AUXILIARY POWER UNIT

Question 1

What are the APU Manual shut down possibilities in the cockpit?

a. APU Master Switch Push Button; APU Fire Push Button Switch
b. APU Master Switch Push Button
c. APU Fire Push Button Switch; APU Shut Off Push Button

Answer 1

a. APU Master Switch Push Button; APU Fire Push Button Switch

Question 2

2. When the APU is running, the APU Fuel Pump:
   a. Runs when tank pumps pressure is not sufficient;
   b. Runs all the time;
   c. Runs only in flight;
   d. Runs when the APU fuel pump is selected ON.

Answer 2

a. Runs when tank pumps pressure is not sufficient;

Question 3

3. On ground, normal APU rotation speed (N%) without air conditioning is:
   a. 99% (101% for Engine Start)
   b. Steady at 99%
   c. Steady at 101%

Answer 3

a. 99% (101% for Engine Start)

Question 4

4. APU Master Switch selected “ON”:
   a. ON comes on BLUE, APU system is supplied and APU starts; at 95%, AVAIL comes ON;
   b. ON comes on BLUE; APU system is supplied; APU starts as soon as the START Push Button is pressed and Intake Flap opens.

Answer 4

b. ON comes on BLUE; APU system is supplied; APU starts as soon as the START Push Button is pressed and Intake Flap opens.

Question 5

5. APU Bleed Air is controlled:
   a. By ECB (N% Adjustment)
   b. Not Controlled
   c. By APU Bleed Valve which operates as Shut Off Valve.

Answer 5

a. By ECB (N% Adjustment)

Question 6

6. APU N indication becomes AMBER on ECAM SD whien:
   a. N > 107%
   b. N > 102%
   c. N > 99%

Answer 6

b. N > 102%

Question 7

7. APU EGT indication becomes RED on ECAM SD when:
   a. EGT > 715oC (APU Running)
   b. EGT > 1038oC (APU Running)

c. EGT > 711 (APU Running; OAT: 15oC (59oF); OP. EGT > 1038oC (During
APU start)

Answer 7

c. EGT > 711 (APU Running; OAT: 15oC (59oF); OP. EGT > 1038oC (During
APU start)

Question 8

8. On ground, APU provides:
   a. Electrical Power + Hydraulic Power
   b. Electrical Power + Bleed Air

Answer 8

b. Electrical Power + Bleed Air

Question 9

9. Air Bleed extraction for Wing Anti-Ice:
   a. is permitted
   b. is not permitted

Answer 9

b. is not permitted

Question 10

10. Can you start the APU using the A/C Batteries?
    a. Yes
    b. No

Answer 10

a. Yes

Question 11

11. The APU is supplied from the:
    a. Left Fuel Feed Line
    b. Right Fuel Feed Line

Answer 11

a. Left Fuel Feed Line

Question 12

12. If Air Bleed was used, after a Manual Shut Down
    Sequence, the APU:

a. stops immediately;
b. keeps running for four (4) minutes;
c. keeps running between 60 seconds and 120 seconds MAX.

Answer 12

c. keeps running between 60 seconds and 120 seconds MAX.

Question 13

13. AVAIL Light illuminates on start PB when:
    a. external power is disconnected;
    b. APU N reaches 95%;
    c. APU Electric Power is used.

Answer 13

b. APU N reaches 95%;

Question 14

14. The APU has its own lubrication system:
    a. Yes
    b. No

Answer 14

a. Yes

Question 15

15. On ground, the APU speed is determined in accordance with Air Bleed system demand by:
    a. Electronic Control Box
    b. Air Conditioning System (Zone Controller)
    c. Air Intake System

Answer 15

a. Electronic Control Box

Question 16

16. Besides the Master Switch on the cockpit APU panel, APU shut down is possible by:
    a. Switching Off the left fuel pumps;
    b. Pushing the APU Fire Push Button;
    c. Pressing APU Shut Off Push Button on external interphone panel;
    d. Either B or C.

Answer 16

d. Either B or C.

Question 17

17. When the APU Master Switch is released out, a normal APU Shut Down occurs:
    a. after a time delay, in all cases;
    b. after a time delay if the APU bleed air was in use;
    c. without time delay, in all cases.

Answer 17

b. after a time delay if the APU bleed air was in use;

Question 18

18. Master Switch ON, the:
    a. APU starts
    b. ECB is electrically supplied
    c. Air Intake Flap closes

Answer 18

b. ECB is electrically supplied