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A320 > Fuel > Flashcards

Fuel Flashcards

1
Q

what does the fuel system do

A
  • stores fuel in tanks
  • distributes fuel during refuelling ops
  • supplies fuel to the engines and APU
  • circulates fuel to cool the Integrated Drive Generators (IDG)
  • keeps fuel in outer tanks for wing bending and flutter relief
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2
Q

what is the center tank capacity

A

6476kg

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3
Q

what are the inner tank capacities

A

5435kg

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4
Q

what are the outer tank capacities

A

691kg

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5
Q

what is the total fuel capacity

A

18729kg

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6
Q

after the tanks have been filled to capacity, how much can the fuel expand without any spillage

A

2% (20C temperature increase)

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7
Q

in which tanks are there overpressure protectors

A
  • vent (surge)
  • outer
  • inner
  • center to the left inner
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8
Q

where are the main fuel pumps

A
  • 2 in each INNER tank (4 total)
  • 2 in the CTR tank
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9
Q

what is unique about the INNER tank pumps

A
  • Pressure relief sequence valves (when all pumps are on - CTR tank pumps will deliver fuel preferentially)
  • suction pumps (allow gravity feeding)
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10
Q

what do the inner tank transfer valves allow

A

fuel to flow from the outer tank to the inner tank

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11
Q

what does the crossfeed valve allow

A
  • both engines supplied by 1 side; or
  • 1 engine supplied by both sides
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12
Q

what closes the ENG LP valve

A
  • ENG MASTER Sw - off
  • ENG FIRE Pb - pressed
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13
Q

which pumps do no have suction valves

A
  • CTR TANK pumps
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14
Q

what do suction valves allow

A

gravity feed of fuel if pump fails

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15
Q

what sequence do the tanks empty

A

1) center tank
2) inner tank (to 750kg)
3) outer tank (transfers into inner tanks)

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16
Q

what is the center tank pump’s control logic

A
  • when inner tanks full = turns off until approximately 500kg of associated inner tank fuel is used (underfull sensor); then
  • inner tank pump turns on
17
Q

when does the fuel transfer from the outer tank to the inner tank
(sensing description)

A
  • approximately 750kg in the inner tank (based on unaccelerated flight)
  • 2 sensors/ inner tank - each controls 1 xfer valve on each side ensuring simultaneous transfer
18
Q

when the fuel recirculation passes through the IDG and back into the fuel tanks, which fuel tank does it return to

A
  • outer tanks
  • if the outer tank is already full then the fuel passes to the inner tank via a spill pipe
19
Q

when refuelling which tanks does the fuel supply directly into

A
  • outer tank (inner tank via spill pipe)
  • center tank
20
Q

what is the approximate refuel time at nominal pressure

A
  • wing tanks - 17 mins
  • all tanks - 20 mins
21
Q

when do the refuel valves close automatically

A
  • tanks at presel value; OR
  • sensors detect high fuel level
22
Q

what does FQI stand for

A

Fuel Quantity Indication

23
Q

what does the FQI system do

A
  • calculates fuel mass, QTY, temp and send info to ECAM
  • controls automatic refuelling
24
Q

how many channels make up the FQI system

A

2 channels (2nd channel takes over automatically if the 1st channel fails)

25
Q

what is the FQI system comprised of

A
  • FQI computer
  • capacitance probes in all tanks for measuring fuel level + temp
  • 1 densitometer (cadensicon) in each inner tank to calculate QTY
  • 1 Capacitance Index Computer (CIC) in each inner tank incase cadensicon fails to measure dielectric constant of fuel
  • QTY indication for each tank
  • refuel/defuel panel to show actual and preselected values
26
Q

what does FLSCU stand for

A

Fuel Level Sensing and Control Unit

27
Q

what is the FLSCU comprised of

A
  • fuel level sensors in tanks to sense high, low, overflow levels
  • fuel temperature sensors to control IDG cooling recirculation
28
Q

with the ‘MODE SEL’ Pb in AUTO when do the CTR TANK pumps run

A
  • engine start + 2mins
  • slats retracted
  • 5 min after CTR TK low level is reached
29
Q

what does a ‘FAULT’ light on ‘MODE SEL’ pb mean

A
  • CTR Tank QTY > 250kg; AND
  • L/R inner tank QTY < 5000kg
30
Q

what does a ‘FAULT’ light on any of the FUEL PUMPS mean

A

delivery pressure < threshold pressure

31
Q

what does it mean when the 2 least significant figure of a fuel QTY indication are double amber dashed

A
  • FQI is inaccurate (degraded mode)
32
Q

what is the inaccuracy for each tank when in degraded mode

A
  • outer = -20kg/+200kg
  • inner = +/-110kg
  • center tank = +/-130kg
  • all tanks = -390kg/+750kg
33
Q

what does a boxed outer tank fuel quantity indicate

A
  • both xfer valves failed to open and inner lo lvl (<750kg)
34
Q

what does a boxed center tank fuel quantity indicate

A
  • both center tank pumps failed OR off
35
Q

when does a boxed FOB indication mean

A
  • both xfer valves not open with outer tanks lo lvl; OR
  • both center tank pumps OFF/ fail
36
Q

when does fuel advisory occur regarding temperature

A

high temp:
- inner > +45
- outer > +50
low temp:
- < -40

37
Q

when does fuel warning occur regarding temperature

A

reaching limits:
-43 to +54

38
Q

when does fuel advisory occur regarding imbalance

A

flight phases 2 and 6 if imbalance between left and right side > 1500kg

A320 (5 decks)

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