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

Where are sliding couplings in fuel systems typically used?

Air or vapor systems

How is a fuel cross-feed valve lubricated?

By the fuel

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

28 V DC bus Signup and view all the answers

What is a requirement for interconnected fuel systems?

Interconnected air spaces Signup and view all the answers

How does system capacitance change as fuel level increases?

Increases Signup and view all the answers

What happens when refueling an aircraft?

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

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

To allow for fuel expansion due to temperature changes Signup and view all the answers

What is the purpose of Biopor microbial fuel growth treatment?

To be added to the fuel and burned during flight Signup and view all the answers

What is the typical appearance of microbial growth in fuel?

Brown-black slime Signup and view all the answers

How are bladder-type fuel tanks secured?

Press-type rivets Signup and view all the answers

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

Empty, except for unusable fuel Signup and view all the answers

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

At the engine inlet Signup and view all the answers

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

Below the fungal colonies Signup and view all the answers

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

Shut off fuel before structural damage occurs Signup and view all the answers

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

2% of the total tank capacity Signup and view all the answers

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

Soft reversion mode Signup and view all the answers

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

Soaking the tablets in water Signup and view all the answers

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

To prevent dumping of inner tanks Signup and view all the answers

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

Use the maximum volume for fuel and have the minimum weight Signup and view all the answers

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

Through the same system for all engines Signup and view all the answers

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

Leaking gradually Signup and view all the answers

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

To prevent rusting in integral tanks Signup and view all the answers

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

To keep the tablets dry Signup and view all the answers

'Dumping of outer tanks' refers to:

'Dumping' fuel from outer wing tanks before landing Signup and view all the answers

'Parallel system' in aviation typically means:

'Parallel system' of fuel transfer between tanks Signup and view all the answers

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

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

How are integral fuel booster pumps cooled?

By the fuel itself Signup and view all the answers

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

To disperse water in the fuel, reducing microbiological contamination Signup and view all the answers

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

Ice blockage, filter pop, or pump failure Signup and view all the answers

How is fuel supplied to a turbine engine?

By a fuel boost pump Signup and view all the answers

A fuel tank suction valve will open when:

The booster pump fails Signup and view all the answers

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

Be filled as full as possible Signup and view all the answers

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

Cabin air bled around the tank Signup and view all the answers

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

Amber and cross-line Signup and view all the answers

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

Integral Signup and view all the answers

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

Closed Signup and view all the answers

Where are sliding couplings commonly used in fuel systems?

Air or vapor systems Signup and view all the answers

How is a fuel cross-feed valve typically lubricated?

By the fuel itself Signup and view all the answers

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

28V DC bus Signup and view all the answers

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

Air spaces interconnected Signup and view all the answers

How does system capacitance change as fuel level increases?

Increases Signup and view all the answers

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

To wet the linen bag before installation Signup and view all the answers

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

To prevent the dumping of the outer tanks Signup and view all the answers

What is an advantage of integral fuel tanks?

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

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

Using the same system for each engine Signup and view all the answers

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

Wet the linen bag with water Signup and view all the answers

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

The flow of fuel through a leak Signup and view all the answers

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

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

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

Amber and cross line Signup and view all the answers

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

Integral Signup and view all the answers

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

Two 28V DC motors Signup and view all the answers

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

To prevent the fuel from deteriorating or drying out Signup and view all the answers

How are integral fuel booster pumps cooled?

The fuel itself provides the cooling Signup and view all the answers

What is the purpose of the fuel tank suction valve?

To open when the booster pump fails Signup and view all the answers

How is fuel supplied to a turbine engine?

By a fuel boost pump Signup and view all the answers

What is the purpose of a fuel scavenge system?

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

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

The tank should be filled as full as possible Signup and view all the answers

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

Adding it to the fuel and burning it Signup and view all the answers

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

To accommodate fuel expansion due to temperature changes Signup and view all the answers

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

Green sludge Signup and view all the answers

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

Empty the tanks except for unusable fuel Signup and view all the answers

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

Using contact adhesive Signup and view all the answers

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

To reduce vaporization of fuel Signup and view all the answers

Why are cross feed valves installed in aircraft fuel systems?

To balance fuel load between tanks Signup and view all the answers

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

$20$ PSI 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.