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Arkia A321 > Fuel System > Flashcards

Fuel System Flashcards

1
Q

What is the total fuel capacity?

A

23,410 KG

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2
Q

Center tank capacity?

A

6,437 KG

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3
Q

Wing tanks capacity?

A

2 * 6,036 KG

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4
Q

ACT capacity?

A

2 * 2,450 KG

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5
Q

What happens when the fuel tank pumps fail?

A

Suction valves in the tanks allow gravity fuel feeding to the engine

Note: Gravity feeding is not available from the center tank.

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6
Q

When fuel is used to cool the IDGs, where is the heated fuel deposited?

A

The wing tank via the Fuel Return Valve (controlled by the FADEC)

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7
Q

What does it mean if the fuel quantity is boxed in amber?

A

The fuel is unusable

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8
Q

When will the fuel quantity pulse?

A

The difference between fuel quantities in the fuel tanks is greater than 1500 kg, the higher value pulses.

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9
Q

What does it mean when FOB has a half amber box around it?

A

Some fuel is trapped

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10
Q

What does the REFUELG memo mean?

A

The refueling panel door is open, not necessarily that you are currently refueling.

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11
Q

What does the FAULT light on the CTR TK MODE SEL pb mean?

A

Center tank > 250 kg and either wing < 5000 kg

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12
Q

What do the FAULT lights on the pump pb mean?

A

Delivery pressure drops. It does not come on when OFF is selected.

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13
Q

How long does it take to refuel?

A

17 min to fill wings
20 min to fill wings + center
27 min to fill all tanks

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14
Q

When refueling what tanks fill first?

A

During automatic refueling, fuel goes to all tanks simultaneously.
During manual refueling, fill wing tanks first, then center tank, then ACTs.

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15
Q

In the A321, where is fuel always pulled from?

A

Respective wing tanks only, motive flow pulls fuel out of the center tank.

Note: there is only one wing tank per side on the A321

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16
Q

(A321) The wing tank is full, when will the transfer valves allow fuel from the center tank to refill the wing tank?

A

When the wing tank is reduced by 250 kg

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17
Q

(A321) If ACTs are installed in what order are they depleted?

A

ACT2 to center
ACT1 to center
Center to Wing

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18
Q

(A321) How is fuel transferred from the ACTs to the center tank?

A

Positive Cabin Air Press

It will transfer to center tank when 30 min after landing gear up

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19
Q

(A321) What is the warning when manually selecting the CTR TK MODE SEL pb?

A

You are responsible for monitoring the center and wing tank fuel levels

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20
Q

(A321) Only when would you get a FAULT on the CTR TK XFR pb?

A

Only when the center tank overflows, NOT when you have a transfer failure.

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21
Q

With tanks full, and all pumps on, which tanks are feeding the engines initially?

A

From the centre tank or the inner wing tanks to the engines.

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22
Q

When do the transfer valves close?

A

They will automatically stop 5 min after center tank low level is reached

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23
Q

How are the IDG (Integrated Drive Generator) cooled?

A

Some of the fuel supplied to each engine goes from the HP fuel line in that engine, through the IDG heat exchanger, to the fuel return valve and to the wind tanks.

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24
Q

What causes a FAULT light to illuminate in the MODE SEL switch?

A

Amber light, ECAM caution comes on when centre tank has more than 250kg of fuel, and the left or right wing tank has less than 5000kg.

25
Q

What happens when the refuelling TEST switch is pressed.

A

HI LVL: HI LVL lights come on if high level sensors and associated circuits are serviceable.LTS: lights on panel and all 8’s on FQI and preselector come on.

26
Q

What is indicated on the SD, by a fuel pump indication of cross-line (green)?

A

Pump contractor is off, and auto shut-off is required. (pump off + selected off)

27
Q

The amber line through last two digits the fuel quantity indicated what?

A

The FQI is inaccurate.

28
Q

When does the fuel used indication reset to zero?

A

It is automatically reset, when the engine is started on the ground.

29
Q

What causes a fuel tank temperature indication to go amber?

A

If the temperature is >45 degrees for the inner cell, >55 degrees for the outer cell or

30
Q

REFUELG on the EWD means what?

A

REFUELG appears in green, when the door of the refuel control panel on the fuselage or on the wing is open.

31
Q

What does CTR TK FEEDG mean on the EWD?

A

In green, if at least one centre tank pump is energized.

32
Q

What is indicated by OUTER TK FUEL XFRD on the EWD?

A
  • In green if at least one transfer valve is open in own wing tank (1 out of 4).- All 4 should open, if both in the same wing fail to open, then an ECAM warning comes up.
33
Q

What is the minimum fuel quantity for take-off?

A

1500kg, and no wing tank low-level warning

34
Q

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

A

The fuel temperature indication appears when its associated temperature sensor is wet. It is normally green. Advisory only in phases 2 and 6 when fuel temperature is above 45°C for the inner cell or 55°C for the outer cell or below -40°C.

35
Q

What is the purpose of the transfer valve?

A

Two electrical transfer valves are mounted in each wing to permit fuel transfer from outer to inner tank.

36
Q

From which tanks will fuel gravity feed?

A

Outer cell of the wing tanks and inner cell of the wing tanks.

37
Q

What are the main tasks of the fuel system?

A

The fuel system stores fuel in the tanks supplies fuel in the correct quantities to the fuel tanks during refuelling supplies fuel to the engines and the APU circulates fuel to cool the IDG and keeps fuel in the outer wing tank for wing bending and flutter relief.

38
Q

How does the APU fuel feed work?

A

A special fuel pump supplies fuel for APU start up when fuel feed pressure is low (due to loss of tank pumps or loss of normal AC electrical supply). This pump normally runs off the AC ESS SHED but runs off the AC STAT INV BUS if the AC ESS SHED fails.

39
Q

Where is the refuelling point?

A

The ‘standard’ refuelling point is under the right wing a second refuelling point under the left wing is optional.

40
Q

When does the fuel transfer start from the outer to the inner tanks?

A

The transfer valves open automatically when the inner tank reaches the low level (about 750kg/1650lb) thus enables the fuel to drain from the outer to inner tanks. Two level sensors are installed in each inner tank. Each sensor controls two transfer valves one in each wing ensuring simultaneous transfer to both wing tanks. When open the valves are latched open. They will automatically close at the next refueling operation.

41
Q

What is the fuel feed sequence for the A320?

A

Center tank inner tanks (down to 750kg in each inner tank) outer tanks (fuel transfered into the inner tanks).

42
Q

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

A

The Fuel Quantity Indication is inaccurate.

43
Q

What is the purpose of the cross feed valve?

A

The cross feed valve controlled by a double motor allows both engines to be fed from one side or one engine to be fed from both sides.

44
Q

The message CTR TK FEEDG appears in the MEMO. What does it mean?

A

At least one CTR TANK pump delivers fuel to the engines.

45
Q

How is the fuel transferred from the outer to the inner tanks?

A

The transfer valves have been opened automatically by the low level sensor in the inner tank.

46
Q

After engine shutdown what are your actions to close the fuel transfer valves?

A

No action required. The valves will close automatically during the next refueling.

47
Q

L (R) TK PUMPS pb
(FUEL Panel)

  • ON
  • OFF
  • FAULT Light
A

ON:Pump is ON.OFF:Pump is OFF and OFF button lights up white.FAULT light:Low delivery pressure. It does not come on when OFF is selected.

48
Q 
MODE SEL pb
(FUEL Panel) (A321)
- AUTO
- MAN
- FAULT Light
A

AUTO:Control of center tank transfer valves is automatic.- They open if the associated wing tank is not full.- They close automatically 5 min after the center tank reaches low level.MAN: Flight crew controls the center tank transfer valves manually with CTR TK XFR pb.FAULT light:- The center tank has more than 550 lb of fuel and the left or right wing tank has less than 11000 lb and- The MODE SEL pb is at AUTO

49
Q

CTR TK L(R) XFR pb
(FUEL Panel) (A321)

  • ON
  • OFF
  • FAULT Light
A

ON:- The transfer valve opens if MAN mode is selected with the MODE SEL pb.- The transfer valve is controlled automatically when the flight crew selects AUTO mode.OFF:The transfer valve is closed.FAULT light:Associated wing tank overflows.

50
Q

CTR TK PUMP 1(2) pb
(FUEL Panel) (A319/A320)

  • ON
  • OFF
  • FAULT Light
A

ON:- Pump is automatically controlled if the MODE SEL pb is in the AUTO mode.- Pump is running if the MODE SEL pb is in the MAN mode.OFF:Pump is OFF and the OFF button lights up.FAULT light:Pump is in operation and the delivery pressure drops.

51
Q

X FEED pb
(FUEL Panel)

  • OFF
  • ON
  • OPEN Light
A

OFF:The valve closes, and button does not light up.ON:The valve opens, and the ON button comes on white.OPEN Light:Green light comes on, when the valve is fully open.

52
Q

ACT pb
(FUEL Panel)

  • AUTO
  • FWD
  • FAULT Light
A

AUTO:Control of the ACTs transfer is automatic.- The automatic forward transfer occurs, if:• The aircraft is in flight, and• The slats are retracted, and• At least one ACT low level sensor is wet, and• The center tank high level sensor has been dry for at least 10 minutes.- The automatic forward transfer stops, as soon as one of the above conditions is not met.FWD:Manual transfer to the center tank is initiated by opening:- The ACT transfer valve- The ACT 1 or 2 inlet valve.The ACT transfer pump is then commanded on.FAULT light:Amber light and associated ECAM caution come on, when:- The center tank has less than 6614 lb of fuel, and one ACT has more than 550 lb of fuel, and- The ACT pb is on AUTO.

53
Q

What does the REFUEL message on the ECAM indicate?

A

The refuelling control panel door is not closed

54
Q

How many fuel pumps are installed?

A
  • 2 in each wing tanks- 2 in the center tank- 1 APU pump to provide fuel to the APU when the left wing/center tank pumps are off
55
Q

When does the APU fuel pump run?

A

When the wing or center tank pumps are not on

56
Q

What is the normal in-flight fuel management scheme?

A

Use center tank first, then the wing tanks

57
Q

Can fuel be transferred from one tank to another?

A

Only during ground refuelling

58
Q

What does an amber boxed ECAM FOB indicate?

A

Some fuel is unusable

Arkia A321 (23 decks)

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