Type Course > ATA 28 Fuel > Flashcards

ATA 28 Fuel Flashcards

(42 cards)

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1
Q

What is inside the vent duct which is connected to a NACA type intake?

A

Vent protector and a flame arrestor

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2
Q

What is the purpose of the vent protector?

A

Prevent clogging of the vent duct by ice formation

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3
Q

Where will most of the fuel flow if the centre tank is overfilled?

A

Right wing tank through the relief valve

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4
Q

Where does the centre tank vent into?

A

The LH vent surge tank

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5
Q

Where do the overpressure protectors vent fuel to?

A

Outer cell and centre tank vent their fuel into the inner cell

Inner cell and surge tank vent fuel overboard

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6
Q

What is the purpose of the vent float valves?

A

Prevent fuel from passing in the vent lines during aircraft manoeuvres

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7
Q

What is fitted to the wing overpressure relief holes of some aircraft to reduce loud take-off and landing tonal noise?

A

Vortex generators

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8
Q

What isolates the centre tank from the air conditioning compartment below it?

A

Vapour seal which is a fabric membrane

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9
Q

What is installed at the highest point between the centre tank pump and the LP fuel valve?

A

Air release valve

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10
Q

When will the pressure switches in the centre tank and the wing tanks send a warning signal to the ECAM system?

A

If the pressure from the tank pump decreases to less than 6 psi

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11
Q

How do the sequence valves, located in the wing inner cell, ensure that the centre tank is emptied first?

A

Acts as a relief valve and keeps the output pressure of the wing tank pump 5 psi lower than that of the centre tank pump

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12
Q

What does each collector cell have?

A
  • Two fuel pumps contained in their related canisters
  • Two fuel strainers
  • A suction valve
  • Two check valves
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13
Q

What does the bypass suction valve in each wing inner cell do?

A

Lets fuel be sucked from the wing tank by the engine fuel pump system when no tank pumps are running

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14
Q

How is fuel removed from the surge tanks into the wings outer cell?

A

Two scavenge jet pumps

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15
Q

When will the intercell transfer valves close after being controlled to open by low fuel levels in the inner cell?

A

On ground during next refuelling operation or electrical power up of the fuel system

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16
Q

What component allows fuel, heated by IDG oil, to return to the outer cell?

A

Fuel Diverter and Return Valve (FDRV)

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17
Q

At what temperature will the FDRV maintain the returned fuel to the outer cell, and how does it achieve this?

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A

100°C

Mixes the hot fuel with cold fuel from the LP fuel pump

18
Q

What pressure does the pressure-holding valve keep the pressure in the return line for the FDRV?

19
Q

Describe the pump logic?

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A

When returned fuel from the FDRV causes the fuel to reach the FULL level sensor, the centre pump stops

Wing tank pumps will supply the fuel to the engine until approximately 500 kg of fuel are used and the UNDERFULL sensor is reached

Centre tank pumps start again

20
Q

At what temperature is the outer cell high temperature sensor maintaining the temperature at, causing closure of the FDRV through signals sent by the FLSCU to the EEC (through the EIUs)?

21
Q

At what temperature is the inner cell high temperature sensor maintaining the temperature at, causing closure of the FDRV through signals sent by the FLSCU to the EEC (through the EIUs)?

22
Q

Why does the FDRV close if low pressure is sensed at all pump pressure switches?

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A

Prevent return fuel flow during engine gravity feeding

23
Q

When might the centre tank pumps not be running, where the aircraft is on the ground, centre tank pumps are in AUTO mode and there is fuel in the centre tank?

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A

Slats extended and no engine running

24
Q

What is the time delay for centre tank pumps running on the ground with slats extended after engine start?

25
When will the centre tank pumps stop automatically after the fuel has been used?
5 minutes
26
Under what conditions will the ECAM - FUEL AUTO FEED FAULT message be displayed?
* One or both wing tanks with less than 5000 kg * Centre tank with more than 250 kg
27
At what pressure on the microswitch in the left cross feed line will the APU fuel pump stop, and at what pressure will it restart?
Stops when pressures reach 23.3 psi Restarts at pressures below 21.7 psi
28
When will the APU LP fuel shut-off valve open?
* APU master switch is set to ON * Fuel ventilation P/BSW in the APU compartment is pressed and held
29
Which tank probes have diodes that give the fuel temperature to the FQIC for indication on the ECAM system display?
Fuel probe number 2 in inner cell Fuel probe number 13 in the outer cell
30
How many capacitance probes are in each tank?
Centre - 5 Wing - 14
31
How can the Capacitance Index Compensator (CIC) calculate the fuel mass?
Mass can be calculated from a density value as assumed from the dielectric constant value Standard dielectric constant value depends on the type of fuel and fuel temperature
32
What do the cadensicons do?
Give a signal to the FQIC in proportion to the density and the dielectric constant of the fuel held in each tank
33
What component sends the left and right MLG compressed signals to the FQIC?
LGCIU 1
34
What is the accuracy of the FQIC in calculating the mass of fuel in normal operation?
1%
35
What is the reduced accuracy of the FQIC?
3%-4%
36
How is a degraded display indicated on the ECAM fuel page?
Two amber dashes through the Fuel On Board (FOB) display
37
What are the three low level sensors at a fuel level of 750 kg in each wing used for?
* Opening of the intercell transfer valves simultaneously in both wing tanks when exposed to air the first time * Generating the wing tank low level warning on ECAM when exposed to air for more than 30 seconds
38
Which fuel pump is single phase?
APU
39
What are the low level sensors in each wing of the A321 and related message for each?
* Two 1500 kg - Green FOB BELOW 3T after 30 seconds of being dry * Two 750 kg - Amber X WING TK LO LVL after 30 seconds of being dry
40
On the A321, when do the centre tank transfer valves automatically open?
When wing tanks are 200 kg below full level
41
What components are used in the A321 which take the role of the condensicons and CICs of the other variants?
Dualcomp and ultracomp
42
At what fuel level is the IDG cooling shut-off?
280 kg
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