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Module 15 Richard > 15:10 Basic Lubrication Systems > Flashcards

15:10 Basic Lubrication Systems Flashcards

1
Q

What is the purpose of the lubrication system

A

To distribute oil to the engine bearing compartments and the gearboxes

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2
Q

What type of lubrication systems do most modern gas turbine engines use

A

A self contained dry sump lubrication system

The oil is recirculated through this system by pumps. The system keeps the oil in a fit condition to perform its tasks

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3
Q

What 4 subsystems does a basic lubrication system have

A
  • An oil reservoir and supply system
  • A scavenge system
  • A vent system
  • A monitoring system
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4
Q

What is the oil reservoir and supply system also called

A

The pressure oil system

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5
Q

What are the main components of the pressure oil system

A
  • The oil tank
  • The supply lines
  • The supply pump
  • The supply filter
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6
Q

Where is the oil stored

A

In the oil tank and pumped by the supply pump through the supply lines to the oil nozzles in the engine bearing compartments and the gearboxes

The oil is filtered before it reaches the nozzle

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7
Q

Where is the oil filter located

A

Downstream to the supply pump

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8
Q

What is the purpose of the scavenge system

A

It returns the oil from the bearing compartments and the gearboxes to the oil tank.

This prevents the accumulation of lubrication oil in the bearing compartments and gearbox

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9
Q

What is the purpose of the vent system

A

It releases air from the lubrication system to the atmosphere

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10
Q

How does the vent system release air to the atmosphere

A

Bearing compartments have a vent line to release the sealing air and maintain the airflow across the seals

Vent air leaves the shaft at the rear of the engine

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11
Q

What is the purpose of the oil monitoring system

A

The oil monitoring system measures and indicates oil quantity, oil pressure and oil temperature

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12
Q

What sensors does the oil monitoring system use

A
  • The oil quantity sensor
  • The oil pressure sensor
  • The oil temperature sensor
  • The low oil pressure switch
  • The filter clogging switch
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13
Q

What is used to indicate a blocked filter

A

Mechanical clogging indicators are used to indicate a clogged filter when the engine is stopped. They are also called pop out indicators

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14
Q

Why would you need to check a magnetic chip detector

A

Contamination can be checked by checking filters and magnetic chip detectors

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15
Q

What is a magnetic chip detector

A

Small magnets which are in contact with the scavenge oil. They collect particles of magnetic metal which are passing through the oil

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16
Q

Where are magnetic chip indicators located

A

In the individual scavenge line for each sump. This makes it easy to isolate the source of contamination

17
Q

The oil quantity transmitter in the tank sends the information via a computer , which performs the measurement. What is this called

A

The Engine Interface Unit (EIU)

18
Q

Where is the oil quantity transmitter usually installed

A

At the top of the oil tank

This allowed the transmitter to be changed with out draining the tank

19
Q

What two types of quantity transmitter are used

A
  • The capacitance type transmitter

- The reed switch type transmitter

20
Q

What is the oil pressure transmitter connected to

A

The oil supply line and to the oil tank vent line

The transmitter senses the pressure difference between the total oil pressure in the oil supply line and the vent pressure in the oil tank

21
Q

What is the oil low pressure warning always accompanied by in the cockpit

A

An acoustic warning

22
Q

Why would an additional pressure switch is also used in the engine oil system

A

To initiate a low oil pressure warning

23
Q

What are the two different types of oil temperature sensor

A
  • The thermocouple

- The thermistor

24
Q

What is used to find out about internal wear of lubricated engine parts

A

Spectrometric Oil Analysis Program (SOAP) is used

25
Q

What kind of particles can SOAP find that filters cannot pick up

A

Particles that range in size from 0.001mm to 0.02mm

26
Q

The scavenge oil filter element catches larger particles which are the size of?

A

0.015mm or bigger

Particles are removed and sent for analysis

27
Q

What is the easiest method of checking for oil contamination

A

Magnetic chip indicators.

Particles are attracted to the magnets and they are easily removed for inspection

28
Q

How does an electric magnetic chip detector work

A

There are two magnets at its tip, the resistance between the two chip detector magnets is monitored by the Electronic Control Unit

The resistance decreases when particles connect with the magnets

29
Q

How can the oil quantity be checked

A

At the sight gauges on the oil tanks on the engine, or on the ECAM or EICAS displays in the cockpit

30
Q

As the oil tank is fitted above the gearbox what is used to prevent the gearbox being filled with oil

A

An anti siphon device

31
Q

On engines with out an anti siphon device how quickly do you need to check the oil quantity after the engine has shut down

A

Between 5-20 mins when all of the oil is in the tank

32
Q

Why should you wait 5 mins before opening the oil filler cap

A

Hot oil could spray out

33
Q

What is the oil filling process called using oil cans

A

Gravity filling

34
Q

What is oil filling called when using an oil servicing system

A

Pressure filling

35
Q

What safety procedures must be observed for SOAP sampling

A
  • Always use a new plastic bottle and a new hose to prevent contamination of the oil
  • Remember to wait at least 5 mins after engine shut down before opening the oil tank filler cap
  • Wear gloves to protect your hands as the oil can be hot
  • Close the bottle and label immediately after the sample is taken
36
Q

What must the SOAP sampling bottle label have on it

A
  • Details of aircraft registration
  • The engine position
  • The engine serial number
  • The station where the sample is taken
  • Date and time of sample
37
Q

When removing a mag chip detector what must be done after you have removed it but before checking it

A

You must check to see the check valve closes behind the detector to prevent a leak

38
Q

Why can maintenance staff only check one engines mag detector in one day

A

As the wrong installation could cause an oil leak

The job must be cross checked by a second mechanic to ensure the job has been carried out correctly

39
Q

What 2 seals can mag chip detectors have

A
  • A reusable seal

- An O ring

Module 15 Richard (18 decks)

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