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M15 > M15.10 Lubrication Systems > Flashcards

M15.10 Lubrication Systems Flashcards

1
Q

What is the main function of the lubrication system?

A

. Distributes oil to the engine bearing components and gear boxes

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2
Q

What lubrication systems do most turbine engines use?

A

A self contained dry sump lubrication system

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3
Q

What is the oil revisor and supply system also called?

A

. Pressure oil system

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4
Q

Where is the supply filter located?

A

Downstream of the supply pump which removes any fod

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5
Q

What does the supply filter prevent regarding the nozzle??

A

Prevents blockage of oil nozzle

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6
Q

What is the purpose of the scavenged system??

A

. It’s part of the every day dry sumo lubrication system, and returns the oil from bearing compartments and gearboxes to oil tanks

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7
Q

By having a scavenge system what does this prevent?

A

Accumulation of oil in bearings and gearboxes

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8
Q

What does the vent system do?

A

Releases air from lubrication systems to the atmosphere

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9
Q

How many scavenge pumps are there per line??

A

. One

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10
Q

What does the oil monitoring system do?

A

Measures and indicates oil quantity, oil pressure and oil temperature

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11
Q

What are the 5 different types of sensors??

A

. Oil quantity sensor
. Oil pressure sensor
. Oil temperature sensor
. Low oil pressure switch
. Filter clogging switch

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12
Q

What do mechanical clogging indicators do?

A

. Indicate a clogged filter when the engine has stopped

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13
Q

What is another name for mechanical clogging indicators?

A

Pop out indicators

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14
Q

How can contamination be checked?

A

By inspecting filters and using magnetic chip detectors

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15
Q

Where are magnetic chip detectors installed??

A

In individual scavenge lines of each sump which makes it easy to isolate source of contamination

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16
Q

What is a main advantage of magnetic chip detectors in accordance to maintenance??

A

They are easily removed for inspection

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17
Q

Where is the oil quantity transmitter installed??

A

At the top of the oil tank which allows the transmitter to be changed without draining the tank

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18
Q

What are the two types of transmitters?

A

. Capacitance
. Reed switch type

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19
Q

What is the oil pressure transmitter connected to??

A

. Oil supply line and to the oil tank vent oil line

20
Q

How does the oil pressure transmitter work?

A

. Senses pressure difference between total oil pressure in oil supply line and the vent pressure in oil tank

21
Q

What does the low oil pressure switch do??

A

If oil pressure deaconesses below the limit the switch closes and signal is sent to flight warning computer and appears in display unit cockpit.

22
Q

What are two types of oil temperature sensors?

A

. Thermocouple
. Thermistor

23
Q

The engine low oil pressure warning is always accompanied by what??

A

An acoustic warning in the cockpit

24
Q

What does SOAP stand for??

A

Spectrometric oil analysis program

25
Q

What is the function of SOAP??

A

. Find out about internal wear if lubricated engine components

26
Q

What size particles can SOAP find??

A

. Particles so small that can’t even be caught my oil filters
. 0.001mm - 0.02mm

27
Q

When are oil samples taken for soap??

A

From the oil tank at regular intervals and sent to the laboratory for analysis

28
Q

What size particles does the scavenge system detect??

A

. Large particle sizes of more than 0.015mm

29
Q

What is the main problem with scavenge systems?

A

. The filter is not changed very often and filter inspection takes a lot of time

30
Q

Why are magnetic chip detectors better?

A

. Easier
. less time consuming to get the condition of the oil content
. Easily removed and checked

31
Q

Briefly what do magnetic chip detectors do?

A

. It catches metal particles which are attracted to the magnet.

32
Q

How does an electric magnetic chip detector work?

A

. The chip detector has two magnets at the tip
. The restistanve between the two magnetic is monitored by the electronic control unit.
. resistance decreases when particles connect with the magnet.
. When resistance goes past a certain point the electronic control unit sends a message for post flight report.

33
Q

Where is the oil tank located?

A

. Above the level of the gearbox

34
Q

To prevent slow from the oil tank to the gear box due to siphon effect, what is in place?

A

. Anti- siphon device is fitted

35
Q

On engines without an anti- siphon device, what should you do?

A

. Check the oil quantity between 5-20 minutes after the engine is shut down when all the oil is in the tank

36
Q

Where can the oil quantity be checked

A

. At sight quages on the oil tanks
. ECAM/ EICAS

37
Q

Where do you refill the oil?

A

. Via the oil tank filler port
. You must wait 5 minutes after the engine is shut down before you can open the oil tank filler cap

38
Q

What are the two methods of oil refilling?

A

. Oil cans
. Oil servicing system

39
Q

What type of system do oil cans use?

A

Gravity refuelling

40
Q

What type of system do oil servicing system use?

A

Pressure refilling

41
Q

What should you always ensure when topping up the oil?

A

. That it’s the correct type and the same manufacture

42
Q

What should you do regarding the tech log when refilling the oil?

A

. Enter the quantity of oil added

43
Q

What saftey precautions should you do when SOAP sampling?

A

. Use a new plastic bottle to prevent contamination
. Wait at least 5 mins after engine is shut down
. Wear gloves to protect your hands
. Close the bottle and label it

44
Q

What is significant about a magnetic chip detector inspection?

A

. Maintenance staff must only check 1 engine detector and a cross check by a second mechanic to reduce working errors

45
Q

What are the two seals used in chip detectors?

A

. Reusable seal
. O ring

46
Q

On some some magnetic chip detectors they have 2 O-rings, what needs to happen??

A

. The old O rings must be replaced with new ones to help prevent leakages

M15 (10 decks)

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