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Flashcards in LUBRICATION SYSTEMS Deck (23)
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1
Q

What type of lubrication System do most gas turbine engines use?

A

Self contained Dry slump lubrication

2
Q

What sub-systems does the basic lubrication system consist of?

A
  • oil reservoir and supply system
  • scavenge System
  • vent system
  • monitoring system
3
Q

What is the oil reservoir system also know as?

A

Pressure oil system

4
Q

What components are contained within the pressure oil system?

A
  • oil tank
  • supply lines
  • supply pump
  • supply filter
5
Q

Where is the supply filter located and what is its purpose?

A

Downstream of supply pump.

- removes foreign particles from oil before it reaches oil nozzles.

6
Q

What is a scavenge System for?

A

Returning oil from bearing and gearbox components to the oil tank, to prevent accumulation of lubrication.

7
Q

Why is a vent system used?

A

Releases air from system into the atmosphere.

  • air pumped into the forward bearing and gearbox to replace air pumped out by the scavenge System.
8
Q

Why would bearing compartments have a vent system?

A

Release sealing air and maintain airflow across the seals.

9
Q

What is required when air is pumped into the oil tank by the scavenge System?

A

Removal of the air.

10
Q

What is the oil monitoring system?

A

Measures oil quantity, oil pressure and oil temp.

Sends signals to cockpit if pressure low or scavenge filter is blocked

11
Q

What sensors does a oil monitoring system require?

A
  • quantity
  • pressure
  • temp
  • low pressure switch
  • clog switch
12
Q

How can contamination in the oil be inspected?

A

Magnetic chip detectors, inspecting filters

13
Q

Where are magnetic chip detectors located?

A

Usually on individual scavenge lines to make the source of contamination finding easy.

14
Q

What are the types of quality transmitters and where are they usually located?

A
  • capacitance
  • reed

(On top of oil tank so it can be changed without draining the tank)

15
Q

What is the low oil pressure switch warning accompanied with in the cockpit?

A

An acoustic warning

16
Q

What are the two main types of temperature sensor?

A
  • thermistor

- thermocouple

17
Q

What is Spectrometric Oil Analysis Programme (SOAP) for?

A

Find about internal wear of lubricated engine components.

Particles between 0.001mm - 0.02mm

18
Q

What size particles does the scavenge oil filter collect?

A

Larger particles (more than 0.015mm)

Problem with this is that filter does not get changed very often and each inspection takes time.

19
Q

What is an easier and less time consuming method of gaining information about the condition of oil?

A

Magnetic chip detectors.

20
Q

When does the resistance of the magnetic chop detector decrease?

A

When particles connect with the magnets.

Electronic control unit sends maintenance message when resistance is too low.

21
Q

Why is there a slow flow of oil from the tank to the gearbox?

A

Siphon effect (anti-siphon device installed)

Important to check oil quantity between 5-20 mins after engine shutdown.

22
Q

Why is an oil overflow dangerous?

A

Oil can be pumped into forward bearing compartment of de-oiler.

23
Q

What must always be replaced when removing magnetic chip detectors?

A

O rings

Or use the reusable seal