PS51L LUBRICATION SYSTEM

Five functions of the oil in an engine lubrication system are:

1. Lubrication reduces friction. It acts like a cushion between metal parts. (Cushions)

2. Oil cooling (Absorbs heat)

3. Seal

4. The oil cleans the engine by picking up any wear and dust.

5. The oil prevents corrosion

2. The resistance of an oil to flow is known as its

viscosity

Oil that flows freely has a blank viscosity.

Low

The oil used in reciprocating engines has a relatively blank viscosity.

High

The measure of the change in viscosity of oil with a given change in temperature is known as the

Viscosity index

An engine lubricating oil whose viscosity changes very little for a given change in temperature has a blank viscosity

High viscosity

The point at which a liquid will begin to give off ignitable vapors is known as the blank point.

Flash point

Aviation 80 engine oil has the same viscosity as SAE

40

The use of straight mineral oil in aircraft reciprocating engines is associated with what conditions?

1. With new / overhauled engines

2. Older engines

The lubricating properties of straight mineral oil blank as good as those of ashless dispersant oil.

Are not

Synthetic lubricating oils are blank viscosity oils.

Multi-

If incompatible oil has been added to a turbine engine, it is often necessary to blank and blank the oil system before refilling with the proper oil.

Flush and refill

Turbine engine oils Blank use a standard identification system.

Do not

SAE numbers blank used to identify turbine oils.

Are not

Two types of lubricating systems for reciprocating aircraft engines are:

Wet sump

Dry sump

The lubrication is distributed to the parts of a reciprocating engine by these three methods:

Pressure

Splash

Spray

Splash/Pressure

The main disadvantages of a wet-sump engine are:

1. Sump size limits their oil capacity

2. They are harder to cool because the oil is contained in the hot engine

3. Oil temperature will be likely high then dry sump

What two markings must be on the oil filler cap?

Oil

Tank Capacity

Yellow cap

Oil tanks used on engines equipped with Hydromatic propellers will feed the pressure pump from a standpipe, leaving a reserve of oil for

Feathering propellers

A gear-type oil pump is a Blank displacement pump.

Constant

Constant-displacement oil pumps blank require a relief valve to control their output pressure.

Do

The two types of oil filter systems are:

The full flow system

By-pass system

In the blank filter system, only a portion of the oil is filtered each time it circulates.

By-pass

1. The most popular filter in common use for general aviation aircraft is the disposable blank filter

Semi-depth

1. The CUNO filter is a blank filtration type oil filter.

Edge-

The Blank valve determines which of the two possible paths the oil will take through a cooler.

Flow control

When the oil is cold, it flows blank the core of the oil cooler

Around

blank is a system installed on some reciprocating engines

to aid in cold weather starting by introducing fuel into the oil system prior to shutdown.

Oil dilution

Oil pressure is measured at the blank of the engine driven oil pump.

Outlet

The main contaminants found in used engine oil are:

Gasoline

Moisture

Acids

Dirt

Carbon

Metal particles

1. Oil coolers are normally removed and thoroughly cleaned and inspected at engine blank.

Engine Overhaul

1. The oil pressure on engines using an adjustable oil pressure relief may be increased by turning the adjustment screw blank

Clockwise

Oil consumption in turbine engines is blank than that in reciprocating

engines.

Lower

Most turbine engines use blank lubricating oil.

Synthetic

Most gas turbine engines for aircraft use a

Blank sump oil system.

Dry-

Turbine engine oil tanks must have an expansion space of blank or 0.5 gallon, whichever is greater.

10%

Two methods of determining the amount of oil in a dry-sump system oil tank are:

Sight gauge

Dip stick

Three types of oil pumps used with turbine engines are:

Vane

Gear

Gerotor

The gerotor pump is considered a blank displacement pump.

Positive

One micron =

.00039 inch

Three types of main system oil filters used with turbine engines are:

1. Disposable paper or fiber

2. Cleanable screen

3. Screen and disc type

Fine mesh screens called Blank filters strain the oil just before it is sprayed onto the bearing surface of a turbine engine

Last chance

Check valves in the oil supply lines prevent accumulations of oil in the Blank of the engine while the engine is not operating.

Accessory gearbox

The cockpit oil pressure gauge measures the pressure blank of the main oil filter.

Downstream

1. The location of the oil temperature sensor in a turbine engine blank make a significant difference in readings.

Does not

If the oil cooler is located in the pressure subsystem of a gas turbine engine, the engine uses a blank tank lubrication system.

Hot

Two types of oil coolers used with aircraft gas turbine engines are:

Fuel

Air

If turbine oil is observed to be dark brown or blackish with little or no contaminants present, it is probably caused by a chemical reaction to blank

Heat

Oil pressure adjustments on turbine engines are usually made while the engine is blank

Idling

1. The scavenge subsystem will have a blank capacity than the pressure subsystem

Greater

Magnetic chip detectors are usually found in the Blank subsystem of a gas turbine engine

Scavenge

1. The Electric Pulsed Chip Detector Blank discriminate between small wear particles and larger particles

Can