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A320 Knowledge > APU > Flashcards

APU Flashcards

1
Q

The APU is a self contained, single shaft, gas turbine engine with its own internal oil and fuel systems that provides the aircraft with….?

A

Pneumatic and electrical power

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2
Q

On the ground the APU supplies….?

A

Bleed Air for starting engines and air-conditioning, and

Electrical power

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3
Q

In flight the APU provides….?

A
  • Back up to electrical system
  • Back up to air conditioning
  • Can be used to start engines
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4
Q

From where can the APU obtain power for starting?

A
  • Aircraft batteries
  • normal electrical system
  • Ground service
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5
Q

Max altitude to assist engine start?

A

20 000ft

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6
Q

Max Altitude for air conditioning and pressurisation (single pack operation)?

a) YUD
B) all others

A

a) 22 500 ft (YUD)

b) 20 000 ft

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7
Q

Max Altitude for air conditioning (dual pack operation)

A

15 000ft

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8
Q

Is the use of APU bleed air for wing anti-ice permitted?

A

NO!

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9
Q

APU Battery Restart limit (Elec Emer Config)?

A

25 000ft

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10
Q

What is the APU operation and Normal restart envelope?

A

Can be operated and restarted throughout the aircrafts normal flight envelope.

Except starting APU on batteries (Elec Emer) limited to 25 000ft

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11
Q

Are the any limits on when the APU can supply electrical power?

A

No,

only limited to the aircrafts flight envelope

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12
Q

After 3 consecutive APU starts, Flight crew must wait ____mins before a new start attempt?

A

60mins

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13
Q

Max N speed

A

107%

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14
Q

Max EGT for starting?

a) YUD
b) others

A

a) YUD:
<35000ft -1090 deg C
>35000ft -1120 deg C

b) Others:
<25000ft -900 deg C
>25000ft -982 deg C

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15
Q

Max APU for running?

a) YUD
b) others

A

a) YUD:
675 deg C

b)
with 5 sec confirmation for shutdown: 682 deg C

for immediate shutdown:
700 - 742 deg C depending on ambient temperature

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16
Q

Is APU allowed to be start / shutdown during refuelling/defuelling?

A

Yes

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17
Q

If APU failed to start or following an automatic shutdown, during refuel / defuel. Is APU now allowed to be started?

A

No.

Do not start APU

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18
Q

What should be done with the APU if a fuel spill occurs?

A

Perform normal APU shutdown

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19
Q

The electronic control box (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:

A
  • Sequences Start and Shutdown
  • Monitors Start, Temp, Speed and Bleed air
  • Controls automatic shutdown
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20
Q

What controls the Electric starter?

A

The ECB.

Electronic Control Box

21
Q

When will the starter engage?

A

When the:

  • air intake is fully open, and
  • MASTER SW and START pb are ON
22
Q

Which fuel feed line supplies the APU?

A

Left side

23
Q

Which fuel pumps normally provide required pressure for APU?

A

Tank pumps

24
Q

When would the tank pumps not be available to provide pressure for APU?

A

Batteries only, or

Pumps OFF

25
Q

How is fuel pressure supplied for APU if pressure from tank pumps is not available?

A

APU FUEL PUMP starts automatically

26
Q

What controls the APU fuel flow?

A

ECB.

Electronic Control Box

27
Q

What do the Inlet Guide Vanes )IGV’s control and what positions them?

A

IGV’s control bleed air flow

A fuel-pressure-powered actuator positions the IGV’s

28
Q

Is the air bleed system fully automatic?

A

Yes

29
Q

What is the APU speed for air contioning demand?

a) YUD?
b) others

A

a) temp -18 to 35 deg C -99%
other temps -100%

b) 100%

30
Q

How is a routine APU shutdown performed?/

A

APU MSTR……OFF

on APU panel

31
Q

How is an emergency shutdown performed?

A

Pilots: APU FIRE Handle, or

Ground crew: APU SHUT OFF on interphone panel

32
Q

May the APU run without cockpit crew supervision on the ground?

A

Yes (FCOM)

33
Q

What are the indications if APU Fire?

A
  • APU fire warnings in cockpit
  • Horn in nose gear bay
  • AVAIL light goes out
  • FAULT light in MSTR sw
  • APU shuts down
  • APU fire extinguisher discharges
34
Q

The APU MSTR sw controls:

A
  • Electric supply for operation

- Starting and shutdown sequences

35
Q

When the APU MSTR is switched off and the APU was using APU bleed supply, for how long does the APU keep running?

A

For a cooling period of 60-120 sec

36
Q

At what % does the air inlet flap close after APU shutdown?

A

7%

37
Q

Does the APU ECAM page always display during APU start?

A

No, not in battery power.

Only if aircraft has ground power or main generator power

38
Q

Other aircraft (Not YUD)

In the case of an automatic, non-emergency (emerg = fire) when does the air inlet flap close?

A

15mins after the APU speed is lower than 7%

39
Q

Other Aircraft (Not YUD)

If an automatic non-emergency (not fire) shutdown happens on the ground when will the 15min countdown for the inlet flap to close, start?

A

after lift-off

40
Q

What does the green AVAIL light mean?

A

The APU is started and can supply bleed air and electrical power to the aircraft systems

41
Q

When does the AVAIL light come on?

a) YUD
b) other aircraft

A

a) when N is above 95%

b) when N is above 99.5%, or
2 sec after N reaches 95%

42
Q

What components are attached to the accessory gearbox?

A
  • Generator
  • Starter
  • Oil pump
43
Q

APU bleed air valve position on ECAM APU page

a) crossline-Amber?
b) XX-amber?

A

a) APU bleed valve is closed and the APU bleed is ON

b) APU bleed valve / APU BLEED pb status info is not available

44
Q

ECAM APU page:

Bleed air pressure shows amber XX

What does this mean?

A

ADIRS 1 or 2 is not available or selected OFF, or

the data from the ECB are invalid or not transmitted

45
Q

ECAM APU page:

At what N speed does the indication become,

a) amber?
b) red?

A

a) amber - above 102%

b) red - above or equal to 107%

46
Q

ECAM APU page:

When does EGT become

a) amber?
b) red?

A

a) amber: EGT >= EGT MAX-33
(inhibited during engine start)

b) red: EGT >= EGT MAX
(automatic shutdown begins)

47
Q

What calculates EGT MAX?

A

The ECB and transmits it to ECAM

48
Q

What is EGT MAX is a function of:

a) during start?
b) when APU is running?

A

a) Function of N during start

b) Function of ambient temperature when APU is running

49
Q

When will the LOW OIL LEVEL advisory pulse green?

A

When aircraft is on the ground, and

APU not running

A320 Knowledge (40 decks)

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