Podcast
Questions and Answers
What is measured by a fuel flowmeter in a continuous-fuel injection system?
What is measured by a fuel flowmeter in a continuous-fuel injection system?
Which instrument should be monitored to minimize the possibility of a 'hot' start in a gas turbine engine?
Which instrument should be monitored to minimize the possibility of a 'hot' start in a gas turbine engine?
Where are the hot and cold junctions located in an engine cylinder temperature indicating system?
Where are the hot and cold junctions located in an engine cylinder temperature indicating system?
How do motor driven impeller and turbine fuel flow transmitters transmit data?
How do motor driven impeller and turbine fuel flow transmitters transmit data?
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In what units are turbine engine tachometers calibrated?
In what units are turbine engine tachometers calibrated?
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What is directly affected by a change in engine manifold pressure?
What is directly affected by a change in engine manifold pressure?
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Under what conditions can cast iron piston rings be used?
Under what conditions can cast iron piston rings be used?
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What actuates the pilot valve in the governor of a constant-speed propeller?
What actuates the pilot valve in the governor of a constant-speed propeller?
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Why are some propeller hubs permanently sealed and partially filled with dyed oil?
Why are some propeller hubs permanently sealed and partially filled with dyed oil?
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What happens to the propeller when the engine is operating at speeds lower than those for which the constant-speed propeller control can govern in the INCREASE RPM position?
What happens to the propeller when the engine is operating at speeds lower than those for which the constant-speed propeller control can govern in the INCREASE RPM position?
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What is the primary purpose of the front and rear cones for propellers that are installed on splined shafts?
What is the primary purpose of the front and rear cones for propellers that are installed on splined shafts?
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What operational force tends to decrease propeller blade angle?
What operational force tends to decrease propeller blade angle?
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What is the primary function of the impeller and diffuser in a centrifugal compressor?
What is the primary function of the impeller and diffuser in a centrifugal compressor?
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What is a possible indicator of faulty igniter plugs in a turbojet engine?
What is a possible indicator of faulty igniter plugs in a turbojet engine?
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How does a dual axial-flow compressor improve the efficiency of a turbojet engine?
How does a dual axial-flow compressor improve the efficiency of a turbojet engine?
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What is a characteristic of subsonic air flowing through a convergent nozzle?
What is a characteristic of subsonic air flowing through a convergent nozzle?
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When starting a turbine engine, what is recommended when indication of light-off occurs?
When starting a turbine engine, what is recommended when indication of light-off occurs?
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How often are hot section inspections required for many modern turbine engines?
How often are hot section inspections required for many modern turbine engines?
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What is the likely effect on a compression check if the piston ring gaps are aligned?
What is the likely effect on a compression check if the piston ring gaps are aligned?
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What is engine operating flexibility?
What is engine operating flexibility?
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What is the function of turbine nozzle diaphragms in a gas turbine engine?
What is the function of turbine nozzle diaphragms in a gas turbine engine?
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If an engine misses in both the right and left positions of the magneto switch, what is the quickest method to locate the trouble?
If an engine misses in both the right and left positions of the magneto switch, what is the quickest method to locate the trouble?
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After spark plugs from an opposed engine have been serviced, in which position should they be reinstalled?
After spark plugs from an opposed engine have been serviced, in which position should they be reinstalled?
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What is the purpose of a cool-off period prior to shutdown of a turbine engine?
What is the purpose of a cool-off period prior to shutdown of a turbine engine?
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What is meant by a shrouded turbine?
What is meant by a shrouded turbine?
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What is the likely result of grinding the valves of a reciprocating engine to a feather edge?
What is the likely result of grinding the valves of a reciprocating engine to a feather edge?
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What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?
What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?
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Which of the following conditions can cause an engine to have an increased tendency to detonate?
Which of the following conditions can cause an engine to have an increased tendency to detonate?
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In a turbine engine with a dual-spool compressor, how does the low speed compressor operate?
In a turbine engine with a dual-spool compressor, how does the low speed compressor operate?
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What is directed into the first stage rotor vanes at the proper angle in a turbine engine?
What is directed into the first stage rotor vanes at the proper angle in a turbine engine?
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Study Notes
Fuel Flow Measurement
- Fuel flowmeters measure fuel flow volume, fuel pressure, and fuel flow mass in continuous-fuel injection systems.
- Fuel pressure drop is measured across the metering valve, not the manifold valve or fuel nozzles.
Turbine Engine Instruments
- Monitor turbine inlet temperature to minimize the possibility of a “hot” start.
- Motor-driven impeller and turbine fuel flow transmitters transmit data mechanically, not using aircraft electrical system power or fuel pressure.
- Tachometers are calibrated in percent of engine RPM, not actual engine RPM or percent of engine pressure ratio.
Reciprocating Engines
- In a conventional reciprocating engine, the fuel/air mixture is ignited shortly before the piston reaches the top of the compression stroke.
- Cast iron piston rings may be used in chrome-plated cylinders, and chrome-plated rings may be used in plain steel cylinders.
Propellers
- The pilot valve in the governor of a constant-speed propeller is actuated by governor flyweights, not engine oil pressure or governor pump oil pressure.
- Permanently sealing and partially filling some propeller hubs with dyed oil helps to dampen pressure surges and prevent too rapid changes in propeller blade angle.
- During engine operation at speeds lower than those for which the constant-speed propeller control can govern in the INCREASE RPM position, the propeller will remain in the full LOW PITCH position.
Turbojet Engine
- The velocity of subsonic air as it flows through a convergent nozzle increases.
- A hot start is indicated if the exhaust gas temperature exceeds specified limits during turbine engine start-up.
- Hot section inspections for many modern turbine engines are required on a time or cycle basis, not only at engine overhaul or when an over temperature or over speed has occurred.
Centrifugal Compressor
- The two functional elements in a centrifugal compressor are the impeller and diffuser, not turbine and compressor or bucket and expander.
Turbine Engine Maintenance
- Hot spots in the combustion section of a turbojet engine may indicate faulty igniter plugs, dirty compressor blades, or malfunctioning fuel nozzles.
- A dual axial-flow compressor improves the efficiency of a turbojet engine by increasing the velocity of the air entering the combustion chamber.
Engine Performance
- Engine operating flexibility refers to the ability of the engine to run smoothly and give the desired performance at all speeds, not to deliver maximum horsepower at a specific altitude or meet exacting requirements of efficiency and low weight per horsepower ratio.
Reciprocating Engine Maintenance
- If piston ring gaps happen to be aligned during a differential pressure compression check on a cylinder, the test results may indicate a worn or defective ring(s).
- Grinding the valves of a reciprocating engine to a feather edge can result in excessive valve clearance, pre-ignition, and burned valves.
Engine Operation
- Conditions that increase an engine’s tendency to detonate include high manifold pressure, high intake air temperature, and late ignition timing.
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Description
Test your knowledge of aircraft engines, including fuel systems, injection systems, and turbine engine operation. Covers key components, measurements, and safety considerations.
