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M15 GTE > lubrication Systems > Flashcards

lubrication Systems Flashcards

1
Q

What’s the purpose of a lubrication system

A

Distribute oil to engine bearing compartment & gearboxes

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2
Q

What type of lubrication system is used in modern gas turbine engines

A

Self contained dry sump lubrication system

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3
Q

How is oil recirculated

A

By use of pumps

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4
Q

When is oil filtered

A

Before it reaches oil nozzle to remove foreign objects

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5
Q

Where is the supply filter

A

Downstream of supply pump

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6
Q

Why does supply pump filter oil

A

to prevent blockages of oil nozzles

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7
Q

What does the scavenge system do

A

Prevents accumulation of lubricant oil in bearing compartments & gearboxes and returns it to oil tank

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8
Q

How many scavenge pumps per line

A

1

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9
Q

How does a vent system work

A

Releases air from lubrication system to atmosphere

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10
Q

What does the vent line do in the bearing compartment

A

Release sealing air to maintain airflow around seals

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11
Q

What shaft does vent air leave

A

Shaft at rear of engine

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12
Q

What bearing is vent air taken from to gearboxes

A

Air is taken from forward bearing compartment via radial drive shaft housing

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13
Q

How does oil monitoring work

A

Measures and indicates oil quantity , oil pressure and oil temp

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14
Q

What indicator does a mechanical clog use

A

Pop out

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15
Q

Where is a magnetic chip detector installed

A

In the individual scavenge lines

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16
Q

How does the oil quantity transmitter work

A

Sends info via a computer which performs the measurement

17
Q

What is an EIU

A

Engine Interface Unit

18
Q

What’s the two types of transmitters

A

Reed switch and capacitance

19
Q

How does a low oil pressure switch work

A

When oil pressure goes below a limit the switch closes which sends a signal to flight warning computer

20
Q

Where are oil temperature sensors found

A

In scavenge system

21
Q

Two types of temperature sensor

A

Thermocouple and thermistor

22
Q

How do you find out about the internal wear of lubricated engine components

A

Soap - spectrometric oil analysis program

23
Q

What’s the smallest size particle the scavenge system can catch

A

0.015mm

24
Q

What’s bad about the scavenge oil filter

A

Filter not changed often and can take a long time for inspection

25
Q

What’s an advantage for the magnetic chip

A

Easier method & less time consuming

26
Q

Where is the magnetic chip located

A

Located in scavenge lines

27
Q

How are magnetic chip checked

A

Manually and some electrically

28
Q

How many magnets in the tip of the magnetic chip

A

2

29
Q

How is system servicing checked

A

On sight gauges on oil tanks of the engines or on ECAM/EICAS displays in cockpit

30
Q

When do we check oil quantity on engines without an anti-siphon valve

A

5-20m after shut down as oil will still be in the tank

31
Q

Why do we wait at least 5 minutes before checking engine oil

A

If u open before hot oil can spray out filler port

32
Q

Where do u put the amount of oil used to refill the engine

A

Into tech log to monitor its consumption

33
Q

Why do we use a transparent hose for the overflow port

A

You can see when the tank is full

34
Q

What do we use to take a soap sample

A

Plastic bottle with a hose , make sure they are new to prevent contamination

35
Q

What are the two seals used in chip detection

A

Reusable and oring

36
Q

Why are old o rings replaced

A

To prevent leakage

37
Q

Purpose of a de-oiler in vent system

A

Separate oil from air before it is vented overboard

38
Q

What type of pumps is an oil pump

A

Positive displacement pump

M15 GTE (19 decks)

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