Podcast
Questions and Answers
What component of the fuel pump gives an initial pressure increase and pumps fuel to the gear elements?
What component of the fuel pump gives an initial pressure increase and pumps fuel to the gear elements?
- Impeller (correct)
- Shear section
- Relief valve
- Check valve
Why are shear sections incorporated into the drive system of each gear element?
Why are shear sections incorporated into the drive system of each gear element?
- To mix fuel with air
- To prevent fuel recirculation
- To create additional pressure
- To allow for independent operation if one element fails (correct)
What is the purpose of the check valves in the fuel pump system?
What is the purpose of the check valves in the fuel pump system?
- To increase pressure
- To control fuel flow rate
- To prevent recirculation through the inoperative element (correct)
- To mix fuel with air
Why is one element of the duplex spur gear pump capable of supplying sufficient fuel for most engine demands?
Why is one element of the duplex spur gear pump capable of supplying sufficient fuel for most engine demands?
What happens to excess fuel not required by the engine in the fuel pump system?
What happens to excess fuel not required by the engine in the fuel pump system?
Which component allows for the recirculation of excess fuel in the fuel pump system?
Which component allows for the recirculation of excess fuel in the fuel pump system?
In the duplex spur gear pump assembly, how many gear elements are present?
In the duplex spur gear pump assembly, how many gear elements are present?
What role does the relief valve play in the fuel pump system?
What role does the relief valve play in the fuel pump system?
What happens to the inlet ram air pressure and mass airflow when an aircraft increases in speed or descends?
What happens to the inlet ram air pressure and mass airflow when an aircraft increases in speed or descends?
In governed operation, when the engine speed is set and not changed, what variables can affect the engine's operation?
In governed operation, when the engine speed is set and not changed, what variables can affect the engine's operation?
What senses the changes in inlet air pressure and mass airflow during aircraft speed or altitude changes?
What senses the changes in inlet air pressure and mass airflow during aircraft speed or altitude changes?
During descent or slowing down, what happens to the inlet air pressure and mass airflow?
During descent or slowing down, what happens to the inlet air pressure and mass airflow?
What is the role of the multiplying lever during governed operation of the engine?
What is the role of the multiplying lever during governed operation of the engine?
How does the engine react to changes in aircraft speed or altitude during steady operation?
How does the engine react to changes in aircraft speed or altitude during steady operation?
What is set at a certain position and not changed during governed operation of the engine?
What is set at a certain position and not changed during governed operation of the engine?
Which component of the engine moves in response to changes in inlet air pressure and mass airflow?
Which component of the engine moves in response to changes in inlet air pressure and mass airflow?
What does the spring located in the downstream side of the control piston do?
What does the spring located in the downstream side of the control piston do?
How does the control piston act upon the ball valve?
How does the control piston act upon the ball valve?
What happens to the pressure differential across the throttle as inlet pressure decreases?
What happens to the pressure differential across the throttle as inlet pressure decreases?
During engine start, what does the pump servo piston spring do?
During engine start, what does the pump servo piston spring do?
Where does fuel flow during engine start, passing through the throttle valve?
Where does fuel flow during engine start, passing through the throttle valve?
What is the initial position of the throttle at rest?
What is the initial position of the throttle at rest?
What does the spring do when the control piston senses no differential pressure?
What does the spring do when the control piston senses no differential pressure?
What does the supervisory electronic engine control system do?
What does the supervisory electronic engine control system do?
Which signals does the control amplifier receive in the system?
Which signals does the control amplifier receive in the system?
How does the pressure regulator function in this system?
How does the pressure regulator function in this system?
At what point does the electronic circuit start to function as a fuel limiting device in this system?
At what point does the electronic circuit start to function as a fuel limiting device in this system?
What happens when predetermined TGT and compressor speed values are reached in this system?
What happens when predetermined TGT and compressor speed values are reached in this system?
Which signals does the fuel flow regulator receive in this control system?
Which signals does the fuel flow regulator receive in this control system?
How does the fuel flow regulator adjust fuel flow in this system?
How does the fuel flow regulator adjust fuel flow in this system?
What does the electronic circuit start to function as when near full power is reached?
What does the electronic circuit start to function as when near full power is reached?
Where is the fuel flow transmitter typically located?
Where is the fuel flow transmitter typically located?
What does a fuel flow transmitter measure?
What does a fuel flow transmitter measure?
What can higher than normal fuel consumption in one engine compared to another indicate?
What can higher than normal fuel consumption in one engine compared to another indicate?
Which type of transmitter is shown in Figure 30?
Which type of transmitter is shown in Figure 30?
What does the vane in the rotating vane transmitter carry at one end?
What does the vane in the rotating vane transmitter carry at one end?
What type of output signal does the fuel flow transmitter produce?
What type of output signal does the fuel flow transmitter produce?
Why are fuel flow transmitters used in multi-engine aircraft?
Why are fuel flow transmitters used in multi-engine aircraft?
What does a higher than normal fuel consumption for a given power setting suggest?
What does a higher than normal fuel consumption for a given power setting suggest?
Which part of the fuel flow transmitter forms a magnetic coupling with the electrical transmitting unit?
Which part of the fuel flow transmitter forms a magnetic coupling with the electrical transmitting unit?
What kind of device is a fuel flow transmitter?
What kind of device is a fuel flow transmitter?
