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A320
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A320 Neo

Auxiliary Power Unit


Airbus A320
Auxiliary Power Unit
(*Please refer the latest A320 Fcom, If any suggestion for improvement then please send us in comment box )
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1.       There is an external horn installed in the nose landing gear wheel well that sounds on ground when.
·         The Flight Crew presses MECH call pb, or APU Fire is detected.
·         ADIRS are supplied by aircraft battery.
·         Blowing air pressure in the Avionics Ventilation System is low.
·         All of the above are correct.

2.       As regards, APU ECAM Page.
·         APU FLAP OPEN is displayed in green when APU Master Switch ON and APU air intake flap is fully open.
·         LOW OIL LEVEL Advisory is displayed if APU OIL QTY is Low when a/c is on Ground and the APU is not running.
·         LOW OIL LEVEL Advisory is displayed if APU OIL QTY is Low when a/c is on Ground and the APU is running.
·         Both {A} & {B} above are correct.

3.       Which oil system warning causes APU auto shut down.
·         Low Oil Level, High Oil temp and low oil pressure.
·         Low Oil Level and Low Oil Pressure .
·         Low Oil Pressure and High Oil temp.
·         High Oil temp and Low Oil level.   

4.       What is the reason for APU EMER SHUT DOWN title on upper ECAM?
1)      APU AUTO Shut Down on ground.
2)      An APU fire is detected on ground.
3)      The ground crew shuts down the APU manually by pushing the APU SHUT OFF pb on the nose gear interphone panel.
4)      The flight crew presses the APU FIRE pb in the cockpit.

·         1
·         2,3,4
·         1,4
·         2

5.       You switch off the APU but you still have APU AVAIL indications.
      ·        There is a fault with the APU master switch.
      ·         This is normal as APU will run for a cooling period of 120 seconds.

6.       When the APU Master Switch is switched off, a normal APU shutdown occurs:
·         Without delay in all cases.
·         With a delay, in all cases.
·         With a delay if the bleed air was in use.

7.       With nobody in the cockpit, if you have an APU FIRE, which statement is correct?
·         On the ground, 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.
·         On the ground an APU AUTO shut down will occur but you have to discharge the APU fire bottle manually.
·         In the air, an APU EMER shut down will occur and the APU fire bottle will be discharged automatically.

8.        What  are the indications when APU reach 95%
·         AVAIL on START pb switch comes on and APU  ECAM page disappears after a little delay..
·         Along with {B}above, APU AVAIL memo comes on the upper ECAM also.

9.       What are the indications when the start sequence is completed.
·         AVAIL light illuminate on the start switch and ON light goes OFF
·         AVAIL indication comes on the APU page.
·         APU AVAIL memo is displayed.
·         All the above are correct.

10.   When APU START push button is selected on:
·         It starts the APU if the APU MASTER SW was previously selected ON.
·         The Green AVAIL light  comes on when N is above 99.5 % and Blue ON light goes off.
·         Both are correct.


11.   When does the APU ECAM page appear on SD?
·         As soon as  APU master switch is selected ON and aircraft is powered either by EXT PWR or by engine generator.
·         If an advisory condition arise related to APU.
·         Both are correct.

12.   During APU start, APU system page appears on the lower ECAM:
·        As soon as APU master switch is selected ON with either ground power or main generator power is used.
·        As soon as APU master switch ON, and starter button is pushed with ground power or main generator is used.

13.   You have to wait for 5 seconds after selecting Master Switch to ON and before selecting  Start pb to ON for APU Start.
·         True always weather you start APU with EXT PWR ON or OFF.
·         True only if EXT PWR OFF
·         True only if EXT PWR ON.

14.   The Electronic Control Box (ECB) is a computer that performs the APU system logic for all modes of APU operation such as:
·         Sequence and monitoring of start.
·         Speed and temperature monitoring.
·         Monitoring of bleed air and shut down.
·         All of the above.

15.   Maximum altitude for APU bleed operation is:
·         15, 000 ft
·         18, 000 ft
·         20, 000 ft
·         22, 000 ft


16.   APU generator load can be used upto                   
·         20,000 feet
·         25,000 feet
·         31,000 feet
·         39,000 feet


17.   What is the maximum altitude at which the APU may be started using the batteries only?
·         15, 000 ft
·         20, 000 ft
·         25, 000 ft
·         39, 000 ft


18.   The APU may be started up to what altitude?
·         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.
·         Both {A} & {B} are correct.

19.   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.

20.   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:
·           Sequence and monitoring of start.
·           Speed and temperature monitoring.
·           Monitoring of bleed air and shut down.
·           All of the above.

21.   When the APU Master Switch is released, a normal APU shutdown occurs:
·           Without delay in all cases.
·           Without a delay, in all cases.
·           With a delay if the bleed air was in use.

22.   When selected on, the APU START push button, will:
·           Connect the APU generator to the aircraft electrical system.
·           Start the APU if the APU MASTER SW was previously selected ON.
·           Open the air intake flap and supply fuel pressure.

23.   The APU has an integral independent lubrication system for lubrication and cooling.
·           True.
·           False.

24.   The ECB (Electronic Control Box) controls the fuel flow.
·           True.
·           False.


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 computer automatically starts the APU.
·           Connects the APU generator to the aircraft electrical system.
·           The APU door opens.

26.   The APU MASTER SW FAULT light will illuminate:
·           When APU low oil pressure is detected.
·           When an automatic shutdown of the APU occurs.
·           For an APU overheat or APU fire.
·           If the batteries are selected OFF while the APU is operating.

27.   The APU may be started up to what altitude?
·           The APU can be started at any altitude using normal aircraft electrical power.
·           The APU can be started up to 35,000 feet using only the aircraft batteries.
·           The APU can be started up to 30,000 feet using only the aircraft batteries.
·           The APU can be started up to 25,000 feet using only the aircraft batteries.

28.   The APU system page will appear on the ECAM:
·           When selected by the crew.
·           Automatically whenever the APU is started and AC power is available.
·         Both are correct.

29.   If APU bleed was used, after a manual shut down sequence, the APU:
·           Stops immediately.
·           Keeps running for 4 minutes.
·           Keeps running for 2 minutes.
·           Keeps running for 60 seconds.

30.   With the engines off, if the AVAIL light is illuminated on both the APU START push button and the EXTPWR push button, what is the source of electrical power for the aircraft busses?
·           It is not possible to determine without checking the ECAM.
·           The aircraft batteries.
·           The APU.
·           External power.

31.   BAT 1 and 2 push buttons do not need to be selected ON if external power is available.
·           It is normally left in the lights out position.
·           When selected OFF, the APU generator is de-energized.
·           Both are correct.

32.   When the APU is running, the APU fuel pump:
·           Runs when tank pumps pressure is not sufficient.
·           Runs all time.
·           Runs only in flight.
·           Runs when the APU fuel pump is selected on.

33.   The APU BLEED valve is automatically closed above ______ feet descending by the ECB.
·          23,000 feet.
·           26,000 feet.
·           28,000 feet.
·           29,000 feet.

34.   With nobody in the cockpit, if you have an APU FIRE, which statement is correct?
·         On the ground, 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.
·         On the ground an APU AUTO shut down will occur but you have to discharge the APU fire bottle manually.
·        In the air, an APU EMER shut down will occur and the APU fire bottle will be discharged automatically.

35.   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 compressor.
·           3rd stage turbine.
·           2nd stage turbine.
·           Mechanical shaft.

36.   Fire on ground or in flight will cause the APU MASTER SW push button FAULT light to come on.
·           True.
·           False.

37.   With battery power, what would an APU fire test look like?
·           APU FIRE pushbutton illuminated.
·           SQUIB and DISCH lights illuminated.
·           Both are correct.

38.   The starter engages if the air intake is closed and the MASTER SW and the START pushbuttons are ON.
·           True.
·           False.

39.   A FLAP OPEN indication is displayed in amber when the APU air inlet flaps is fully open
·           True.
·           False.

40.   The APU may obtain power for starting from:
·           Ground services.
·           Normal aircraft supply.
·           The aircraft's batteries or in combination with the external power.
·           All of the above.

41.   The APU cannot be shut down from outside the aircraft.
·           True.
·          False.

42.   What are some of the causes for an APU automatic shutdown?
·        Fire (on ground only), EGT overtemperature, No acceleration, low oil pressure.
·        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), underspeed, overspeed, EGT overtemperature, Reverse flow, Low oil pressure, DC power loss.


43.   Can the APU FIRE test be performed with the APU running?
·           Yes
·           No

44.   The APU is supplied from the:
·           Left fuel feed line.
·           Right fuel feed line.
·           Left or right fuel line.

45.   On ground, the No Break Power Transfer function is inhibited in case of APU shutdown generated bywhich of the following conditions?
·           Automatic APU shut down triggered by the ECB.
·           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.

46.   Can the APU be used with wing anti-ice on?
·           No.
·           Yes, but only for electrical power. The APU bleed valve should not be opened while      using wing anti-ice.
·           Yes, except during approach and go-around.
·           Yes, but the altitude of utilization is limited to 15, 000 ft.

47.   On ground, can you start the APU using the aircraft batteries only?
·           Yes.
·           No.

48.   When starting the APU, the FUEL LO PR indication appears amber when an APU fuel low pressure isdetected.
·           True.
·           False.

49.   The LOW OIL LEVEL advisory pulses in ____ if the APU oil quantity approaches its minimum value.
·           Amber.
·           White.
·           Red.
·           Green.

50.   If an APU start is initiated on battery power only, is fire protection available?
·           Yes.
·           No.

51.   A319/320/321. With the APU supplying bleed air what will be the pack flow if the PACK FLOW selector is LOW?
·           A319/320 – HIGH and A321 – NORMAL.
·           A319/320 – NORMAL and A321 – HIGH.
·           NORMAL in all cases.
·           HIGH in all cases.

52.   How many APU fire extinguisher bottles are installed?
·           One.
·           Two.
·           One AC operated and one DC operated.

53.   Will the APU bleed valve close automatically during climb? Will it reopen during descent?
·           Yes.
·           No.

·           APU FIRE pb illuminated and SQUIB + DISCH lights illuminated.
·           APU FIRE pb illuminated.
·           SQUIB + DISCH lights illuminated.








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