Auxiliary Power Unit A320: DGCA Airbus A320 questions

Question 1

On ground, the No Break Power Transfer function is inhibited in case of APU shutdown generated by which of the following conditions?

Accepted Answer

All of the above.

Answer

Automatic APU shut down triggered by the ECB.

Answer

APU shut down from the REFUEL/DEFUEL panel or from the APU FIRE pushbutton.

Answer

APU shut down from emergency control provided on the external power panel.

Question 2

You have to wait for 5 seconds after selecting Master Switch to ON and before selecting Start pb to ON for APU Start.

Accepted Answer

True always whether you start APU with EXT PWR ON or OFF.

Answer

True only if EXT PWR OFF

Answer

True only if EXT PWR ON.

Answer

N/A

Question 3

For the APU MASTER SW FAULT light:

Accepted Answer

This amber light comes on, and a caution appears on ECAM, when an automatic APU shutdown occurs.

Answer

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

Answer

N/A

Answer

N/A

Question 4

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

Accepted Answer

25,000 ft

Answer

15,000 ft

Answer

20,000 ft

Answer

39,000 ft

Question 5

In flight, APU AUTO SHUT DOWN failure message appears. What will be your action?

Accepted Answer

Just do the follow up action of Master Switch OFF as per ECAM.

Answer

No action, since APU is automatically stopped.

Answer

There is no checklist for this failure.

Answer

N/A

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