Airbus A350 – APU - SmartCockpit - Airline training guides, Aviation, Operations, Safety

Following an automatic start, the APU bleed valve opens and the APU supplies bleed air to the bleed air system when:

The APU is AVAIL. The flight crew sets one of the engine master lever to the START position.

The flight crew sets one of the engine master lever to the START position.

The APU is AVAIL. The flight crew sets one of the engine master lever to the START position. The aircraft altitude is below 25 000 ft.

Correct! Wrong!

The APU automatically starts if:

The aircraft is in flight and when an all engines failure is detected.

On ground if the APU start is automatically aborted. In flight when an all engines failure is detected.

On ground if the APU fails to start. In flight when an all engines failure is detected.

Correct! Wrong!

This indicates the quantity of fuel, used by the APU, since the last reset. This value resets at:

When AC power is available and 5 minutes after the engine-shutdown.

The second engine-start, and at the last engine-shutdown.

The first engine-start, and at the last engine-shutdown.

Correct! Wrong!

When the APU ECON MODE is in operation the APU bleed air is limited to provide minimum cabin air ventilation. There is no control of the temperature in the cabin and in the cockpit.

False.

True.

Correct! Wrong!

What does it indicate?

The APU EGT is at, or more than, the APU EGT red limit. This is associated with the APU SHUTDOWN and APU FAULT ECAM alerts.

The APU EGT is at, or more than, the APU EGT red limit. If the aircraft is on ground, an automatic shutdown sequence begins.

The APU EGT is at, or more than, the APU EGT red limit. The APU has been automatically shutdown.

Correct! Wrong!

The APU oil tank has an oil level sensor that detects a low level of oil. If the oil quantity reaches the low level when the aircraft is on ground, and the APU is off, the APU SD page immediately displays the OIL LEVEL LO advisory. In normal conditions, the APU can continue to operate for _____.

At least 10 h.

At least 2 h.

At least 20 h.

Correct! Wrong!

Maintenance Nose Gear Panel - If a fire is detected in the APU compartment, there is _____

An external horn coming on.

A light and an external horn coming on.

An intermittent horn coming on after 10 seconds.

Correct! Wrong!

The light and the horn remain on, until the fire is extinguished.

The APU can provide a backup for electrical power:

Up to 22,500 ft.

Within the aircraft environmental envelope.

Up to 25,000 ft.

Correct! Wrong!

The APU Starter Generator System (SGS) is a dual function system that can start the APU and supply electrical power (230 V AC).

False.

True.

Correct! Wrong!

APU FLAP INDICATION - What does this indication mean?

The air-intake flap is closed. This indication is only displayed when the APU is ON.

The air-intake flap is closed. This indication will stay on until the APU is shutdown.

The air-intake flap is closed. This indication is only displayed during 10 s, when the flap is closed, then the flap indication disappears.

Correct! Wrong!

In flight, the Auxiliary Power Unit (APU) can provide bleed air to assist engine start, up to an altitude of _____.

22 500 ft

20 000 ft.

25 000 ft.

Correct! Wrong!

During ground operations, the APU fuel consumption is about:

170 kg/h (375 lb/h) with packs ON and APU GEN ON

170 kg/h (375 lb/h) with packs ON or APU GEN ON

230 kg/h (505 lb/h) with packs ON and APU GEN ON

Correct! Wrong!

In flight dual pack operation is possible up to an altitude of _____.

25 000 ft

22 500 ft.

17 500 ft.

Correct! Wrong!

The APU can be shutdown from the external refuel panel.

True.

False.

Correct! Wrong!

The APU can be shut down with an emergency shutdown.

In order to wait for the RAT extension, the automatic APU start is initiated 20 seconds after the detection of the all engines failure.

False.

True.

Correct! Wrong!

The automatic APU start is initiated 10 seconds after the detection of the all engines failure.

At FL100, with APU BLEED ON and APU GEN ON, the APU fuel consumption is about:

170 kg/h (375 lb/h)

230 kg/h (500 lb/h)

200 kg/h (440 lb/h)

Correct! Wrong!

AVAIL INDICATION - What does it mean?

The APU is running, and can supply bleed air and electrical power.

The APU is running, and can supply bleed air and electrical power. This indication appears, when N is above approximately 95 %.

The APU is running, and can supply bleed air and electrical power. This indication appears, when N is above approximately 95 % on ground and 89% in flight..

Correct! Wrong!

If a fire is detected in the APU compartment:

The APU automatically shuts down after 10 seconds, the APU fuel valves close, and the APU fire extinguisher automatically discharges after this warning appears.

The APU automatically shuts down, the APU fuel valves close, and the APU fire extinguisher automatically discharges the agent 10 seconds after this warning appears.

The APU automatically shuts down, the APU fuel valves close, and the APU fire extinguisher automatically discharges after this warning appears.

Correct! Wrong!

APU SHUTDOWN - The APU is available, and flight crew presses the MASTER SW pb-sw is pressed. In order to reduce the temperature of the APU engine there is a:

85 s cooling period enables the APU to run with a minimum load.

30 s cooling period enables the APU to run with a minimum load.

15 s cooling period enables the APU to run with a minimum load.

Correct! Wrong!

After more than three consecutive APU start attempts, the flight crew should wait _____ before a new start attempt.

20 minutes.

60 minutes.

30 minutes.

Correct! Wrong!

Generator Load - What does this indication mean?

There is an overload on the APU generator. The load is above 120 % for more than 5 min or above 160 % for more than 5 s.

There is an overload on the APU generator. The APU has been automatically shutdown.

There is an overload on the APU generator. The APU must be shutdown without delay.

Correct! Wrong!

If the oil quantity continues to decrease to the critical oil level, the APU automatically shuts down after 5 minutes and the ECAM triggers the APU AUTO SHUTDOWN alert

False.

True.

Correct! Wrong!

If the oil quantity continues to decrease to the critical oil level, the APU automatically shuts down and the ECAM triggers the APU AUTO SHUTDOWN alert.

Airbus A350 – APU