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M15 New > 15.9 > Flashcards

15.9 Flashcards

1
Q

Viscosity of ester based synthetic oils

A

3 centistokes ( 3mm2/s at 100 degrees c )

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2
Q

What viscosity did thickeners raise the ester synthetic oils to

A

7.5 centistokes

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3
Q

What properties did type 1 oils need

A

Resistance oxidation and thermal degradation

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4
Q

What is type 2 oil viscosity and used for

A

5 mm2/s used for improved thermal stability and high load carrying ability

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5
Q

4 uses of oil

A

Lubricate

Cooling

Cleaning

Corrosion protection

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6
Q

How is oil used to cool

A

Heat of the material transferred to the oil

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7
Q

3 types of synthetic oil

A

1 - used on old gas turbine engines

2 - used on modern GTE

3 - used on special aircraft (higher thermal stability and viscosity at higher temperatures than type 2)

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8
Q

3 Advantages of synthetic oils

A

Better viscosity

Better thermal stability

High pressure resistance

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9
Q

Disadvantage of synthetic oils

A

They have a high price

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10
Q

What is viscosity index

A

Effect temperature has on viscosity of the oil

Higher number indicates least affected by temperature

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11
Q

What is viscosity

A

Most important characteristic

Internal resistance of a fluid against deformation

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12
Q

What happens to viscosity at high temperatures

A

Low and vice versa

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13
Q

What is pour point

A

Lowest temperature oil will move in a 31.75mm test tube when held for 5 seconds

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14
Q

Type 2 oil pour point

A

-57 degrees C

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15
Q

What is oxidation resistance

A

Ability of oil to not react with oxygen as it gets thicker when it does

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16
Q

What’s volatility

A

Measure of ease a liquid is converted to a vaporous state

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17
Q

What’s acidity

A

Measure of the corrosive tendencies of the oil

18
Q

What’s coking

A

Amount of carbon residue remaining in the oil after subject to extreme heating

19
Q

What is fuel main components in %

A

16% hydrogen 84% carbon

20
Q

Most common fuel in Europe

A

Jet A1

(JP1A) - American name also JP5

21
Q

Most common fuel in USA

A

Jet A

(JP1) - American name

22
Q

What is jet B flash point and where is it used

A

-20 degrees C and used in Canada for its cold weather performance

23
Q

what is JP5 flash point and freezing point

A

Flash point - 65 degrees C

Freezing point - 48 degrees C

24
Q

Why does fuel used have to be recorded

A

Each fuel type has different handling and operating characteristics

25
Q

Jet A and A1 density

A

0.81 kg/Ltr at 15 degrees C

26
Q

What are additives measured in

A

Parts per million (PPM)

27
Q

What is prist

A

Diethylene glycol solutions that work as antifreeze agent

28
Q

What do anti-oxidants do

A

Prevent formation of gum depositor on fuel system components

29
Q

What does a static dissipator additive do

A

Reduce hazardous effects of static electricity generated by movement of fuel

30
Q

What does a metal deactivatos do

A

Suppress the catalytic effect

31
Q

What does a metal deactivatos do

A

Suppress the catalytic effect

32
Q

How do you clean oil off skin

A

Soap and warm water

33
Q

How do we clean oil out of eyes

A

Flush with fresh water

34
Q

Should you use open containers of synthetic oils and why

A

No because it can absorb moisture and become unstable

35
Q

What should you do if you ingest fuel

A

Drink 250ml of water and seek medical attention immediately

36
Q

How long do you wash your eyes for if fuel gets in your eyes

A

10 minutes

37
Q

How do you clean large spills

A

Washed away with plenty of water but avoid it entering drainage

38
Q

How are fuel leaks caused

A

Refuelling malfunctions or damage to the aircraft

39
Q

When can you not refuel

A

When engines are running

40
Q

What clothing is worn In fuel tanks

A

Special clothing made of cotton

M15 New (18 decks)

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