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16 Cards in this Set
- Front
- Back
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What is the primary purpose of lubricant in an aircraft engine? |
To reduce friction between moving parts |
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What is the most important property that aircraft reciprocating engine oil must possess? |
Viscosity |
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What factors must be considered in determining the proper grade of oil to use in a specific engine |
Operating load, rotational speeds and operating temperatures are the most important factors to be considered |
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What is the purpose of the oil flow control valve? |
Located on the oil cooler, regulates the flow of the oil either into or around the oil cooler |
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What are the main oil contaminants? |
Gasoline, moisture, acids, dirt, carbon, and metallic particles |
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From what location on a reciprocating engine is the oil temperature usually taken? |
Dry sump: anywhere in the oil inlet line between the oil tank and the engine Wet sump: located where it senses the temperature after the oil passes through the the oil cooler |
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What do metallic particles on an oil screen indicate? |
Metallic particles may be an indication of internal failure of the engine. |
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What can cause oil foaming? |
Foaming can be cause by diluted oil, contaminated oil or the oil level to high |
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What would be an indication of blocked oil cooler passages? |
High oil temperature |
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What would be an indication of an inadequate oil supply? |
Low oil pressure and high oil pressure |
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What type of oil is used in turbine engine lubrication systems? |
Specially developed synthetic oil |
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What are two types of oil coolers used in turbine engine lubrication systems? |
The air cooled oil cooler and the fuel cooled oil cooler are the two basic types in general use |
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What is the meaning of oil Flash point? Fire point? |
Oil flash point is that temperature at which the oil will begin to give off ignitable vapors. The fire point is that temperature at which there are sufficient vapors to support a flame. |
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What are the functions of the engine oil in a reciprocating engine in addition to lubricating the engine? |
Oil cools various parts of the engine, helps seal the combustion chamber by providing a film between the cylinder walls and the rings. Also, aids in cleaning the engine by carrying engine residues to the oil filter. |
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What is the weight of aircraft engine oil? |
7.2 pounds per gallon |
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What is the purpose of an oil dilution system? |
To thin the oil by the introduction of fuel into the lubrication system for cold weather starting |
