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A320 Systems > APU > Flashcards

APU Flashcards

2
Q

How many generators has the APU?

A

One.

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3
Q

When does the APU AVAIL appear green?

A

The APU AVAIL appears in green when APU N is above 95%.

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4
Q

What is the basic element of the APU?

A

The basic element of the APU is a single-shaft gas turbine that delivers mechanical shaft power for driving the accessory gearbox (electrical generator starter etc.) and produces bleed air (engine starting and pneumatic supply).

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5
Q

You switched the APU off. Why do you still have the APU AVAIL indications?

A

The APU will run for a cooling period because you have been using the APU bleed.

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6
Q

The APU may be started up to which altitude?

A

The APU can be started at any altitude using normal aircraft electrical power.

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7
Q

What is the purpose of the Electronic Control Box (ECB)?

A

The ECB is a full-authority digital electronic controller that performs the bulk of the APU system logic for all modes of engine operation such as: Sequences the start and monitor it monitors speed and temperature monitors bleed air sequences the shutdown and controls the automatic shutdown.

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8
Q

What occurs in case of an APU fire with no crew in the cockpit?

A

APU fire warnings operate in the cockpit and in the nose gear bay the AVAIL light goes out the FAULT light comes on the APU shuts down and the APU fire extinguisher discharges.

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9
Q

What is the purpose of the APU in flight?

A

In flight the APU backs up the electrical system and the air conditioning and it can be used to start the engines.

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10
Q

How does the APU fuel system work?

A

The left fuel feed line supplies the APU. The required pressure is normally available from the tank pumps. If pressure is not available (batteries only or pumps off) the APU FUEL PUMP starts automatically. The ECB controls the fuel flow.

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11
Q

What is the function of the APU GEN pushbutton located on the overhead electrical panel?

A

When selected to OFF the APU generator field is de-energized.

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12
Q

How does the fuel supply work for the APU?

A

The left fuel feed line supplies the APU normally via the tank pumps. The APU FUEL PUMP starts automatically if pressure is not available (batteries only or pumps off).

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13
Q

What is the highest altitude the APU can supply bleed air for engine start while providing electrical power?

A

20,000 Feet

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14
Q

Does APU air or electric have priority?

A

Electric

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15
Q

What does the green “AVAIL” light on the APU start pushbutton indicate?

A

The APU is available to provide electrical power and/or bleed air

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16
Q

The APU generator can supply 100% electrical load to what altitude?

A

25,000 Feet

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17
Q

What is the highest altitude the APU can supply bleed air to one pack while providing electrical power?

A

25,000 Feet

18
Q

What is the highest altitude the APU can supply bleed air to two packs while providing electrical power?

A

15,000 Feet

19
Q

What happens when the APU MASTER sw pushbutton is selected ON?

A
  • Electrically powers the APU system (Blue ON light in the pushbutton)
  • Electronic Control Box (ECB) performs a power up test
  • APU ECAM page appears (if EXT or ENG GEN AC power is available)
  • APU air intake flap opens
  • APU fuel isolation valve opens
  • APU fuel pump operates (if no tank pumps are on)
20
Q

With the APU green AVAIL light ON and the EXT PWR blue ON light illuminated, which system is powering the aircraft?

A

EXT PWR

21
Q

What happens when you push the APU START pushbutton?

A
  • Blue “ON” light illuminates
  • When APU air intake flap opens the starter is energized
  • Ignition is turned ON 1.5 seconds after starter is energized
  • Starter is de-energized and ignition turned off at 55% N
  • Blue “ON” light in start button extinguishes
  • Green “AVAIL” light illuminates 2 seconds after 95% N or above 99.5% N
  • APU page disappears from the ECAM 10 seconds later
22
Q

With the APU green “AVAIL” light ON and the EXT PWR green “AVAIL” light on, with system is powering the aircraft?

A

APU

23
Q

With the APU running and supplying bleed air, how do you shut it down?

A
  • APU BLEED pushbutton OFF
  • APU MASTER sw OFF
  • APU will cool down and then shut down
24
Q

If a mechanic pressed the APU AUTO EXTING TEST pushbutton, what would occur?

A

The APU will shut down

25
Q

During the cool down cycle can you still use the APU?

A

Yes, press the APU MASTER sw pushbutton

26
Q

What does an amber “FAULT” light in the APU MASTER sw pushbutton indicate?

A

An ECB commanded auto shutdown of the APU has occurred

A320 Systems (27 decks)

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