10

20000ft

Question 11

After APU OFF, and APU BLEED was being used, how long will it take for the APU to fully shutdown and the flap to close?

Answer 11

2 minutes

(Cooling period after bleed air use is 60s to 120s)

Question 12

Can APU be used for anti ice?

Answer 12

No

Question 13

What is APU battery start ceiling?

Answer 13

25000ft

Question 14

What is max altitude to use APU to start engine?

Answer 14

20000ft

Question 15

APU max number of start cycles permitted?

Answer 15

3 followed by 1 hour cooldown

Question 16

APU fuel burn in flight?

Answer 16

50kg/hr