Lubrication system

Question 1

What is Straight mineral oil

Answer 1

Natural lubricating oil that has no additives for foaming, cleaning, or viscosity

Question 2

What is ashless Dispersant oil

Answer 2

Mineral oil with additives that evenly spread contaminants through the oil. The additives that are used to not form Ashes

Question 3

What is synthetic oil

Answer 3

Oil that is man-made through the process of chemically altering the Molecular structure of petroleum oil in order to achieve the desired characteristics

Question 4

What is meant by multiviscosity oil

Answer 4

It is an oil that has varying viscosity

When it oil is cold, it will have low viscosity, but when it is warms up, the viscosity will increase for a better lubrication. For example 5W 30 has a viscosity index of five when it is cold but 30 when it is warm

Question 5

What are the purposes of reciprocating engine oil

Answer 5

It cleans, Cools , cushions, seals, and lubricates parts

Question 6

What is the most important property that aircraft reciprocating engine oil must possess

Answer 6

Viscosity

Question 7

What factors must be considered in determining the proper grade of oil to use in a specific engine

Answer 7

Operating load, rotational speeds, and operating temperatures are the most important factors to be considered

Question 8

What is the purpose of the oil flow control valve” Oil cooler bypass valve”

Answer 8

When the oil is cool the valve will direct it around the oil cooler. When the oil is warm it will be directed through the oil cooler

Question 9

What is the main oil contaminants

Answer 9

Gasoline, moisture, acid, dirt, Corbin, and metallic particles

Question 10

From what location on a reciprocating engine is the oil temperature usually taken

Answer 10

In either system,The bulb is located where it measures oil temperature before it enters the hot section of the engine

In a dry simplification system the oil temperature bulb is located anywhere in the oil inlet line between the oil tank and the engine. Wet some systems have the temperature ball located where his senses the temperature after the oil passes through the oil cooler

Question 11

What do metallic particles on oil screen indicated

Answer 11

Metallic particles may be an indication of internal failure of the engine

Question 12

What could cause oil foaming

Answer 12

Caused by diluted oil, contaminated oil, or the oil level is too high

Question 13

What would be an indication of blocked oil cooler passages

Answer 13

High oil temp

Question 14

What would be an indication of an in adequate oil supply

Answer 14

Low oil pressure and high oil temperatures

Question 15

What type of oil is used in turbine engine lubrication systems

Answer 15

Specially developed synthetic oil’s

Question 16

Where can you find the specified grade of oil for a particular Aircraft

Answer 16

Oil grade can be found in an airplane flight manual or pilots operating handbook

Question 17

What are two types of oil coolers used in turbine engine lubrication systems

Answer 17

Air cooled oil cooler and fuel cooled oil cooler

Question 18

What is the meaning of oil flashpoint, fire point

Answer 18

The temperature at which the oil will begin to give off ignitable vapors.

Question 19

What is the weight of aircraft engine oil

Answer 19

7.5 pounds per US gallon

Question 20

What is the purpose of an oil dilution system

Answer 20

Change the oil by introducing fuel into the lubrication system which makes cold weather starting easier.

Fuel is used because it will evaporate out of the oil and leave through the crank case breather

Question 21

What is the primary purpose of engine oil lubricant

Answer 21

To reduce friction

Question 22

What is the S.O.A.P analysis

Answer 22

Is an oil analysis system that establishes a trend to measure engine health. One test does not do much unless something is very wrong

Question 23

Where are carbon seals used in turbine engine’s

Answer 23

Carbon seals are used an aircraft gearboxes, air turban motor starters, and main shaft seals

Question 24

What is the key purpose of lubrication in a turbine engine

Answer 24

Lubrication of the main shaft bearing

Question 25

Where are engine oil filters located

Answer 25

oil pump output and the engine bearings

Question 26

Why do reciprocating engines require oil with high viscosity index

Answer 26

High Viscosity indexes allow for easier starting in cold temperatures and prevent the oil from becoming too thin and operating temperatures to protect the bearings under operating loads

Question 27

Why do reciprocating engines require high viscosity oil

Answer 27

Viscosity oil performs better and reciprocating engines because they have large clearances, high operating temperatures, and high bearing pressure

Question 28

What two factors impact fluid viscosity

Answer 28

Temperature and pressure, although pressure has a very small affect on viscosity