Fuel indications Flashcards
What is the primary purpose of monitoring fuel pressure in an aircraft engine?
To give the flight crew an early warning of a fuel system malfunction.
Where is the low-pressure sensor typically positioned in an aircraft fuel system?
After the outlet from the low-pressure filter.
What does a differential pressure sensor across the fuel filter indicate?
It gives a warning of an impending filter blockage and the risk of cavitation.
What kind of gauge is used in light reciprocating engine aircraft to monitor fuel pressure?
A direct reading Bourdon tube pressure gauge.
How do modern aircraft with more complex fuel systems measure fuel pressure?
They use a sensor with a transducer that sends electrical signals to a flight deck gauge.
What type of fuel pressure gauge is used in complex and larger reciprocating engine aircraft?
A differential fuel pressure gauge, typically a bellows type.
What is the purpose of the low fuel pressure warning light?
To alert the flight crew when the fuel pressure falls outside the normal operating range.
Where is the low-pressure warning switch located in most turbine-powered aircraft?
At the outlet of each fuel boost pump.
Why is monitoring fuel temperature critical in an aircraft?
To inform the flight crew when the temperature causes ice to form in the fuel system and filter.
What type of sensor is commonly used to monitor fuel temperature in large high-performance turbine aircraft?
A resistance-type electric fuel temperature sender.
How can low fuel temperature be corrected in some aircraft?
By using a fuel heater.
What are the two indications provided by the fuel flow indicating system?
The actual fuel flow to the engines and the fuel used since the engine was started.
How is the actual fuel quantity calculated during a flight?
By subtracting the amount of used fuel from the amount of fuel in the tanks at take-off.
What is the purpose of the fuel-used indication?
To show the mass of fuel burned since the last engine start, allowing comparison of engine performance.
Where is the fuel flow transmitter located in an aircraft engine?
Between the fuel control unit and the fuel nozzles.
