Aircraft Fuel System Components Quiz
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Questions and Answers

What position is a fuel crossfeed valve usually in during flight?

  • The closed position (correct)
  • Its last position
  • A position based on pressure
  • The open position

    • Where are sliding couplings in fuel systems typically used?

  • Air or vapor systems (correct)
  • Mechanical systems
  • Low pressure systems
  • High pressure systems

    • How is a fuel cross-feed valve lubricated?

  • By an external lubricant
  • By air
  • By the fuel (correct)
  • By internal cooling

    • Which power source is used to operate fuel cross feed valves?

    <p>28 V DC bus</p> Signup and view all the answers

    What is a requirement for interconnected fuel systems?

    <p>Interconnected air spaces</p> Signup and view all the answers

    How does system capacitance change as fuel level increases?

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

    What happens when refueling an aircraft?

    <p>The fuel nozzle will automatically cut off when the tank is full</p> Signup and view all the answers

    Why is it important not to fill the expansion space in the fuel tank?

    <p>To allow for fuel expansion due to temperature changes</p> Signup and view all the answers

    What is the purpose of Biopor microbial fuel growth treatment?

    <p>To be added to the fuel and burned during flight</p> Signup and view all the answers

    What is the typical appearance of microbial growth in fuel?

    <p>Brown-black slime</p> Signup and view all the answers

    How are bladder-type fuel tanks secured?

    <p>Press-type rivets</p> Signup and view all the answers

    During a zero fuel test on a fuel quantity indicating system, the tanks should be:

    <p>Empty, except for unusable fuel</p> Signup and view all the answers

    After replacing a fuel tank bladder, where should a fuel flow test be carried out?

    <p>At the engine inlet</p> Signup and view all the answers

    In a biologically contaminated fuel tank, corrosion is most likely to occur:

    <p>Below the fungal colonies</p> Signup and view all the answers

    If an aircraft has the ability to transfer fuel in-flight, what provision must be made?

    <p>Shut off fuel before structural damage occurs</p> Signup and view all the answers

    In a fuel system with interconnected vents, what is the required expansion space?

    <p>2% of the total tank capacity</p> Signup and view all the answers

    When a FADEC (Full Authority Digital Engine Control) system loses air data input, it goes into:

    <p>Soft reversion mode</p> Signup and view all the answers

    What should be done before fitting Calcium Chromate tablets in integral tanks?

    <p>Soaking the tablets in water</p> Signup and view all the answers

    Why is a check valve fitted to a fuel jettison system?

    <p>To prevent dumping of inner tanks</p> Signup and view all the answers

    Which of the following is an advantage of integral fuel tanks?

    <p>Use the maximum volume for fuel and have the minimum weight</p> Signup and view all the answers

    How is fuel delivered to each engine on large transport aircraft?

    <p>Through the same system for all engines</p> Signup and view all the answers

    In the context of the text, what does 'seep' refer to?

    <p>Leaking gradually</p> Signup and view all the answers

    Based on the text, what is the purpose of using calcium chromate tablets?

    <p>To prevent rusting in integral tanks</p> Signup and view all the answers

    What is the role of a wetted linen bag during the installation process?

    <p>To keep the tablets dry</p> Signup and view all the answers

    'Dumping of outer tanks' refers to:

    <p>'Dumping' fuel from outer wing tanks before landing</p> Signup and view all the answers

    'Parallel system' in aviation typically means:

    <p>'Parallel system' of fuel transfer between tanks</p> Signup and view all the answers

    Which of the following is the correct reason for having some fuel left in the fuel tanks?

    <p>To prevent sealant from deteriorating/drying out</p> Signup and view all the answers

    How are integral fuel booster pumps cooled?

    <p>By the fuel itself</p> Signup and view all the answers

    What is the purpose of a scavenge system within a fuel system?

    <p>To disperse water in the fuel, reducing microbiological contamination</p> Signup and view all the answers

    In a light fixed-wing aircraft, the fuel warning light indicates:

    <p>Ice blockage, filter pop, or pump failure</p> Signup and view all the answers

    How is fuel supplied to a turbine engine?

    <p>By a fuel boost pump</p> Signup and view all the answers

    A fuel tank suction valve will open when:

    <p>The booster pump fails</p> Signup and view all the answers

    To prevent water condensation in a fuel tank, the tank should:

    <p>Be filled as full as possible</p> Signup and view all the answers

    To protect the center tank fuselage area from vapor buildup, what is typically used?

    <p>Cabin air bled around the tank</p> Signup and view all the answers

    When a fuel jettison valve is in transit, the magnetic indicator would show:

    <p>Amber and cross-line</p> Signup and view all the answers

    Which type of fuel tank construction is most prone to leaks?

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

    What is the typical position of a fuel crossfeed valve during flight?

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

    Where are sliding couplings commonly used in fuel systems?

    <p>Air or vapor systems</p> Signup and view all the answers

    How is a fuel cross-feed valve typically lubricated?

    <p>By the fuel itself</p> Signup and view all the answers

    What power source is commonly used to operate fuel cross-feed valves?

    <p>28V DC bus</p> Signup and view all the answers

    In interconnected fuel systems, how should the air spaces be configured?

    <p>Air spaces interconnected</p> Signup and view all the answers

    How does system capacitance change as fuel level increases?

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

    What is the purpose of using calcium chromate tablets in integral fuel tanks?

    <p>To wet the linen bag before installation</p> Signup and view all the answers

    Why is a check valve fitted to a fuel jettison system?

    <p>To prevent the dumping of the outer tanks</p> Signup and view all the answers

    What is an advantage of integral fuel tanks?

    <p>They use the maximum volume for fuel and have the minimum amount of weight</p> Signup and view all the answers

    How is fuel delivered to each engine on large transport aircraft?

    <p>Using the same system for each engine</p> Signup and view all the answers

    What should be done before fitting calcium chromate tablets in integral tanks?

    <p>Wet the linen bag with water</p> Signup and view all the answers

    What does 'seep' refer to in the context of the text?

    <p>The flow of fuel through a leak</p> Signup and view all the answers

    What is the purpose of a shroud vent and overboard drain on fuel tank vent pipes?

    <p>To protect the center tank fuselage area from a vapor build up</p> Signup and view all the answers

    When a fuel jettison valve is in transit, the magnetic indicator would show which color and position?

    <p>Amber and cross line</p> Signup and view all the answers

    Which type of fuel tank construction is most prone to leaks?

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

    What is the typical power source used to operate fuel cross feed valves?

    <p>Two 28V DC motors</p> Signup and view all the answers

    Why is it important to have some fuel left in the fuel tanks?

    <p>To prevent the fuel from deteriorating or drying out</p> Signup and view all the answers

    How are integral fuel booster pumps cooled?

    <p>The fuel itself provides the cooling</p> Signup and view all the answers

    What is the purpose of the fuel tank suction valve?

    <p>To open when the booster pump fails</p> Signup and view all the answers

    How is fuel supplied to a turbine engine?

    <p>By a fuel boost pump</p> Signup and view all the answers

    What is the purpose of a fuel scavenge system?

    <p>To ensure that any water in the fuel is constantly dispersed thus reducing microbiological contamination</p> Signup and view all the answers

    To prevent water condensation in a fuel tank, what should be done?

    <p>The tank should be filled as full as possible</p> Signup and view all the answers

    What is the correct way to treat biologically contaminated fuel according to the text?

    <p>Adding it to the fuel and burning it</p> Signup and view all the answers

    In a fuel system with interconnected vents, why is an expansion space required?

    <p>To accommodate fuel expansion due to temperature changes</p> Signup and view all the answers

    What is the typical appearance of microbial growth in fuel according to the text?

    <p>Green sludge</p> Signup and view all the answers

    What should be done during a zero fuel test on a quantity indicating system according to the text?

    <p>Empty the tanks except for unusable fuel</p> Signup and view all the answers

    How should bladder-type fuel tanks be secured based on the text?

    <p>Using contact adhesive</p> Signup and view all the answers

    What is the purpose of an anti-corona device fitted to the fuel jettison pipe?

    <p>To reduce vaporization of fuel</p> Signup and view all the answers

    Why are cross feed valves installed in aircraft fuel systems?

    <p>To balance fuel load between tanks</p> Signup and view all the answers

    During pressure refueling, at what PSI is it typically carried out based on the text?

    <p>$20$ PSI</p> Signup and view all the answers

    Study Notes

    Fuel Systems

    • It is important not to fill the expansion space in the tank.

    Biopor Microbial Fuel Growth Treatment

    • Biopor is added to the fuel and burnt.

    Microbial Growth

    • Microbial growth is characterized by brown-black slime.

    Bladder Type Fuel Tanks

    • Bladder type fuel tanks are secured by press type rivets.

    Zero Fuel Test

    • A zero fuel test on a fuel quantity indicating system is carried out with tanks empty apart from unusable fuel.

    Fuel Flow Test

    • A fuel flow test should be carried out at the engine inlet.

    Corrosion in Fuel Tanks

    • Corrosion takes place below the fungal colonies in biologically contaminated fuel.

    Fuel Transfer in Flight

    • Provision must be made to shut off fuel before structural damage when an aircraft has the ability to transfer fuel in flight.

    Interconnected Vents

    • The expansion space must be 2% of the tank capacity in a fuel system with interconnected vents.

    Fuel Tanks Interconnectedness

    • Protection against overfill for tanks and fuel systems is required for fuel tanks interconnectedness.

    FADEC System

    • When a FADEC system loses air data input, it goes to soft reversion.

    Pressure Refuelling

    • Pressure refuelling is carried out at 40 PSI.

    Cross Feed Valves

    • Cross feed valves permit fuel transfer from any tank to any engine.

    Fuel Jettison Pipe

    • An anti-corona device is fitted to the fuel jettison pipe to prevent vaporisation.

    Fuel Contents Gauge

    • The capacitance in a fuel contents gauge decreases as fuel is used.

    Fuel Tank Storage

    • When an aircraft is put into storage for medium/long periods, the fuel tanks should be run to prevent sealant from deteriorating/drying out.

    Calcium Chromate Tablets

    • Calcium Chromate tablets can be fitted in integral tanks; before installation, the linen bag should be wetted with water.

    Check Valve

    • A check valve is fitted to a fuel jettison system to prevent the dumping of the outer tanks.

    Integral Fuel Tanks

    • Integral fuel tanks use the maximum volume for fuel and have the minimum amount of weight.

    Large Transport Aircraft Fuel Delivery

    • Fuel is delivered to each engine using the same system for each engine.

    And many more...### Fuel Systems

    • It is important not to fill the expansion space in the tank.
    • Biopor microbial fuel growth treatment is added to the fuel and burnt.
    • Microbial growth appears as brown black slime.

    Fuel Tanks

    • Bladder type fuel tanks are secured by press type rivets.
    • In a fuel system with interconnected vents, the expansion space must be 2% of the tank capacity.
    • Fuel tanks interconnected must have protection against overfill for tanks and fuel system.

    Fuel Testing

    • A zero fuel test on a fuel quantity indicating system is carried out with tanks empty apart from unusable fuel.
    • After a tank bag has been replaced, a fuel flow test should be carried out at the engine inlet.

    Corrosion and Contamination

    • In biologically contaminated fuel, corrosion takes place below the fungal colonies.

    Fuel Transfer and Shut Off

    • If an aircraft has ability to transfer fuel in flight, provision must be made to shut off fuel before structural damage.
    • Cross feed valves permit fuel transfer from any tank to any engine.

    Fuel Pressure and Refueling

    • Pressure refuelling is carried out at up to 50 psi.
    • Fuel jettison pipes are fitted with an anti-corona device to prevent vaporisation.

    Fuel Gauges

    • As fuel is used, the capacitance in a fuel contents gauge decreases.

    Aircraft Storage

    • When an aircraft is put into storage for medium/long periods, the fuel tanks should be treated accordingly.

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    Description

    Test your knowledge on aircraft fuel system components like fuel crossfeed valves and sliding couplings. Determine the correct positions and applications of these crucial components in aviation fuel systems.

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