Engine Lubrication System Flashcards
Name one type of oil filter used on aircraft engine
Screen cuno and canister or spin on
What is straight mineral oil?
Natural lubricating oil has no additives
What is ashless dispersant oil?
mineral oil with additive that evenly spread the contaminants throughout the oil. The additive used does not form Ash.
What is synthetic oil?
Man made through the process of chemically altering the molecular structure of petroleum oil to achieve desired characteristics
What is meant by multi viscosity oil
Oil has varying viscosity. When the oil is cold it will have low viscosity . When it warms up the viscosity increase for better lubrication
What are the main purpose of reciprocating engine oil?
Cleans,cools,cushions, seals, and lubricate parts
What is the most important property that aircraft reciprocating engine oil must possess
viscosity
What factor must be considered in determining the proper grade of oil used in specific engine
Operating load, rotational speed, and operating temperature
What is the purpose of oil flow control valve? “ oil bypass valve “
To direct the oil around the cooler when the oil is cold, and in through the oil cooler when is warm
What are some oil contaminant?
Gasoline, moisture, acid, dirt, carbon, and metallic particle
From what location on a reciprocating engine is the oil temperature usually taken
It’s located where it measure the oil temperature before it enter at the hot section. in the dry sump temperature bolt is located anywhere in the oil inlet line between the oil tank and the engine. Wet sump the bulb is located where is senses the temperature after the oil passes through the oil cooler
What do metallic particle on an oil screen indicate
Indication of internal failure of the engine
what could cause oil foaming?
Caused by diluted oil, contaminate oil, or the oil level is too high
What would be an indication of blocked oil cooler passage?
High oil temperature
What will be the indication of inadequate oil supply?
 Low oil pressure and high oil temperature
What type of oil is used in turbine engine lubrication system?
Synthetic oil
Where can you find a specified grade a oil for particular aircraft
Flight manual, highlights, operating handbook
What are the two types of oil cooler used in the turbine engine lubrication system?
air cooled oil cooler and fuel cool oil cooler
What’s the meaning of oil flashpoint and fire point
Flashpoint is the temperature at which oil gives off ignitable vapors. Firepoint is the temperature at which there are sufficient vapors to support continuous flame.
What is the weight of the aircraft engine oil?
About 7.5 pounds per gallon.
What is the purpose of oil dilution system?
Thins the oil by introducing fuel into the lubrication system, which makes cold starting easier
What is the main purpose of engine oil lubricant
To reduce friction
What is the S.O.A.P
Spectrometric oil analysis program that establish trend that measures engine Health
Where are carbon seal used in turbine engine
Aircraft gearbox, air turbine motor starter and main shaft seal
What is the key purpose of lubrication in a turbine engine?
Location of the main shaft bearing
Where are engine oil filter located?
 Between the oil pump output and the engine bearings
Why do reciprocating engine require oil with high viscosity index?
High viscosity index, allow for easy, starting in cold temperature and prevents oil for becoming too thin at operate temperature to protect the bearing under load
What two factors impact fluid viscosity
Temperature and pressure auto pressure has very small affect
What is the purpose of ashless dispersion oil?
To prevent sludge, buildup and oil filters from clogging
What is the most critical lubrication points in a gas turbine engine?
Turbine bearing
Why is an oil tank required to have expansion space
Thermal expansion and air in the return oil?
Name some areas of turbine engine oil system where screens/filters might be located
Oil pressure system, scavenge system, at or just before the oil jet
