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M15 > 15.10 Lubrication Systems > Flashcards

15.10 Lubrication Systems Flashcards

1
Q

What is the purpose of lubrication systems?

A

To distribute oil to bearing compartments and gearboxes.

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2
Q

What are the 2 types of lubrication sumps used?

A

Wet and dry sumps.

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3
Q

Where does a wet sump store oil?

A

In the engine.

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4
Q

Where does a dry sump store oil?

A

An external supply tank mounted on/near the engine.

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5
Q

What are the 2 classifications of lubrication systems?

A

Full flow.
Constant pressure.

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6
Q

What can be said about oil pressure in a full flow system?

A

It can’t be regulated.

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7
Q

What changes oil pressure in a full flow system?

A

Rotor speed and oil temp.

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8
Q

What drives the supply pump in a full flow system?

A

N2 rotor

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9
Q

What effect does a leakage have on oil pressure?

A

Decreases it.

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10
Q

Where is a pressure relief valve installed in a full flow system?

A

Between the delivery and suction side of the supply pump.

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11
Q

What can be said about the oil pressure of a constant pressure system?

A

It is regulated.

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12
Q

What valve does the constant pressure system have that the full flow system doesn’t?

A

Pressure regulating valve.

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13
Q

What effect do changes in oil temp have on oil pressure?

A

No effect.

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14
Q

What lubrication system is most common?

A

Full flow.

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15
Q

What are the advantages of a full flow system?

A

Simplicity.
No adjustments are necessary during maintenance.

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16
Q

What are the negatives of a full flow system?

A

Needs relatively high oil pressure when engine is at idle.
There’s a rise in oil temp after a power reduction.

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17
Q

What is the critical point of the lubrication system due to high temperatures.

A

Exhaust turbine bearing.

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18
Q

What is used to cool oil?

A

An oil cooler.

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19
Q

What is an oil tank made of?

A

Aluminium coated in silicone for fire resistance.

20
Q

What surrounds a filler to catch oil spillage during servicing?

A

A scupper.

21
Q

Where does a scupper drain spilt oil?

A

To the engine drain mast.

22
Q

What is a strainer?

A

A filter

23
Q

What is an oil pump designed to do?

A

To supply oil under pressure.

24
Q

What are the 2 types of oil pumps?

A

Gear and gerotor.

25
Q

How many elements can a gear oil pump have?

A

Only 2 elements: one for pressure oil and one for scavenging.

26
Q

How many elements can a gerotor oil pump have?

A

1 for pressure oil and several elements for scavenging oil.

27
Q

What is the benefit of a gerotor oil pump?

A

Capacity of elements can be controlled by varying the size of the elements.

28
Q

Where is the oil pressure regulating valve located?

A

On the pressure side of the pump.

29
Q

When is the pressure relief valve especially important?

A

When oil coolers are in the system.

30
Q

Where are oil filters installed?

A

Upstream of oil nozzles.
Filters known as last chance filters.

31
Q

When heat exchangers installed in the supply line what are they known as ?

A

Hot tank system

32
Q

When heat exchangers are installed in the scavenger line, what are they known as?

A

Cold tank system

33
Q

What are the 2 types of oil coolers?

A

Fuel cooled and air cooled.

34
Q

What is oil scavenging?

A

Returning oil to the oil tank.

35
Q

What does a de-arotor do?

A

Separates air from scavenging oil.
Air is vented overboard.

36
Q

What is the purpose of a breather?

A

System venting.

37
Q

What re the 2 types of monitoring transmitters?

A

Capacitance type.
Reed switching type.

38
Q

What measures oil capacity in a capacitance type transmitter?

A

Electronic components in the upper part.

39
Q

Describe a reed tube type transmitter?

A

A metal tube with a float and a multi switch assembly.

40
Q

What is used to catch metal debris particles?

A

Magnetic chip detectors.

41
Q

How are magnetic chip detectors checked?

A

Manually or electronically monitored.

42
Q

How does a magnetic chip detector work?

A

Resistance drops when particles connect with magnets.

43
Q

What is Spectrometric Oil Analysis Program (SOAP) used for?

A

To find out about internal wear.

44
Q

What can SOAP do?

A

Find particles that cannot be caught by oil filters.

45
Q

How is oil quantity checked?

A

On sight gauge or ECAM.

M15 (18 decks)

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