Podcast
Questions and Answers
What is the primary function of the flyweights in the governor?
What is the primary function of the flyweights in the governor?
- To directly control the fuel metering valve position
- To regulate hydraulic pressure in the system
- To initiate fuel flow based on temperature
- To adjust the opening of the governor valve based on rpm changes (correct)
How does a hydro-pneumatic fuel control unit (FCU) differ from a hydromechanical FCU?
How does a hydro-pneumatic fuel control unit (FCU) differ from a hydromechanical FCU?
- The hydro-pneumatic FCU has a pneumatic coupling instead of mechanical linkage (correct)
- The hydro-pneumatic FCU is only used in high-altitude engines
- The hydromechanical FCU relies solely on temperature sensors
- The hydro-pneumatic FCU uses an electric actuator
What happens to the metering valve when there is a rise in rpm?
What happens to the metering valve when there is a rise in rpm?
- The metering valve closes slightly (correct)
- The metering valve opens wide
- The metering valve remains in a fixed position
- The metering valve opens fully
What role does the pneumatic computing section play in a hydro-pneumatic FCU?
What role does the pneumatic computing section play in a hydro-pneumatic FCU?
What is the effect of closing the governor valve on acceleration control pressure?
What is the effect of closing the governor valve on acceleration control pressure?
How does the bellows assembly respond to decreased N1 rpm?
How does the bellows assembly respond to decreased N1 rpm?
What influences the fuel flow rates in a hydro-pneumatic FCU?
What influences the fuel flow rates in a hydro-pneumatic FCU?
What occurs to the governor pressure (Py) when the governor valve is closed?
What occurs to the governor pressure (Py) when the governor valve is closed?
What is the primary influence on the hydro-pneumatic fuel control unit for maintaining the correct air-fuel ratio?
What is the primary influence on the hydro-pneumatic fuel control unit for maintaining the correct air-fuel ratio?
Which component ensures a constant pressure drop across the metering head in the fuel control unit?
Which component ensures a constant pressure drop across the metering head in the fuel control unit?
What characteristic of Tt2 sensors is used in fuel control systems?
What characteristic of Tt2 sensors is used in fuel control systems?
What happens to the governor valve when the power lever is advanced?
What happens to the governor valve when the power lever is advanced?
What is the function of excess fuel in the hydro-pneumatic fuel control system?
What is the function of excess fuel in the hydro-pneumatic fuel control system?
How do the pressures Px and Py affect turbine temperatures under hot conditions?
How do the pressures Px and Py affect turbine temperatures under hot conditions?
What role do the flyweights play when the power lever is advanced?
What role do the flyweights play when the power lever is advanced?
Which input is NOT part of the hydro-pneumatic fuel control unit?
Which input is NOT part of the hydro-pneumatic fuel control unit?
What is the primary function of oil jets in a gas turbine engine?
What is the primary function of oil jets in a gas turbine engine?
How does an air-cooled oil cooler regulate the temperature of the oil?
How does an air-cooled oil cooler regulate the temperature of the oil?
What type of lubrication system is primarily used by oil jets under high pressure loads?
What type of lubrication system is primarily used by oil jets under high pressure loads?
Which component ensures that air is directed through an air-cooled oil cooler?
Which component ensures that air is directed through an air-cooled oil cooler?
Which statement about the oil jets' operation is correct?
Which statement about the oil jets' operation is correct?
In which scenario is an air/oil mist spray primarily utilized?
In which scenario is an air/oil mist spray primarily utilized?
What happens when the bypass valve of a fuel-cooled oil cooler is open?
What happens when the bypass valve of a fuel-cooled oil cooler is open?
What type of valve systems do air-cooled oil coolers use?
What type of valve systems do air-cooled oil coolers use?
What is the primary function of the combustor drain valve?
What is the primary function of the combustor drain valve?
What happens to the combustor drain valve during engine operation?
What happens to the combustor drain valve during engine operation?
How is the combustor drain valve opened after the engine is shut down?
How is the combustor drain valve opened after the engine is shut down?
What could occur if the combustor drain valve is not functioning properly?
What could occur if the combustor drain valve is not functioning properly?
What modern systems have been developed to manage dump fuel from the drain tank?
What modern systems have been developed to manage dump fuel from the drain tank?
What occurs when a drain tank becomes full in the described system?
What occurs when a drain tank becomes full in the described system?
Which method is currently prohibited for handling dump fuel?
Which method is currently prohibited for handling dump fuel?
What occurs to dump fuel when bleed air is introduced into the dump port?
What occurs to dump fuel when bleed air is introduced into the dump port?
What role does the governor play in engine operation?
What role does the governor play in engine operation?
How does the system manage changes in altitude?
How does the system manage changes in altitude?
What ensures smooth deceleration in the fuel system?
What ensures smooth deceleration in the fuel system?
What is the primary purpose of flow control units in fuel systems?
What is the primary purpose of flow control units in fuel systems?
What best describes the function of Electro‑Hydromechanical Control Systems?
What best describes the function of Electro‑Hydromechanical Control Systems?
What are the benefits of electronic engine control systems?
What are the benefits of electronic engine control systems?
Which type of electronic engine control system offers full authority over engine functions?
Which type of electronic engine control system offers full authority over engine functions?
What is the function of sensors in the fuel control system?
What is the function of sensors in the fuel control system?
Flashcards
Fuel-Cooled Oil Cooler
Fuel-Cooled Oil Cooler
Regulates oil flow with an open/closed bypass valve.
Air-Cooled Oil Coolers
Air-Cooled Oil Coolers
Use air for cooling; include bypass and thermostatic valves.
Oil Jets
Oil Jets
Distribute oil using calibrated orifices for lubrication.
Hydro-Pneumatic Fuel Control
Hydro-Pneumatic Fuel Control
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Tt2 Sensors
Tt2 Sensors
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Power Lever Position Dynamics
Power Lever Position Dynamics
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Hydro-Pneumatic vs. Hydromechanical
Hydro-Pneumatic vs. Hydromechanical
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Governor Section Mechanisms
Governor Section Mechanisms
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Electro-Hydromechanical Control
Electro-Hydromechanical Control
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Combustor Drain Valves
Combustor Drain Valves
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International Drain Tank Regulations
International Drain Tank Regulations
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Bypass Valve
Bypass Valve
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Thermostatic Valves
Thermostatic Valves
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Oil Spray Orifices
Oil Spray Orifices
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Direct-Lubrication Oil Jets
Direct-Lubrication Oil Jets
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Pneumatic System Control
Pneumatic System Control
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Flyweights and Bellows
Flyweights and Bellows
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Full Authority Digital Engine Control (FADEC)
Full Authority Digital Engine Control (FADEC)
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Automated Altitude Adjustment
Automated Altitude Adjustment
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Temperature Management
Temperature Management
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Mechanisms for Fuel Drainage
Mechanisms for Fuel Drainage
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Bleed Air Usage
Bleed Air Usage
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Oil Cooler Functions
Oil Cooler Functions
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Pneumatic Connections
Pneumatic Connections
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Engine Temperature Control
Engine Temperature Control
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Fuel Recycling Innovations
Fuel Recycling Innovations
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Study Notes
Fuel-Cooled Oil Cooler
- Functions with a bypass valve that can be open or closed to regulate oil flow.
Air-Cooled Oil Coolers
- Operate similarly to fuel-cooled oil coolers, using air to cool oil.
- Incorporate bypass and thermostatic valves for temperature regulation.
- Air scoop directs airflow through the cooler based on oil temperature.
Oil Jets
- Distribute oil for lubrication after it passes through the pressure pump and filter.
- Utilize calibrated orifices to create an oil spray or fluid stream.
- Direct-lubrication oil jets target bearings and gears; some engines use air/oil mist for wider lubrication coverage.
Hydro-Pneumatic Fuel Control
- Maintains proper air-fuel ratios using compressor discharge pressures.
- Controls RPM, acceleration, and flow rates via pneumatic and electronic systems.
- Employs unmetered fuel pressure from the fuel pump, regulated for constant flow.
Sensor Technology
- Tt2 sensors (bimetallic discs) monitor inlet duct temperature.
- Have a direct impact on fuel metering which influences turbine temperature management.
Power Lever Position Dynamics
- Advanced power levers affect governor valve operation, impacting RPM and fuel flow.
- Governing system uses flyweights and bellows to modulate metering valve openings for maintaining engine speed.
Differences in Fuel Control Types
- Hydro-pneumatic systems lack mechanical linkages, using pneumatic connections instead for more precise fuel flow control than hydromechanical systems.
Governor Section Mechanisms
- Responds to power lever inputs to regulate acceleration and maintain desired RPM.
- Incorporates automated altitude and temperature adjustment capabilities for effective performance under varying conditions.
Electro-Hydromechanical Control System
- Also known as electronic fuel controls due to predominance of electronic components.
- Aims at enhancing engine life, reliability, fuel efficiency, and reducing maintenance demands.
- Includes systems like Supervisory Electronic Engine Control and Full Authority Digital Engine Control (FADEC).
Combustor Drain Valves
- Mechanical valves that prevent fuel buildup in the combustion chamber during engine operation.
- Open upon pressure reduction after shutdown to allow safe fuel drainage, avoiding risks during subsequent starts.
Drain Tank Regulations
- International standards prevent direct dumping of fuel, mandating capture and recycling systems.
- Innovations include returning drained fuel to the aircraft's fuel supply or using bleed air to manage fuel dumping and prolong combustion before starvation.
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