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CAA Module 15 > Module 15.10 Lubrication Systems > Flashcards

Module 15.10 Lubrication Systems Flashcards

1
Q

What does the lubrication system do?

A

Distributes oil to the engine bearing compartments and the gearboxes.

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2
Q

What is a wet sump engine lubrication system?

A

A system that stores the oil in the engine?

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3
Q

What is a dry sump engine lubrication system?

A

A system that uses an external supply tank.

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4
Q

What are the two classifications of oil/lubrication systems?

A

Full-flow system
Constant pressure system

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5
Q

What is a full-flow lubrication system?

A

A system that has no way of regulating the oil pressure.

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6
Q

How does oil pressure change in the full-flow system?

A

It changes with changes in rotor speed (N2), oil temperature, and the flow areas downstream of the supply pump.

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7
Q

What is the supply pump driven by in a full-flow system?

A

The N2 rotor system via the gearbox.

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8
Q

What happens at higher N2 rotor speeds?

A

The supply pump produces a higher flow of oil (higher pressure).

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9
Q

What does higher oil temp do to the oil?

A

Lowers its viscosity.

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10
Q

What does low viscosity oil give?

A

Lower flow resistance and oil pressure.

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11
Q

A decrease in oil temp leads to what?

A

Higher oil pressure.

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12
Q

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

A

Between the delivery side and the suction side of the supply pump.

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13
Q

What type of valve does a constant pressure system need?

A

A pressure regulating valve.

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14
Q

What does the pressure relief valve in a constant pressure system do?

A

Holds the oil pressure to at the same value for all N2 rotor speeds.

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15
Q

In a constant pressure system, does oil temperature effect oil pressure?

A

No

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16
Q

Which lubrication/oil system is most commonly used?

A

Full-flow system.

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17
Q

What does the pressure relief valve do in a full-flow system?

A

Prevent oil pressure from becoming too high.

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18
Q

What is the main disadvantage of a full flow system?

A

A significant rise in oil temperature after a power reduction.

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19
Q

Name a critical lubrication point in the turbine?

A

Exhaust turbine bearing.

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20
Q

What can be used to cool the exhaust turbine bearing?

A

Air cooling and oil cooling.

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21
Q

Where is air cooling to the exhaust bearing turbine supplied from?

A

The early stages of the compressor.

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22
Q

What is the benefit of air cooling?

A

Reduces the amount of oil needed to provide cooling of the bearings.

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23
Q

What does lubricating oil for bearing cooling normally require?

A

An oil cooler.

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24
Q

What are the four lubrication subsystems?

A

Oil reservoir and supply system
Scavenge system
Vent system
Monitoring system

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25
Q

What two ways are used to fill the oil storage tank?

A

Gravity
Pressure

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26
Q

What is the filler on the storage tank surrounded by?

A

A scupper?

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27
Q

What does the scupper on the storage tank do?

A

Catches any oil spilled during servicing and drains it to the engine drain mast.

28
Q

Where is the strainer and check valve in the storage tank located?

A

Below the filler cap.

29
Q

What does the check valve do?

A

Prevents the discharge of air and oil through the filler when the cap is not correctly fitted.

30
Q

How can oil samples be taken from the tank?

A

Via a sampling tube in the strainer.

31
Q

What is used to check oil quantity in the storage tank?

A

A sight glass.

32
Q

Where does oil flow to from the tank?

A

Oil pump and pressure filter housing.

33
Q

Where does oil flow to after the pressure oil filter?

A

Through the air oil heat exchanger and the fuel-cooled oil cooler.

34
Q

What is the primary source of oil cooling?

A

Fuel-cooled oil cooler

35
Q

How does a fuel-cooled oil cooler work?

A

The oil cools as it heats the fuel.

36
Q

When the the air oil heat exchanger operate?

A

When additional oil cooling is required.

37
Q

What two elements do oil pumps consist of?

A

Pressure supply element and scavenge elements.

38
Q

What can be used as a bypass valve?

A

An oil cooler.

39
Q

What do screens in the suction lines do?

A

Protect the oil pumps.

40
Q

Where are screens in the supply line installed?

A

Upstream of the oil nozzles.

41
Q

What do screens in the supply line do?

A

Protect the oil nozzles if the supply filter is bypassed.

42
Q

Where can the oil cooler be located?

A

In the supply line downstream of the supply pump or in the scavenge line.

43
Q

What is a hot tank oil cooler system?

A

The oil cooler is installed in the supply line. Oil from the bearing compartments is not cooled before it returns to the oil tank.

44
Q

What is a cold tank oil cooler system?

A

The oil cooler is installed in the scavenge line the system. The oil from the bearing compartments is cooled before it returns to the oil tank.

45
Q

What are the two main types of oil coolers?

A

Fuel-cooled
Air-cooled

46
Q

What type of oil cooler do most large jet engine use?

A

Fuel-cooled oil coolers.

47
Q

How many scavenge pump do the oil pump and pressure filter housing have?

A

Seven

48
Q

What do scavenge pumps do?

A

Remove oil and contaminants from the bearing compartments and gearboxes.

The scavenge oil returns to the engine oil tank through the scavenge oil filter.

49
Q

Where is the breather in the vent system for lubrication located?

A

In the external gearbox.

50
Q

What does the breather in the vent system for lubrication do?

A

Removes air from the scavenge oil.

51
Q

What does the de-aerator do?

A

Separates the air from the incoming scavenge oil.

52
Q

How long is higher pressure present for after engine shut down?

A

5 minutes

53
Q

What two types of transmitter are used to monitor the oil?

A

Capacitance-type
Reed switch type

54
Q

What happens to the float in a reed type transmitter if the oil level falls?

A

The float also falls.

55
Q

What size particles do scavenge oil filters catch?

A

Parts more than 0.015 mm.

56
Q

What is done to particles found in the system?

A

Removed and sent for analysis.

57
Q

What process is used to find out about the internal wear of lubricated engine components.

A

Spectrometric Oil Analysis Program (SOAP).

58
Q

What are megnet chip detectors?

A

Detectors that catch metal particles that are attracted to the magnet.

59
Q

How can oil quantity be checked?

A

Sight gauges on the oil tanks or on the ECAM/EICAS displays in the flight deck.

60
Q

Where is the oil tank located?

A

Above the gearbox.

61
Q

What does the siphoning effect of the oil tank mean?

A

There is slow oil flow from the tank to the gearbox.

62
Q

What does the anti-siphon device do?

A

Prevents slow oil flow from the tank to the gearbox due to the siphoning effect.

63
Q

What should be observed when opening the filler cap?

A

The smell of the oil.

64
Q

Where are details of the required oil type found?

A

On a label close to the oil tank filler cap.

65
Q

Where is quantity of oil added stored?

A

The aircraft’s technical logbook.

CAA Module 15 (18 decks)

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