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Questions and Answers
What should be done to a pressurized turbine engine oil tank after making a welded repair?
What should be done to a pressurized turbine engine oil tank after making a welded repair?
- Pressure check to the manufacturer's recommended pressure
- Pressure check to not less than 5 PSI plus the maximum operating pressure of the tank (correct)
- Pressure check to 5 PSI
- Pressure check to not less than 5 PSI plus the average operating pressure of the tank
How do ferrous metal particles in turbine engine oil cause an indicating type magnetic chip detector to indicate their presence?
How do ferrous metal particles in turbine engine oil cause an indicating type magnetic chip detector to indicate their presence?
- By changing the magnetic field strength
- By generating a small electric current
- By bridging the gap between the detector center and ground electrode (correct)
- By disturbing the magnetic lines of flux around the detector tip
What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?
What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?
- Increased oil flow rate
- Increased oil pressure
- Increased engine performance
- Decreased oil temperature (correct)
What is the primary purpose of the oil to fuel heat exchanger?
What is the primary purpose of the oil to fuel heat exchanger?
What is the primary purpose of the oil breather pressurization system?
What is the primary purpose of the oil breather pressurization system?
What type of oil system is usually found on turbine engines?
What type of oil system is usually found on turbine engines?
How are the teeth of the gears in the accessory section of an engine normally lubricated?
How are the teeth of the gears in the accessory section of an engine normally lubricated?
Why do manufacturers require turbine engine oil servicing within a short time after engine shutdown?
Why do manufacturers require turbine engine oil servicing within a short time after engine shutdown?
What type of valve is used to relieve excessive pump pressure in an engine's internal oil system?
What type of valve is used to relieve excessive pump pressure in an engine's internal oil system?
What type of oil pumps are most commonly used on turbine engines?
What type of oil pumps are most commonly used on turbine engines?
What is the function of a scavenge filter in a gas turbine lubrication system?
What is the function of a scavenge filter in a gas turbine lubrication system?
How does a gear type oil pump operate?
How does a gear type oil pump operate?
What is the typical relationship between oil pressure and fuel pressure in a turbine engine?
What is the typical relationship between oil pressure and fuel pressure in a turbine engine?
What is the source of the working fluid in a constant speed drive (CSD)?
What is the source of the working fluid in a constant speed drive (CSD)?
Which of the following is a potential cause of high oil temperature in a turbine engine, with no change in power setting parameters?
Which of the following is a potential cause of high oil temperature in a turbine engine, with no change in power setting parameters?
How is engine oil typically cooled in a turbine engine?
How is engine oil typically cooled in a turbine engine?
What is the purpose of the oil pressure spray jets in a turbine engine?
What is the purpose of the oil pressure spray jets in a turbine engine?
What type of filters are typically used to protect oil pressure spray jets?
What type of filters are typically used to protect oil pressure spray jets?
What type of filter serves as a last chance filter in a turbine engine?
What type of filter serves as a last chance filter in a turbine engine?
How does a gyroter type oil pump work?
How does a gyroter type oil pump work?
What is the function of the oil dampened main bearing used in some turbine engines?
What is the function of the oil dampened main bearing used in some turbine engines?
What component in the oil system acts as a chip detector?
What component in the oil system acts as a chip detector?
What is the purpose of the last chance oil filters?
What is the purpose of the last chance oil filters?
What happens to the return oil if the oil line between the scavenger pump and the oil cooler separates?
What happens to the return oil if the oil line between the scavenger pump and the oil cooler separates?
Which turbine engine component is responsible for generating the most heat that is absorbed by the oil?
Which turbine engine component is responsible for generating the most heat that is absorbed by the oil?
What is the purpose of the fuel oil heat exchanger in a jet engine?
What is the purpose of the fuel oil heat exchanger in a jet engine?
What happens to the oil flow in a gear type engine oil pump at cruise RPM?
What happens to the oil flow in a gear type engine oil pump at cruise RPM?
What is the purpose of the thermostatic valve in a fuel oil heat exchanger?
What is the purpose of the thermostatic valve in a fuel oil heat exchanger?
What component protects an oil cooler from damage if the oil inside becomes solidified?
What component protects an oil cooler from damage if the oil inside becomes solidified?
If an oil filter becomes completely blocked, what happens to the oil flow to the engine?
If an oil filter becomes completely blocked, what happens to the oil flow to the engine?
Which of the following is NOT a subsystem of a typical self-contained, high-pressure dry sump lubrication system?
Which of the following is NOT a subsystem of a typical self-contained, high-pressure dry sump lubrication system?
What is the primary function of the hopper in the oil supply tank of some dry sump engine installations?
What is the primary function of the hopper in the oil supply tank of some dry sump engine installations?
What determines the minimum particle size that a Cuno-type oil filter can exclude?
What determines the minimum particle size that a Cuno-type oil filter can exclude?
In a full-flow oil lubrication system, what characterizes the oil pressure?
In a full-flow oil lubrication system, what characterizes the oil pressure?
How should a felt filter in an oil lubrication system be handled when it needs to be cleaned?
How should a felt filter in an oil lubrication system be handled when it needs to be cleaned?
What type of filter is typically found on the inlet side of an oil scavenge pump?
What type of filter is typically found on the inlet side of an oil scavenge pump?
How is the output of a vane-type oil pump controlled?
How is the output of a vane-type oil pump controlled?
What is the primary function of the sump in a dry sump oil system?
What is the primary function of the sump in a dry sump oil system?
What is the purpose of an anti-surge valve in an air-cooled oil cooler?
What is the purpose of an anti-surge valve in an air-cooled oil cooler?
What feature characterizes a thread type oil seal in a lubrication system?
What feature characterizes a thread type oil seal in a lubrication system?
Which type of oil system is primarily used in most modern turboprop engines?
Which type of oil system is primarily used in most modern turboprop engines?
What flow and pressure characteristics does a spur gear pump exhibit in a lubrication system?
What flow and pressure characteristics does a spur gear pump exhibit in a lubrication system?
During which maintenance activity are 'last chance' filters in a lubrication system serviced?
During which maintenance activity are 'last chance' filters in a lubrication system serviced?
What follows the word 'lubrication' on a lubrication fluid line for identification purposes?
What follows the word 'lubrication' on a lubrication fluid line for identification purposes?
Which of the following statements regarding oil pressure relief bypass valves is accurate?
Which of the following statements regarding oil pressure relief bypass valves is accurate?
What is the primary role of centrifugal force in the context of impeller function?
What is the primary role of centrifugal force in the context of impeller function?
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Study Notes
Lubrication Systems
Oil Pressure and Flow
- Oil pressure in the cooler is higher than fuel pressure.
- Gear type oil pump draws oil into the pump and carries it round between the gear teeth and casing.
- Scavenge filter is incorporated in a gas turbine lubrication system to protect the pressure pump.
Engine Oil Cooling and Filtering
- Engine oil is usually cooled by a fuel/oil cooler.
- In-line thread filters are used to protect oil pressure spray jets.
- Micronic filters are used in some systems.
Oil Pumps and Systems
- Gear type oil pumps and gyroter type oil pumps operate similarly, drawing oil into the pump and carrying it round between the gear teeth and casing.
- A constant speed drive (CSD) has its own self-contained oil system.
- A dry sump lubrication system has a pressure, breather, and scavenge subsystems.
Oil Pressure Relief and Control
- The chip detector in the oil system is a magnetic plug in the return line.
- The last chance oil filters are used to prevent damage to the oil spray nozzle.
- Oil pressure relief valves are used to prevent over-pressurization of the system.
- High oil pressure should be limited to the engine manufacturer's recommendations.
Oil Systems and Components
- A dry sump lubrication system stores oil in a separate tank.
- The hopper in the oil supply tank reduces the time required to warm the oil to operating temperatures.
- Wire mesh filters are used in oil scavenge pumps.
- Turbo-prop engines typically use dry sump type lubrication systems.
Oil Leaks and Contamination
- A blocked oil filter will allow oil to flow at a normal rate through the system.
- Oil leaks can be detrimental to internal engine components.
- Ferrous metal particles in turbine engine oil can cause an electrical indicating type magnetic chip detector to indicate their presence.
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