Podcast
Questions and Answers
What are some factors that fuel control units take into account?
What are some factors that fuel control units take into account?
- Combustion pressure, aircraft speed, and propeller blade angle
- Power lever angle, turbine gas temperature, and aircraft speed
- Inlet air temperature, engine RPM, and combustion pressure (correct)
- Inlet air pressure, propeller blade angle, and engine speed
Why does the FCU on a turbo-propeller engine need to make allowance for propeller blade angle?
Why does the FCU on a turbo-propeller engine need to make allowance for propeller blade angle?
- To regulate the high pressure compressor
- To increase fuel flow during acceleration
- To maintain constant engine speed during changing propeller loads (correct)
- To control the accessory gearbox
What is a key consideration during the transient states of acceleration and deceleration?
What is a key consideration during the transient states of acceleration and deceleration?
- Preventing compressor stall
- Maintaining constant engine speed (correct)
- Achieving the most rapid acceleration possible
- Using more fuel than allowed limits
Why is it necessary to balance fuel flow changes during deceleration?
Why is it necessary to balance fuel flow changes during deceleration?
What drives the FCU on a single spool engine?
What drives the FCU on a single spool engine?
Why must the FCU on dual and triple spool engines be driven by the high pressure compressor?
Why must the FCU on dual and triple spool engines be driven by the high pressure compressor?
What undesirable conditions can occur if too much fuel is used during acceleration?
What undesirable conditions can occur if too much fuel is used during acceleration?
Why is close control of fuel needed during acceleration and deceleration?
Why is close control of fuel needed during acceleration and deceleration?
What is the main purpose of an integrated fuel flow system?
What is the main purpose of an integrated fuel flow system?
Which component of the fuel flow transmitter imparts swirl and angular velocity to the fuel?
Which component of the fuel flow transmitter imparts swirl and angular velocity to the fuel?
What is the function of the two pick-off assemblies in the fuel flow transmitter?
What is the function of the two pick-off assemblies in the fuel flow transmitter?
How are the outer drum and impeller in the fuel flow transmitter connected?
How are the outer drum and impeller in the fuel flow transmitter connected?
Which component in the fuel flow system is responsible for driving the impeller assembly at a constant speed?
Which component in the fuel flow system is responsible for driving the impeller assembly at a constant speed?
What happens to the magnets in the pick-off assemblies under zero fuel flow conditions?
What happens to the magnets in the pick-off assemblies under zero fuel flow conditions?
What is the role of the housing in the fuel flow transmitter?
What is the role of the housing in the fuel flow transmitter?
In an integrated fuel flow system, why are both fuel used and fuel flow displayed using a single instrument?
In an integrated fuel flow system, why are both fuel used and fuel flow displayed using a single instrument?
What is the main function of a supervisory electronic engine control system?
What is the main function of a supervisory electronic engine control system?
Which signals does the control amplifier in the supervisory electronic engine control system receive?
Which signals does the control amplifier in the supervisory electronic engine control system receive?
At what point does the electronic circuit in the control system start to function as a fuel limiting device?
At what point does the electronic circuit in the control system start to function as a fuel limiting device?
How does the pressure regulator in this control system affect fuel flow to the spray nozzles?
How does the pressure regulator in this control system affect fuel flow to the spray nozzles?
Which signals does the fuel flow regulator in this control system receive to regulate fuel flow to the engine?
Which signals does the fuel flow regulator in this control system receive to regulate fuel flow to the engine?
What does the control system do until near full power is reached?
What does the control system do until near full power is reached?
Which component regulates fuel pressure at the fuel pump in this system?
Which component regulates fuel pressure at the fuel pump in this system?
What does the governor bellows pressure (Py) control?
What does the governor bellows pressure (Py) control?
What initiates the closing of the governor valve during acceleration?
What initiates the closing of the governor valve during acceleration?
How do pressures Px and Py change when the governor valve is closed?
How do pressures Px and Py change when the governor valve is closed?
What happens to the metering valve when pressure Px increases?
What happens to the metering valve when pressure Px increases?
How is fuel flow matched with airflow through the engine in the system design?
How is fuel flow matched with airflow through the engine in the system design?
What is evacuated in the acceleration bellows assembly to provide an absolute pressure reference?
What is evacuated in the acceleration bellows assembly to provide an absolute pressure reference?
What occurs when the desired RPM is reached by the governor?
What occurs when the desired RPM is reached by the governor?
How does the acceleration bellows assembly respond to a rise in RPM?
How does the acceleration bellows assembly respond to a rise in RPM?
What type of system is used for engine control in a supervisory engine electronic control?
What type of system is used for engine control in a supervisory engine electronic control?
Which of the following is NOT a functional difference between a supervisory engine electronic control and a FADEC engine fuel management system?
Which of the following is NOT a functional difference between a supervisory engine electronic control and a FADEC engine fuel management system?
What is the primary function of a FADEC engine fuel management system?
What is the primary function of a FADEC engine fuel management system?
In comparison to a FADEC engine fuel management system, what control aspect does a supervisory engine electronic control primarily focus on?
In comparison to a FADEC engine fuel management system, what control aspect does a supervisory engine electronic control primarily focus on?
Which component is more emphasized in a FADEC engine fuel management system compared to a supervisory engine electronic control?
Which component is more emphasized in a FADEC engine fuel management system compared to a supervisory engine electronic control?
What aspect of engine control does a supervisory engine electronic control prioritize over a FADEC system?
What aspect of engine control does a supervisory engine electronic control prioritize over a FADEC system?
When comparing a supervisory engine electronic control and a FADEC system, which one is more focused on real-time adjustments during operation?
When comparing a supervisory engine electronic control and a FADEC system, which one is more focused on real-time adjustments during operation?
What distinguishes the functionality of a FADEC engine fuel management system from that of a supervisory engine electronic control?
What distinguishes the functionality of a FADEC engine fuel management system from that of a supervisory engine electronic control?
