Airbus A320 – APU - SmartCockpit - Airline training guides, Aviation, Operations, Safety

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).

Second stage compressor.

Third stage turbine.

Mechanical shaft.

Second stage turbine.

Correct! Wrong!

The APU system page will appear on the ECAM:

All statements are correct.

Automatically whenever the APU is started and AC power is available.

When selected by the flight crew.

Correct! Wrong!

The APU cannot be shut down from outside the aircraft.

True.

False.

Correct! Wrong!

Nobody is in the cockpit, and there is 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.

On the ground, you have to perform the ECAM actions to shut down the APU and extinguish the fire from the cockpit.

In the air, an APU EMER shut down will occur and the APU fire bottle will be discharged automatically.

Correct! Wrong!

The ECB (Electronic Control Box) controls the APU fuel flow.

False.

True.

Correct! Wrong!

The APU has an integral independent lubrication system for lubrication and cooling.

False.

True.

Correct! Wrong!

To start the APU the:

BAT 1 and 2 pbs do not need to be selected ON if external power is available.

BAT 1 and 2 pbs must be selected to ON.

All statements are correct.

Correct! Wrong!

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

False.

True.

Correct! Wrong!

When starting the APU, the FUEL LO PR indication appears amber when an APU fuel low pressure is detected.

True.

False.

Correct! Wrong!

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

True.

False.

Correct! Wrong!

When the APU is running, the APU fuel pump:

Runs only in flight.

Runs when the APU fuel pump is selected on.

Runs all time.

Runs when tank pumps pressure is not sufficient.

Correct! Wrong!

With battery power only, what would an APU fire test look like?

APU FIRE pb illuminated and SQUIB + DISCH lights illuminated.

SQUIB + DISCH lights illuminated.

APU FIRE pb illuminated.

Correct! Wrong!

Can the APU FIRE test be performed with the APU running?

Yes.

No.

Correct! Wrong!

Automatic shutdown of APU on ground will not occur while crew is performing this test.

After 3 starter motor duty cycles, you shall wait 30 minutes before attempting 3 more cycles.

True.

False.

Correct! Wrong!

After 3 starter motor duty cycles, you shall wait 60 min before attempting 3 more cycles.

The APU may be started and operated even if the LOW OIL LEVEL ECAM advisory is displayed. Maintenance action is required within next _____ of APU operation.

10 hours.

25 hours

5 hours.

20 hours.

Correct! Wrong!

Can the APU be used with wing anti-ice on?

No.

Yes, but the altitude of utilization is limited to 15,000 ft.

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.

Correct! Wrong!

How many APU fire extinguisher bottles are installed?

One.

One AC operated and one DC operated.

Two.

Correct! Wrong!

The LOW OIL LEVEL advisory pulses in _____ if the APU oil quantity approaches its minimum value.

White.

Red.

Amber.

Green.

Correct! Wrong!

What is the maximum altitude at which the APU may be started using the batteries only?

25, 000 ft.

39, 000 ft.

20, 000 ft.

15, 000 ft.

Correct! Wrong!

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:

Speed and temperature monitoring.

Sequence and monitoring of start.

Monitoring of bleed air and shut down.

All statements are correct.

Correct! Wrong!

Maximum altitude for APU bleed operation is:

20, 000 ft.

22, 000 ft.

15, 000 ft.

18, 000 ft.

Correct! Wrong!

On ground, can you start the APU using the aircraft batteries only?

No.

Yes.

Correct! Wrong!

The APU may obtain power for starting from:

Ground services.

The aircraft’s batteries or in combination with the external power.

All statements are correct.

Normal aircraft supply.

Correct! Wrong!

The APU MASTER SW FAULT light will illuminate:

When an automatic shutdown of the APU occurs.

When APU low oil pressure is detected.

For an APU overheat or APU fire.

If the batteries are selected OFF while the APU is operating.

Correct! Wrong!

If an APU start is initiated on battery power only, is fire protection available?

Yes.

No.

Correct! Wrong!

When the APU Master Switch is released, 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.

Correct! Wrong!

The APU is supplied from the:

Left or right fuel line.

Right fuel feed line.

Left fuel feed line.

Correct! Wrong!

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.

External power.

The aircraft batteries.

The APU.

Correct! Wrong!

With battery power, what would an APU fire test look like?

APU FIRE pushbutton illuminated.

All statements are correct.

SQUIB and DISCH lights illuminated.

Correct! Wrong!

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.

Connects the APU generator to the aircraft electrical system.

The APU computer automatically starts the APU.

The APU door opens.

Correct! Wrong!

When selected on, the APU START push button, will:

Start the APU if the APU MASTER SW was previously selected ON.

Connect the APU generator to the aircraft electrical system.

Open the air intake flap and supply fuel pressure.

Correct! Wrong!

If APU bleed was used, after a manual shut down sequence, the APU:

Keeps running for 2 minutes.

Stops immediately.

Keeps running for 4 minutes.

Keeps running for 60 seconds.

Correct! Wrong!

What is the maximum operating altitude of the APU?

30,000 feet.

25,000 feet.

39,000 feet.

35,000 feet.

Correct! Wrong!

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.

All statements are correct.

Correct! Wrong!

Fire on ground or in flight will cause the APU MASTER SW pushbutton FAULT light to come on.

True.

False.

Correct! Wrong!

Airbus A320 – APU