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A321 > Fuel > Flashcards

Fuel Flashcards

1
Q

Where is the fuel stored ?

A

In the wings, centre tanks, and Additional Centre Tank (ACT)

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2
Q

What is vent surge tank ?

A

Locate outboard of each wing tank and is used for fuel expansion due to heat

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3
Q

How the main fuel pump system work ?

A

The engines are supplied from wing tanks only, 2 pump on each wing tank.
Fuel in the centre tank is transfer to wink tank through jet pump.

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4
Q

What is Engine LP valve function ?

A

Cut off fuel flow to the engine

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5
Q

How can crew close the Engine LP valve ?

A

-ENG MASTER switch
-ENG FIRE PUSH pb

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6
Q

What is the function of Suction valves ?

A

Allow engine to be fed from wing tanks by gravity.
(Closed by pump pressure during normal operation)

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7
Q

What is the fuel feed sequence ?

A

ACT-Centre tank-Wing tank

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8
Q

How is the fuel tranfered from centre tank to wink tank ?

A

When transfer valve open, fuel from wing tank flow through the jet pump and creat suction in it, which draw the fuel from centre tank into wing tank.

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9
Q

Which computer control the transfer valve ?

A

The Fuel Level Sensing Control Unit (FLSCU)

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10
Q

What is the centre tank transfer valve control logic ?

A

FLSCU close the valve when wing tank is full; reopen when 250kg of wing tank fuel is used (fuel level reach the underfull sensors)

The Fuel Level Sensing Control Unit

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11
Q

What need to be kept in mind when MODE SEL is in manual ?

A

Monitor wing tank fuel level, close the tranfer valve by push CTR TK XFR pb when wing tank is full, or centre tank is empty.

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12
Q

When will ACT fuel transfer occur ?

A

After takeoff at slats retraction, if centre tank high level sensor is dry > 10min and ACT not empty.

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13
Q

How is fuel is transfer from ACT to centre tank ?

A

Via pressurization of the tank by closing ACT vent valve and open air shutoff valve.

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14
Q

How to tranfer fuel from ACT to centre tank manualy ?

A

Select ACT pb to FWD

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15
Q

How to prevent centre tank overflown while manualy transfer from ACT ?

A

Select ACT pb to AUTO when centre tank is full.

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16
Q

Can fuel be supply to APU when loss of tank pump or loss of normal AC power ?

A

Yes, by a special pump, which run off the AC ESS SHED or AC STAT INV BUS if AC ESS SHED failed.

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17
Q

What is automatic refueling sequence?

A

Fuel goes into ACT,Centre tank, Wing tank simultaneously (if fuel exceed wing tank,if not fill wink tank only)

18
Q

What is manual refueling sequence ?

A

Fill wing tanks first, then centre tank, then ACT

19
Q

What may stop the automatic refueling process ?

A

Electrical transients (cause by switching btw APU, external and engine electrical supply)

20
Q

Where are the refueling point ?

A

Under the right wing

(also left if installed)

21
Q

Can the a/c be refuel with only battery power ?

A

YES

22
Q

How long does it take for refueling ?

A
  • 17 min for wink tanks
  • 20 min for all tank (without ACT)
  • 25 min with 1 ACT
  • 27 min with 2 ACT
23
Q

What is the function of Fuel Quantity Indication ?

A

-FQI transmit fuel mass and temp of fuel in the tank to ECAM
-Control automatic refueling

Fuel Quantity Indication

24
Q

How does FQI operate ?

Fuel Quantity Indication

A

FQI has 2 channel, channel 2 activates when channel 1 fails

Fuel Quantity Indication

25
Q

What do you do if fuel is over read after take off ?

A

This is normal due to acceleration, wait max 6 min before troubleshooting

26
Q

What is the function of FLSCU ?

Fuel level sensing control unit

A

-Control fuel transfer btw wing and centre tank, centre tank and ACT
-Control IDG cooling recirculation

27
Q

When will LO LVL warning appear on ECAM ?

A

When fuel quantity in one wing tank goes below 750kg

28
Q

What is the purpose of Fuel Tank Inerting System ?

A

Reduce the flamability in the centre fuel tank

29
Q

Do wing tanks have Fuel Tank Inerting system ?

A

No

30
Q

How does Fuel Tank Inerting System work ?

A

The system produce an oxygen-depleted air that goes into the centre tank instead of ambient air.

31
Q

FAULT lt on L(R) TK PUMP pb ?

A

Low pump pressure

32
Q

MODE SEL pb-sw

-AUTO
-MAN
-FAULT lt

A

AUTO: Control of centre tank transfer valves
-Open when wing tank not full
-Close 5 min after centre tank low level is reach

MAN: Crew manualy control the valves via CTR TK XFR pb-sw

FAULT lt: MODE SEL at AUTO and centre tank has > 250kg of fuel while wing tank(L or R) has < 5000kg of fuel

33
Q

FAULT lt on CTR TK XFR pb-sw ?

A

Wing tank overflow

34
Q

When is fuel transfer from ACT to centre tank automatically ?

A
  • A/C in flight
  • Slats retract
  • ATC low level sensor is wet
  • Centre tank high level sensor is dry for 10 min
    Transfer stop when one of the condition is not met
35
Q

FAULT lt on ACT pb ?

A

Centre tank has < 3000kg of fuel and 1 ACT has more than 250 kg of fuel
ACT pb in AUTO

36
Q

How does fuel temperature indication on the ECAM FUEL page work ?

A

This appear when temp sensors are wet.
Advisory appear only on phase 2 and 6 when fuel temp
-Abv 45⁰C
-Blw -40⁰C

37
Q

What does an amber line across the last two digits of the fuel quantity mean ?

A

the FQI is inaccurate

Fuel quantity indication

38
Q

What does the REFUEL message on the ECAM indicate ?

A

The refuelling control pannel door is not closed

39
Q

Can fuel be transferred from one tank to another ?

A

Only during ground refueling

40
Q

What does an amber half boxed ECAM FOB indicate ?

A

Some fuel is unusable

41
Q

What is the max fuel a/c can carried ?

A

Without ACT: 18.6
1 ACT: 20.9
2 ACT: 23.2

plus 2.3 with each ACT

approximately

A321 (25 decks)

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