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CPL Test Series
Question Bank
Questions for Auxiliary Power Unit A320
Answer the following questions
Test Mode
Training Mode
1. If an APU start is initiated on battery power only, is fire protection available?
No
Yes
2. If APU bleed was used, after a manual shut down sequence, the APU:
Keeps running for 2 minutes
Keeps running for 4 minutes
Keeps running for 60 seconds
Stops immediately
3. When selected on, the APU START push button, will:
Connect the APU generator to the aircraft electrical system.
Open the air intake flap and supply fuel pressure.
Start the APU if the APU MASTER SW was previously selected ON.
4. On ground, can you start the APU using the aircraft batteries only?
No
Yes
5. The APU BLEED valve is automatically closed above ______ feet descending by the ECB.
26,000 feet
23,000 feet
29,000 feet
28,000 feet
6. On ground, the No Break Power Transfer function is inhibited in case of APU shutdown generated by which of the following conditions?
APU shut down from the REFUEL/DEFUEL panel or from the APU FIRE pushbutton.
APU shut down from emergency control provided on the external power panel.
All of the above.
Automatic APU shut down triggered by the ECB.
7. When the APU is running, the APU fuel pump:
Runs only in flight.
Runs when tank pumps pressure is not sufficient.
Runs when the APU fuel pump is selected on.
Runs all time
8. What is the maximum altitude at which the APU may be started using the batteries only?
25, 000 ft
15, 000 ft
39, 000 ft
20, 000 ft
9. Fire on ground or in flight will cause the APU MASTER SW pushbutton FAULT light to come on.
False
True
10. When the APU Master Switch is released, a normal APU shutdown occurs:
With a delay, in all cases.
With a delay if the bleed air was in use.
Without delay in all cases.
11. A FLAP OPEN indication is displayed in amber when the APU air inlet flaps is fully open
False
True
12. The APU has an integral independent lubrication system for lubrication and cooling.
False
True
13. The APU is supplied from the:
Left fuel feed line.
Right fuel feed line.
Left or right fuel line
14. The basic element of the APU is a single shaft gas turbine which delivers ______ power for driving the accessory gearbox (electrical generator) and produces bleed air (engine starting and pneumatic supply)
2nd stage turbine.
2nd stage compressor
Mechanical shaft
3rd stage turbine
15. The LOW OIL LEVEL advisory pulses in ____ if the APU oil quantity approaches its minimum value.
Red
Green
Amber
White
16. The APU may obtain power for starting from:
All of the above.
Normal aircraft supply.
The aircraft’s batteries or in combination with the external power.
Ground services.
17. The APU MASTER SW FAULT light will illuminate:
For an APU overheat or APU fire.
If the batteries are selected OFF while the APU is operating.
When an automatic shutdown of the APU occurs.
When APU low oil pressure is detected.
18. The APU cannot be shut down from outside the aircraft.
True
False
19. The Electronic Control Box (ECB) is primarily a full authority digital electronic controller that performs the APU system logic for all modes of APU operation such as:
All of the above.
Sequence and monitoring of start.
Monitoring of bleed air and shut down.
Speed and temperature monitoring.
20. The starter engages if the air intake is closed and the MASTER SW and the START pushbuttons are ON.
True
False
21. If an APU start is initiated on battery power only, is fire protection available?
Yes
No
22. A319/320/321. With the APU supplying bleed air what will be the pack flow if the PACK FLOW selector is LOW?
HIGH in all cases.
A319/320 – HIGH and A321 – NORMAL
A319/320 – NORMAL and A321 – HIGH
NORMAL in all cases
23. With battery power, what would an APU fire test look like?
Both are correct.
APU FIRE pushbutton illuminated.
SQUIB and DISCH lights illuminated
24. Can the APU FIRE test be performed with the APU running?
Yes
No
25. When the APU MASTER SW is selected ON:
The APU computer automatically completes a self-test, opens the air intake flap and supplies fuel pressure.
The APU door opens.
Connects the APU generator to the aircraft electrical system.
The APU computer automatically starts the APU.
26. How many APU fire extinguisher bottles are installed?
One
Two
One AC operated and one DC operated
27. The ECB (Electronic Control Box) controls the fuel flow.
False
True
28. The APU system page will appear on the ECAM:
Automatically whenever the APU is started and AC power is available.
When selected by the crew.
Both are correct.
29. Maximum altitude for APU bleed operation is:
1, 000 ft
22, 000 ft
15, 000 ft
20, 000 ft
30. What are some of the causes for an APU automatic shutdown?
Fire (on ground only), underspeed, overspeed, EGT overtemperature, Reverse flow, Low oil pressure, DC power loss.
Fire (on ground only), EGT overtemperature, Underspeed, Overspeed, low oil pressure, high oil pressure
Fire (on ground only), EGT overtemperature, Reverse flow, Overspeed, low oil pressure, high oil pressure
Fire (on ground only), EGT overtemperature, No acceleration, low oil pressure.
31. BAT 1 and 2 push buttons do not need to be selected ON if external power is available.
When selected OFF, the APU generator is de-energized.
Both are correct.
It is normally left in the lights out position.
32. Can the APU be used with wing anti-ice on?
Yes, but the altitude of utilization is limited to 15, 000 ft.
Yes, except during approach and go-around.
No.
Yes, but only for electrical power. The APU bleed valve should not be opened while using wing anti-ice.
33. With the engines off, if the AVAIL light is illuminated on both the APU START push button and the EXT PWR push button, what is the source of electrical power for the aircraft busses?
It is not possible to determine without checking the ECAM.
The APU.
The aircraft batteries
External power
34. To start the APU the
BAT 1 and 2 push buttons must be selected to ON.
BAT 1 and 2 push buttons do not need to be selected ON if external power is available.
Both are correct.
35. Will the APU bleed valve close automatically during climb? Will it reopen during descent?
Yes
No
36. What is the maximum operating altitude of the APU?
30,000 feet
25,000 feet
39,000 feet
35,000 feet
37. With nobody in the cockpit, if you have an APU FIRE, which statement is correct?
On the ground an APU AUTO shut down will occur but you have to discharge the APU fire bottle manually.
On the ground, an APU EMER shut down will occur and the APU fire bottle will be discharged automatically.
In the air, an APU EMER shut down will occur and the APU fire bottle will be discharged automatically.
On the ground, you have to perform the ECAM actions to shut down the APU and extinguish the fire from the cockpit.
38. With battery power only, what would an APU fire test look like?
SQUIB + DISCH lights illuminated
APU FIRE pb illuminated
APU FIRE pb illuminated and SQUIB + DISCH lights illuminated
39. The APU may be started up to what altitude?
The APU can be started up to 30,000 feet using only the aircraft batteries.
The APU can be started up to 35,000 feet using only the aircraft batteries.
The APU can be started at any altitude using normal aircraft electrical power.
The APU can be started up to 25,000 feet using only the aircraft batteries.
40. When starting the APU, the FUEL LO PR indication appears amber when an APU fuel low pressure is detected.
True
False
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