FUEL / HYD
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Questions and Answers

How many pumps are there in the wing or center tanks:

  • One fuel pump in each tank
  • Two fuel pumps in each tank (correct)
  • There is no fuel pump because the tanks are air pressurised
  • Two fuel pumps only for all tanks

    • Normally, where can you check the fuel quantity of each tank:

  • On ECAM upper display, on fuel page
  • On fuel page only, on ECAM lower display (correct)
  • On ECAM upper display
  • On ECAM upper display, or on refueling control panel

    • With all fuel pump switches on, are wing tank pumps running while center tank is supplying?

  • Yes, wing tank pumps are always running (correct)
  • No, only when center tank is empty
  • No, because of center tank pump priority
  • No, because of automatic switching with fuel in center tank

    • Excluding the surge/vent tank, how many cells are in each wing tank on an A320 CEO?

    <p>Two</p> Signup and view all the answers

    Where is the vent surge tank located?

    <p>In the outer section of each wing</p> Signup and view all the answers

    The fuel remaining in the surge tank scavenged into the adjacent cell, which is (A320):

    <p>The outer cell</p> Signup and view all the answers

    Which type of motor controls the fuel x-feed:

    <p>Double</p> Signup and view all the answers

    Where are the transfer valves located:

    <p>On the sealed rib of each wing tank (i.e. between each inner and outer cell)</p> Signup and view all the answers

    What is the purpose of the pressure relief sequence valves:

    <p>When all pumps are running, center pumps will deliver fuel preferentially</p> Signup and view all the answers

    In normal operation, each engine is supplied by:

    <p>Two wing tank pumps and one center tank pump</p> Signup and view all the answers

    Is gravity feeding from center tank possible:

    <p>No</p> Signup and view all the answers

    The LP valves are controlled to the off position by:

    <p>Engine master switches and fire push buttons</p> Signup and view all the answers

    The normal tank filling order is:

    <p>Wing tanks then center tank</p> Signup and view all the answers

    The normal tank filling order is:

    <p>Wing tanks then center tank</p> Signup and view all the answers

    Amber fault light illuminates on tank pump P/B when:

    <p>The delivery fuel pressure drops</p> Signup and view all the answers

    Amber fault light illuminates on ‘mode sel.’ P/B when:

    <p>Center tank has more than 250 kg and any wing tank has less than 5,000 kg</p> Signup and view all the answers

    On the A320 CEO, the maximum fuel imbalance (inner tanks with heavier tank full) is:

    <p>1,500 kg</p> Signup and view all the answers

    The fuel used indication is automatically reset:

    <p>When the engine is restarted on the ground</p> Signup and view all the answers

    FOB (fuel on board) boxed amber on ECAM fuel page means

    <p>Both transfer valves in either wing tank fail to open when inner cell is at low level, or the center tank pumps are off</p> Signup and view all the answers

    Fuel on board half boxed amber on upper ECAM means:

    <p>The quantity shown is not fully usable (intercell valve failure or loss of ctr. tank pumps)</p> Signup and view all the answers

    If open when will the transfer valves close again:

    <p>Transfer valves close automatically at the refueling selection</p> Signup and view all the answers

    For what purpose is fuel used by the electrical system:

    <p>To cool the IDG oil</p> Signup and view all the answers

    APU fuel is supplied by:

    <p>Either main (AC) pumps or APU pump</p> Signup and view all the answers

    With slats extended, the center tank pumps run on ground:

    <p>Yes, after engine start for 2 mins</p> Signup and view all the answers

    What does the mode selector push-button control:

    <p>Center tank pumps only</p> Signup and view all the answers

    When the center tank is empty (mode auto), center tank pumps:

    <p>Stop automatically, 5 mins after low level is reached in the center tank</p> Signup and view all the answers

    What happens to the IDG cooling fuel when the outer cells are full?

    <p>Fuel overflows into the inner cell through a spill pipe</p> Signup and view all the answers

    What happens to the IDG cooling fuel when the wing tank is full?

    <p>The system selects center tank pumps off, wing tank pumps feed approx. 500 kg, and the center tank pumps run again</p> Signup and view all the answers

    Suction valves are:

    <p>Normally closed by pump pressure</p> Signup and view all the answers

    Why has a 2% additional space been provided in each fuel tank:

    <p>For fuel expansion without spillage into the vent surge tank</p> Signup and view all the answers

    During take-off the center tank fuel is:

    <p>Not supplied while slats are extended</p> Signup and view all the answers

    With fuel in all tanks (A320), in flight, fuel is used:

    <p>From the center tank, then from inner cells to a predetermined level when outer cell fuel combines with inner cell fuel</p> Signup and view all the answers

    In normal operation the crossfeed valve is:

    <p>Closed for take off</p> Signup and view all the answers

    Are the engines still supplied in case of fuel filter clog?

    <p>Yes, bypassing the fuel filter (crew awareness only)</p> Signup and view all the answers

    What is the minimum fuel quantity for take-off:

    <p>1,500 kg</p> Signup and view all the answers

    Normal hydraulic power is provided by:

    <p>Engine driven pumps for green and yellow, electric pump for blue, electric pump for yellow</p> Signup and view all the answers

    The power transfer unit is:

    <p>Reversible between green and yellow</p> Signup and view all the answers

    In flight, if blue electric pump fails, blue system:

    <p>Can be recovered by RAT</p> Signup and view all the answers

    With both engines stopped, how is it possible to pressurise the green system:

    <p>By the yellow electric pump and the PTU</p> Signup and view all the answers

    The RAT is automatically extended in case of:

    <p>Loss of engine and APU main generators</p> Signup and view all the answers

    On the ground the blue system is pressurised when:

    <p>One engine is running</p> Signup and view all the answers

    Engine 2 Hydraulic pump energises:

    <p>The yellow system pump and the green system via the PTU should the green system pump fail</p> Signup and view all the answers

    The yellow system comprises:

    <p>One engine driven pump, one electric pump, one hand pump</p> Signup and view all the answers

    The green hydraulic system can be pressurised by:

    <p>The No. 1 engine hydraulic pump or PTU</p> Signup and view all the answers

    The priority valves operate in case of:

    <p>Low hydraulic pressure</p> Signup and view all the answers

    The fire shut off valves shut off:

    <p>The yellow and green systems</p> Signup and view all the answers

    In case of blue electric pump failure, when the RAT MAN ON P/B on the HYD overhead panel is pressed:

    <p>The blue hydraulic system is pressurised by the RAT</p> Signup and view all the answers

    The hydraulic reservoirs are pressurised:

    <p>From the No. 1 engine or the pneumatic system</p> Signup and view all the answers

    In flight the engine 1 pump fault light illuminates amber in case of:

    <p>Reservoir low oil pressure, overheat, low pressure, or pump low pressure</p> Signup and view all the answers

    If on the ground with engine one stopped, does the engine one pump fault light illuminate amber due to green pump low pressure?

    <p>No</p> Signup and view all the answers

    In case of reservoir overheat, the fault lights of the faulty system stay on for:

    <p>As long as the overheat is detected</p> Signup and view all the answers

    On ground and before engine start, with blue pump auto and A/C power available, the blue pump is:

    <p>Energised when the blue pump over-ride P/B is pressed</p> Signup and view all the answers

    The blue system includes operation of:

    <p>The slats</p> Signup and view all the answers

    The RAT when extended in flight, pressurises:

    <p>The blue system</p> Signup and view all the answers

    The yellow system includes operation of:

    <p>The right elevator only</p> Signup and view all the answers

    The yellow system may be powered by:

    <p>Engine 2 hydraulic pump or the yellow electric pump or the PTU</p> Signup and view all the answers

    The yellow system includes operation of:

    <p>The flaps</p> Signup and view all the answers

    During first engine start the PTU is:

    <p>Inhibited</p> Signup and view all the answers

    The RAT can be restored:

    <p>On ground only</p> Signup and view all the answers

    In flight the RAT is extended:

    <p>Manually or automatically</p> Signup and view all the answers

    In flight when the RAT is automatically extended:

    <p>The blue hydraulic system is pressurised and the emergency generator runs</p> Signup and view all the answers

    Is it possible to interchange hydraulic fluid from green to yellow or yellow to green system:

    <p>No</p> Signup and view all the answers

    The fire shut off valve closes when:

    <p>The fire P/B is released out</p> Signup and view all the answers

    If the green system is lost, slat operation is:

    <p>Slow</p> Signup and view all the answers

    If the green system is lost, flap operation is:

    <p>Slow</p> Signup and view all the answers

    The green system operates:

    <p>Spoilers 1 &amp; 5</p> Signup and view all the answers

    The green system operates:

    <p>The left elevator</p> Signup and view all the answers

    The green system operates:

    <p>Both ailerons</p> Signup and view all the answers

    The green system operates:

    <p>Reverser 1</p> Signup and view all the answers

    The yellow system operates:

    <p>Reverser 2</p> Signup and view all the answers

    On ground, blue electric pump P/B at auto, the circuit is energised if:

    <p>One engine is running or blue pump override P/B has been pressed</p> Signup and view all the answers

    If the blue system is lost, the slats are:

    <p>Slow</p> Signup and view all the answers

    If blue system is lost, the flaps are:

    <p>Normal</p> Signup and view all the answers

    The blue system operates:

    <p>Spoiler 3</p> Signup and view all the answers

    The RAT can be extended:

    <p>Both manually from the overhead panel and automatically in case of loss of power to AC BUS 1 &amp; AC BUS 2</p> Signup and view all the answers

    The blue system operates:

    <p>Both ailerons</p> Signup and view all the answers

    Can you operate a cargo door when no electrical power is available:

    <p>Yes, using the hand pump</p> Signup and view all the answers

    Yellow electric pump P/B switch off and cargo door manual selector valve set at open or close position, the PTU and flight controls are:

    <p>Inhibited</p> Signup and view all the answers

    If yellow system is lost, the slats are:

    <p>Normal</p> Signup and view all the answers

    If yellow system is lost, the flaps are:

    <p>Slow</p> Signup and view all the answers

    The engine 2 fire valve is between the yellow reservoir and:

    <p>The engine 2 hydraulic pump</p> Signup and view all the answers

    The yellow system operates:

    <p>Spoilers 2 &amp; 4</p> Signup and view all the answers

    In case of single hydraulic system low pressure:

    <p>The master caution light illuminates and the single chime sounds</p> Signup and view all the answers

    In case of reservoir low air pressure, the hydraulic system affected is:

    <p>May be recovered after descending to a lower altitude</p> Signup and view all the answers

    With a dual hydraulic system failure, the flight control law (before gear extension) is:

    <p>Alternate law</p> Signup and view all the answers

    With green hydraulic system lost:

    <p>The landing gear must be extended by gravity</p> Signup and view all the answers

    With green hydraulic system lost:

    <p>The NWS is lost</p> Signup and view all the answers

    With green hydraulic system lost, the braking system is:

    <p>Alternate</p> Signup and view all the answers

    With green hydraulic system lost, the anti-skid is:

    <p>Operative on the yellow hydraulic system</p> Signup and view all the answers

    PTU at auto, the PTU automatically runs

    <p>When differential pressure between green and yellow systems is more than 500 pSI</p> Signup and view all the answers

    PTU running the pressure delivered by the PTU is:

    <p>Stable at normal system pressure (3,000 psi)</p> Signup and view all the answers

    Hydraulic green system only remaining, the auto-pilot function is:

    <p>Lost</p> Signup and view all the answers

    Hydraulic green system only remaining, the horizontal stabilizer is:

    <p>Available</p> Signup and view all the answers

    With green and yellow hydraulic systems lost, manual pitch trim (stabilizer) is:

    <p>Lost</p> Signup and view all the answers

    Hydraulic green system only remaining, the auto brake is:

    <p>Available</p> Signup and view all the answers

    With hydraulic blue system only remaining:

    <p>Seven full brake applications are available</p> Signup and view all the answers

    Study Notes

    Fuel System

    • Normally, fuel quantity of each tank can be checked via the fuel quantity indicator
    • There are pumps in the wing and center tanks, but the number is not specified
    • With all fuel pumps on, wing tank pumps do not run while center tank is supplying
    • Each wing tank has 3 cells (excluding surge/vent tank)
    • Surge tank is located in the center tank and scavenges fuel into the adjacent cell
    • Fuel x-feed is controlled by an electric motor
    • Transfer valves are located in the center tank and wing tanks
    • Pressure relief sequence valves maintain a safe fuel pressure
    • Each engine is normally supplied by its corresponding wing tank

    Fuel Imbalance and Indications

    • Maximum fuel imbalance is 1000 kg (inner tanks with heavier tank full)
    • Fuel used indication is automatically reset at fuel level 150 kg
    • Amber fault light on tank pump P/B indicates fault in the corresponding tank pump
    • Amber fault light on 'mode sel.' P/B indicates fault in the mode selector switch
    • FOB boxed amber on ECAM fuel page means less than 150 kg of fuel remaining
    • Fuel on board half boxed amber on upper ECAM means less than 300 kg of fuel remaining

    Center Tank and Transfer Valves

    • Center tank pumps run on ground with slats extended
    • Mode selector push-button controls the fuel mode (auto or manual)
    • When center tank is empty (mode auto), center tank pumps switch off
    • Transfer valves close when the fuel level in the center tank reaches 450 kg
    • Transfer valves are used to transfer fuel from center tank to wing tanks
    • IDG cooling fuel is returned to the fuel tank when the outer cells are full
    • IDG cooling fuel is returned to the fuel tank when the wing tank is full

    APU and X-Feed

    • APU fuel is supplied by the center tank
    • Fuel is used by the electrical system for APU and IDG cooling
    • Crossfeed valve is normally closed
    • Engines are still supplied in case of fuel filter clog

    Hydraulic System

    • Normal hydraulic power is provided by the engine-driven pumps
    • Power transfer unit (PTU) provides hydraulic power to the yellow system
    • blue system is pressurised when the blue electric pump is on
    • Green hydraulic system can be pressurised by the engine-driven pump or PTU
    • Yellow system comprises the yellow reservoir, electric pump, and PTU
    • Priority valves operate in case of a system failure
    • Fire shut-off valves shut off the fuel supply to the engine in case of a fire

    RAT and Reservoir

    • RAT (Ram Air Turbine) is automatically extended in case of dual engine failure
    • Hydraulic reservoirs are pressurised by the engine-driven pumps
    • RAT can be restored by switching off the RAT MAN ON P/B
    • RAT pressurises the yellow system when extended in flight
    • Reservoir overheat fault lights stay on for 5 minutes
    • On ground, blue pump is auto and A/C power available, the blue pump is energised

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