APU

Question 1

Start Sequence APU with EXT PWR

Answer 1

APU Master………….ON
(Wait at least 3s)
APU START ………….ON

Question 2

During Fueling, APU operations restricted to:

Answer 2

1- Fuel Spill occurs…… Normal APU Shutdown
2- Don’t start if APU Fail/ Emergency Shutdown

Question 3

APU start attempt are limited to?

Answer 3

3 consecutive, wait 60 min for new start
(FCOM>LIM>APU>General)

Question 4

APU
1- Max Altitude to assist engine start?
2- Max Altitude for A/C + Pressurization?

Answer 4

1- 20 000ft
2- 20 000ft (Single Pack Ops) C-GEZX
22 500ft (Single Pack Ops)
15 000ft (Dual Pack Ops)

(FCOM>LIM>APU>Operational Envelope)

Question 5

APU N Speed Limit?

Answer 5

107%

Question 6

APU EGT Limit? C-GEZX

Answer 6

900C for Start below 25 000ft
982C for Start above 25 000ft
682C running 5 sec to shutdown
700-742C running for immediate shutdown

Question 7

APU EGT Limit?

Answer 7

1090C for Start below 35 000ft
1120C for Start above 35 000ft
675C for running

Question 8

APU Manual Shutdown?

Answer 8

MASTER SW………..OFF
AVAIL Light goes out
(If using bleed, cooling period of 60-120 sec)
** At 7%, Air Inlet Flap Closes

Question 9

APU Start Sequence?

Answer 9

MASTER SW………… ON
*Wait 3 sec before start, Power up test

START SW…………….ON

-Air Intake flap Opens
-Fuel Isolation Valves Opens
-Fuel pump operates if no fuel pressure from left tank

Question 10

When does blue light ON goes out on START pb?

Answer 10

2 sec after N reaches 95%

           OR

N above 99.5%

Question 11

When does AVAIL light come on START pb?

Answer 11

C-GEZX

N above 99.5% or 2 sec after 95%

——————————————-

N above 95%

Question 12

How much time should we wait to turn on APU bleed? (Airbus recommendation)

Answer 12

3 min after APU Start

Question 13

How much time should we wait to turn on APU bleed? (Airbus recommendation)

Answer 13

3 min after APU Start