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Module 15 > M15.10 Lubrication Systems > Flashcards

M15.10 Lubrication Systems Flashcards

1
Q

Basic oil sub systems

A
  • Reservoir and supply
  • Scavenge
  • Vent
  • Monitoring
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2
Q

Where is the supply filter located in regards to the supply pump

A

Downstream

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3
Q

What are oil seals

A

Inner seals preventing oil escaping from the cavities

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4
Q

What are air seals

A

Outer seals that minimise the air escaping from the cavities

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5
Q

What is the carbon ring in the bearing compartment

A

A static ring of carbon which rubs against the seal seat

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6
Q

What is the seal seat

A

A rotating collar on the engine shaft

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7
Q

What is used to maintain contact between the seal seat and the carbon ring

A

Springs

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8
Q

Why is the bearing compartment referred to as a dry sump

A

The scavenge pumps remove oil faster than it’s injected

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9
Q

Where is the oil cooler installed in regards to the filter

A

Downstream

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10
Q

How does the vent system supply air from the FWD bearing compartment to the gearboxes

A

Via the radial drive shaft housing

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11
Q

Oil system monitoring sensors

A
  • Quantity
  • Pressure
  • Temperature
  • Low oil px
  • Filter clogging
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12
Q

How is contamination checked in the oil system

A

Inspection of filter and MCD

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13
Q

Simplest type of oil supply system

A

Full flow

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14
Q

Which system has no way of regulating oil pressure

A

Full flow

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15
Q

What changes oil pressure in a fully flow system

A
  • N2 speed
  • Oil temp
  • Total flow area
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16
Q

Difference between full flow and constant pressure system

A

Constant pressure has a pressure regulating valve

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17
Q

Disadvantages of full flow

A

Large supply pump or high pressure

Rise in oil temp after power reduction

18
Q

Oil tank supply lines and their locations

A
  • Pump supply - bottom
  • Scavenge oil line - top
  • Vent line - top
19
Q

Anti - siphon device purpose

A

Prevents oil from flowing through the supply line to the lowest point in the system

20
Q

What could happen if there was no anti siphon device in the supply line

A

All the oil could be transferred to the accessory gearbox

21
Q

Purpose of de-aerator and its location

A

At the inlet for the scavenge oil line

Remove air from scavenge line

22
Q

How long is the higher air pressure in the tank after engine shutdown

A

5 minutes

23
Q

What surrounds the oil filler, that catches the spilled oil and drain to the engine mast

A

Scupper

24
Q

Are positive or negative displacement pumps used

A

Positive displacement pumps

25
Q

Types of pumps used

A
  • Gear pumps
  • Gerotor pumps
  • Vane pumps
26
Q

Filter parts

A
  • Filter housing
  • Removable cover
  • Filter bypass
  • Electric clogging indicators
27
Q

Where is a filter with a paper medium not normally used

A

Scavenge filters

28
Q

What type of filter is always a disposable cartridge

A

Paper

29
Q

If the heat exchanger is installed in the supply line what is the system called

A

Hot tank system

30
Q

What defines a cold tank system

A

Heat exchanger installed in the scavenge line

31
Q

Main types of heat exchanger

A
  • Fuel cooled heat exchangers
32
Q

Where are air cooled heat exchangers normally used

A

Turboprop and APU

33
Q

Oil quantity transmitter types

A
  • Capacitance
  • Reed Switch
34
Q

Two main types of pressure sensors

A
  • Bourdon Tube type
  • Strain gauge type
35
Q

Two main types of temperature sensors

A
  • Thermocouple
  • Thermister
36
Q

SOAP

A

Spectrometric Oil Analysis Program

37
Q

What size of particles can SOAP detect

A

0.001mm to 0.02mm

38
Q

When should engine oil quantity be checked after shutdown with out a anti-siphon

A

5 to 20 mins

39
Q

Why is a oil overfill dangerous

A

Large mounts of oil can be pumped through the vent line into the FWD bearing compartment or the de-oiler

40
Q

Which seals must be replaced on a magnetic chip detector

A

O-rings

Module 15 (20 decks)

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