Powerplant: G - Lubrication Systems

Front 1

What is meant by the viscosity of engine lubricating oil?

Back 1

the oils resistance to flow

Front 2

What is meant by a wet sump lubrication system?

Back 2

lubrication system in which the oil is carried inside the engine itself.

Front 3

What is meant by a dry sump lubrication system?

Back 3

lubrication system in which the oil is carried in a tank that is not a part of the engine.

Front 4

How is oil temperature controlled in an aircraft reciprocating engine?

Back 4

Oil is either directed through or around the oil cooler core to maintain temp.

Front 5

Is the oil temperature shown on the aircraft instrument panel the temperature of the oil entering the engine or of the oil leaving the engine?

Back 5

temperature of oil entering the engine.

Front 6

What is the purpose of oil dilution in a reciprocating engine?

Back 6

When very cold weather is anticipated, gasoline can be mixed with the lubricating oil before the engine is shut down. This reduces the viscosity of the oil and makes starting easier.

Front 7

What is the function of the hopper in the oil tanks used with some reciprocating engines?

Back 7

Hoppers are a part of the oil dilution system. Only the oil in the hopper is diluted.

Front 8

What happens to the gasoline that is used to dilute the oil in the crankcase of an aircraft reciprocating engine?

Back 8

When the engine is running and the oil is warm, the gasoline evaporates out of it.

Front 9

What is the purpose of the sludge plugs in the crankshaft of a reciprocating engine?

Back 9

They trap sludge that is in the oil and hold it until the engine is disassembled at overhaul.

Front 10

Which pump is the larger in a dry–sump lubricating system, the pressure pump or the scavenger pump?

Back 10

The scavenger pump is bigger

Front 11

Why do full–flow oil filters have a spring–operated bypass valve in them?

Back 11

In case the filter should plug up so it cannot pass any oil, the bypass valve will open and allow unfiltered oil to flow through the system.

Front 12

What is the function of a fuel–oil heat exchanger in the lubrication system of a turbojet engine?

Back 12

This allows heat from the oil to warm the fuel

Front 13

What kind of oil is used in most turbojet engines?

Back 13

Synthetic oil.

Front 14

Where are the last chance oil filters located in a turbojet engine?

Back 14

located just ahead of the nozzles that spray oil onto the bearings.

Front 15

Where is the oil tank in a dry–sump reciprocating engine vented?

Back 15

at the engine crankcase.

Front 16

What information must be displayed around the oil filler opening for a turbojet engine?

Back 16

The word "Oil" and the permissible oil designations, or references to the Airplane Flight Manual

Front 17

What is the function of the oil control rings on the piston of an aircraft reciprocating engine?

Back 17

They maintain the proper quantity of oil between the piston and the cylinder wall.

Front 18

What is meant by a spectrometric oil analysis?

Back 18

It is a program in which a sample of oil is taken from the engine at regular intervals and sent to a laboratory. A single sample is meaningless. There must be a series of samples taken at regular intervals to measure the change in the amounts of these metals.

Front 19

What indication would a pilot have if his oil supply was low?

Back 19

The oil temperature would be high and the oil pressure would be low.

Front 20

What is meant by a hot–tank lubrication system?

Back 20

A system in which the oil cooler is located in the pressure subsystem.

Front 21

What is meant by a cold–tank lubrication system?

Back 21

A system in which the oil cooler is located in the scavenge subsystem.

Front 22

What is straight mineral oil?

Back 22

A distillation of crude oil with no additives

Hint 22

Crude oil: no adds

Front 23

What is ashless dispersant (AD) oil?

Back 23

A mineral oil containing additives that disperse the contaminants throughout the oil so they will not clog oil passages.

Hint 23

Mineral oil: adds to prevent clogging: no ash forming additives

Front 24

What is synthetic oil?

Back 24

Oil that is made by chemically changing the nature of an oil base to give it the needed characteristics.

Hint 24

Chemically: base: needed characteristics

Front 25

Is automotive oil suitable for use in aircraft?

Back 25

No, automotive and aviation oils are formulated entirely different

Front 26

What is meant by a multiviscosity oil?

Back 26

Oil that increases in viscosity when it is hot and decreases viscosity when cold

Hint 26

Viscosity index improver

Front 27

What are six functions of the oil in an engine?

Back 27

Reduces friction
Seals and cushions
Removes heat
Cleans inside the engine
Protects against corrosion
Performs hydraulic action

Hint 27

S.c.r.r.p.p

Front 28

Where can you find the grade of engine oil specified for a particular aircraft?

Back 28

Aircraft Flight Manual or the Pilots Operating Handbook for the aircraft

Front 29

What components in a reciprocating–engine lube system must be inspected on a 100 hr or annual?

Back 29

Oil tank

oil strainer

oil filter

oil cooler

oil pressure and temp gages

entire engine for oil leaks

Front 30

What two instruments show the condition of a reciprocating–engine lube system?

Back 30

Oil pressure gage

Oil temp gage

Front 31

What must be done to an oil filter when it is removed from the engine?

Back 31

Cut open the filter element and examine to see the type and amount of contaminants

Front 32

What is the purpose of an air–oil separator, or deaerator, in a turbine engine oil tank?

Back 32

In normal operation, the oil picks some air and is swirled in the deaerator. The swirling action releases the air from the oil, and the air is used to pressurize the oil tank

Front 33

What type of oil quantity indicator is used in most aircraft engines?

Back 33

A dipstick that measures the quantity of oil in the tank or sump

Front 34

When should the engine oil quantity be checked on a turbine?

Back 34

As soon as practical after the engine is shut down

Front 35

Where is the oil temp measured on a recip engine?

Back 35

At the Pressure screen before the oil goes into the engine

Front 36

How is oil pressure regulated in an engine?

Back 36

A Pressure–relief valve set to the desired pressure sends all of the oil that caused excessive pressure back into the engine tank

Front 37

Why do engine manufactures recommend that engine lube oil be changed at specific intervals?

Back 37

Oil picks up contaminants and carries them through the engine where they can cause wear.

The oil becomes acidic and causes corrosion

Hint 37

Contaminants/acidic

Front 38

What is the purpose of the restricted orifice in the line between the oil pressure gage and the engine?

Back 38

Helps dampen pulsations in oil pressure caused by the pump