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A320 Knowledge > Fuel System > Flashcards

Fuel System Flashcards

1
Q

What is the purpose of the fuel in the outer tanks?

A

To relieve wing bending and flutter

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2
Q

By how much can the expand when the aircraft has been refuelled to maximum capacity, without spilling?

A

By 2%

20°C temperature rise

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3
Q

Where are the overpressure protectors located?

A

In:
Each vent,
Each outer and inner tank, and
Between the center tank and left inner tank

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4
Q

What is the capacity of the inner tanks?

A

5435 kg x 2 = 10 870 kg

useable fuel

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5
Q

What is the capacity of the outer tanks?

A

691 kg x 2 = 1382 kg

useable fuel

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6
Q

What is the total capacity of the wing tanks?

A

12 252 kg

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7
Q

What is the capacity of the centre tank?

A

6476 kg of useable fuel

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8
Q

What is the total fuel capacity with all tanks full?

A

18 728 kg

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9
Q

In normal operation, each engine is supplied by which fuel pumps?

A

One pump in the Centre tank, or

2 pumps in its own side Inner wing tank

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10
Q

What is the purpose of the two electric transfer valves?

A

To permit fuel transfer from Outer to Inner tank

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11
Q

How can the engine fuel flow be stopped?

A

By closing the LP fuel valve via:

  • Engine Master switch, or
  • ENG FIRE PUSH pb
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12
Q

What is the purpose of the suction valves?

A

They allow engines to be fed by gravity if the Inner tank pumps fail

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13
Q

What is the position of the suction pumps in normal operation?

A

Closed

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14
Q

Which fuel pumps are fitted with suction valves?

A

Inner fuel tank pumps only.

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15
Q

Is gravity feeding possible from the Centre tank?

A

No, the centre tank fuel pumps are not fitted with suction valves

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16
Q

In what sequence do the fuel tanks empty?

A
  1. Centre Tank
  2. Each Inner Tank empties down to 750kg
  3. Outer tank fuel transfers to Inner tank
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17
Q

When do the Centre tank fuel pumps stop?

A

Until ~500kg of fuel in the associated Inner tank has been used
(when the fuel level reaches the underfull sensors)

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18
Q

Will the Centre tank pumps run with the MODE SEL in the MAN position?

A

Yes

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19
Q

When do the transfer valves automatically open and latch in the open position?

A

When the inner tank fuel reaches the low level (about 750kg)

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20
Q

When will the transfer valves automatically close?

A

At the next refuelling

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21
Q

How many fuel level sensors are installed in each Inner tank?

A

2

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22
Q

What does each level sensor in the Inner tank control?

A

2 transfer valves - 1 in each wing

ensuring simultaneous transfer to both wings

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23
Q

What is the 750kg (low level) (where transfer valves automatically open allowing the fuel to drain from the outer tank to the inner tank) value based on?

A

Level aircraft attitude, with no acceleration.

During steep descent or accelerations/decel, the transfer valves may open with >750kg of fuel in each inner tank and the low level warning may be triggered

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24
Q

When does the APU fuel pump operate?

A

For APU startup
when fuel feed pressure is low
(due loss of tank pumps or loss of normal AC electrical supply)

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25
Q

What bus does the APU fuel pump normally run off?

A

AC ESS SHED

runs off the AC STAT INV BUS if the AC ESS SHED fails

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26
Q

Which fuel line does the fuel come from that goes through the IDG heat exchanger?

A

The HP fuel line

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27
Q

Where does the fuel return to after it travels through the IDG heat exchanger?

A

the Outer tank

28
Q

IDG cooling is ensured when….?

A

Oil temp is high, or

when engine is at low power

29
Q

How is the IDG heat exchanger fuel return valve?

A

FADEC

30
Q

Where does the IDG cooling fuel go if the Outer tank is already full?

A

Overflows into the Inner tank via a spill pipe

31
Q

In what order does automatic refuelling fill the aircrafts fuel tanks?

A
  1. Outer tank and Centre tank (if required) simultaneously

2. When Outer tank full, fuel overflows to Inner tank

32
Q

In what order does manual refuelling fill the aircrafts fuel tanks?

A
  1. Wing tanks

2. Centre tank

33
Q

What may stop the automatic refuelling process?

A

Electrical transients caused by switching among APU, external and engine electrical supply

34
Q

If automatic refuelling is stopped due to electrical transient what must be done to resume refuelling?

A

re-enter the Pre-selected Fuel Quantity

35
Q

When will the centre fuel tank recieve fuel during refuelling?

A

If the selected fuel load exceeds wing tank capacity of 12 252 kg

36
Q

Can the aircraft be refuelled when only battery power is available?

A

Yes

37
Q

How long will it take to refuel wing tanks?

A

17 mins

38
Q

How long will it take to refuel all tanks?

A

20 mins

39
Q

What does the FQI (fuel quantity indicator) computerised system do?

A
  • Transmits actual total fuel mass, quantity and temperature to ECAM
  • Controls automatic refuelling
40
Q

How many channels does the FQI have?

A

2

41
Q

What happens if FQI channel 1 fails?

A

Channel 2 activates automatically

42
Q

The components of the FQI system

A
  • an FQI computer
  • a set of capacitance probes in each tank (measure fuel level and temperature)
  • a densiometer sensor in each Inner tank (calculate fuel quantity
  • a capacitance Index Compensator (CIC) in each Inner tank giving dielectric constant of fuel (in case of densiometer failure)
  • a quantity indicator for each tank installed on the refuel/defuel panel
  • a pre-selector on the refuel/defuel panel that shows pre-selected and actual total fuel quantity
43
Q

The Fuel Level Sensing Control Unit comprises…..

A
  • fuel level sensors in tanks to sense High, Low and Overflow levels
  • a fuel temperature sensor to control the IDG cooling recirculation
44
Q

What does the Fuel Level System do?

A

Generates fuel-level and fuel-temp signals to:

Operate switching functions for refuel/defuel, and

Control IDG cooling recirculation system, and

Centre tank to Wing tank fuel transfer System

45
Q

When does the low-level sensor trigger the LO LVL warning on the ECAM?

A

When fuel quantity in one wing tank goes below 750kg

46
Q

Is the LO LVL warning totally independent from the displayed fuel quantity indication?

A

Yes! Its sensed by the FLSCU

Quantity indication is calculated by the FQI

47
Q

L (R) Tank Pumps ON -blank

A

Pump is ON, but only feeds fuel when the delivery pressure of the centre tank pumps drop below the threshold

48
Q

When will L (R) / Centre Tank pump FAULT light illuminate?

plus ECAM caution

A

When delivery pressure drops

49
Q

With MODE SEL in AUTO, when are the centre tank pumps controlled?

A
  • run at engine start for 2mins
  • Before or after engine start, centre tank pumps run if slats are retracted
  • Centre tank pumps stop 5 mins after centre tank low level is reached
50
Q

When will the MODE SEL pb FAULT light illuminate (with ECAM caution)?

A

When centre tank has more than 250 kg fuel, and

L/R wing tank has less than 5000kg fuel

51
Q

When will the fuel temperature indication appear?

A

when its associated temperature sensor is wet

52
Q

When will a fuel temperature advisory appear?

A

Inner >45°C

Outer >55°C

Below -40°C

53
Q

What do two dashes mean when over the last two fuel quantity digits?

A

The FQI is inaccurate

54
Q

What is meant if the Outer fuel quantity indication is boxed amber?

A

Both transfer valves have failed to open - Inner tank at low level (750kg)

55
Q

When will centre tank fuel quantity be boxed amber?

A

If both centre tank pumps fail or are switched OFF

56
Q

How is a wing overflow indicated?

A

associated Inner tank quantity turns amber

57
Q

When will a fuel quantity advisory appear?

A

When difference between fuel quantities in wings is greater than 1500kg

58
Q

How is a fuel quantity advisory indicated?

A

wing inner and outer tank indications pulse with highest fuel level

59
Q

What would cause FOB to be half-boxed (boxed-YUD) amber?

A
  • Centre tank pumps fail or switched OFF

- Both transfer valves failto open, when inner tank is low level (750kg)

60
Q

When is the engine identification number amber instead of white?

A

When the engine is below idle

61
Q

When is fuel used indication green?

A

From flight phase 2 until electrical power is cut off at the end of the flight

62
Q

When does the fuel used indication automatically reset?

A

When the engine is started on the ground

63
Q

When will an amber half box appear around the Total Fuel Indication?

A

When displayed quantity is not all useable.

intercell transfer valve fail or centre tank pump fail

64
Q

If two dashes over fuel quantity, then FQI is in degraded mode. Where will you find the fuel adjustment figures for this problem?

A

FCOM DSC-28-20 pg15/16

65
Q

What does the green REFUELG memo mean?

A

The door of the refuel panel is open

A320 Knowledge (40 decks)

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