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Aircraft Engine Fuel System

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Questions and Answers

What is the primary function of the engine fuel system?

To control the airflow into the engine
To regulate the oil temperature in the engine
To reduce the fuel pressure to a level suitable for the combustion chamber
To increase the fuel pressure to a value that the fuel nozzles in the combustion chamber can use (correct)

What happens to the low pressure fuel cock when the engine fire control handle is activated?

It is manually shut by the pilot
It remains unchanged
It can be shut automatically (correct)
It opens automatically to supply more fuel

Why is the low pressure fuel pump used to shut down the engine instead of the high pressure fuel cock?

Because it is a safer way to shut down the engine
Because it is a more efficient way to shut down the engine
Because it is a faster way to shut down the engine
Because it takes much longer to shut down the engine (correct)

What is the purpose of the fuel cooled oil cooler?

To cool the oil and heat the fuel (B) Signup and view all the answers

What drives the low pressure fuel pump?

The engine's accessory gearbox (C) Signup and view all the answers

What is the result of raising the temperature of the fuel in the fuel system?

Elimination of ice crystals (D) Signup and view all the answers

What is the primary purpose of the non-return valves in the engine fuel system?

To prevent fuel from flowing back to the booster pumps (D) Signup and view all the answers

What would happen if the low pressure fuel cock is shut automatically?

The fuel supply to the engine will be interrupted (A) Signup and view all the answers

What is the function of the valve in the oil cooler feed line?

To maintain the oil pressure higher than the fuel pressure (B) Signup and view all the answers

What would happen if the low pressure fuel pump fails to maintain positive pressure?

The fuel supply to the engine will be interrupted (C) Signup and view all the answers

What is the advantage of using the low pressure fuel cock to shut down the engine?

It is not recommended and will take longer to shut down the engine (A) Signup and view all the answers

What is the primary function of the booster pumps in the engine fuel system?

To pass fuel through the non-return valves (A) Signup and view all the answers

What is the purpose of the engine accessory gearbox?

To drive the low pressure fuel pump (B) Signup and view all the answers

What is the result of the fuel being heated in the fuel cooled oil cooler?

It prevents the formation of ice crystals in the fuel system (A) Signup and view all the answers

What would happen if the high pressure fuel cock is used to shut down the engine?

The engine will shut down immediately (D) Signup and view all the answers

What is the primary function of the fuel cooled oil cooler in the engine fuel system?

To serve the dual purpose of cooling oil and heating fuel (D) Signup and view all the answers