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M6 > 6.6 > Flashcards

6.6 Flashcards

1
Q

Where are flexible hoses generally used?

A

With moving parts or hose is subjected to vibration

(Landing gear typicaly use both)

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2
Q

Why was copper tubing stopped being use in early aircraft?

A

Became hard or brittle from vibration

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3
Q

Ridgid tubing is used in stationary applications and long straight runs what systems typically use rigid tubing?

A

Fuel, oil, oxygen and some instrument systems

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4
Q

What systems do aircraft landing gear use?
And why?

A

Both types rigid because of durability of metal and flexible for the gear extension and retraction

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5
Q

What does a rigid fluid line assembly consist of?

A

The tube and both tube fittings

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6
Q

How are rigid fluid lines dimensions determined and what are increments do wall thickness go up?

A

Rigid tubing is measured by its external diameter and goes by 1/8 inch increments

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7
Q

If the material quality is higher what same pressure can be achieved with a loss of?

A

Wall thickness material can be reduced since the material is stronger

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8
Q

What material over aluminium is being used for fluid lines since it allows greater operating _____ and longer ________ _______?

A

Steel fluid lines
Operating saftey
Longer life expectancy

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9
Q

What is the pressure/use of High, Medium and low pressure lines?

A

High- Over 1500 PSI
Medium- Up to 1500 PSI
Low- Suction and return lines.

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10
Q

What material are medium and low pressure fluid lines preferably made of for weight saving?

A

Aluminium alloys

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11
Q

Fluid lines near engines in danger of fire and landing gear danger of stones must be made of what?
And what is the substitution and why?

A

Steel
Or Titanium for weight saving

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12
Q

What must fluid lines match and be free of so they maintained there necessary seal over longer operating periods?

A

Must match their axis and be free of tension.

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13
Q

Neoprene pipes is suitable for what?

A

Petroleum based fluids

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14
Q

Aircraft fittings have a flare angle of?
Automotive is?

A

37 degrees (aircraft)
45 degrees (Automotive)

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15
Q

What is Butyl suitable for?

A

Hydraulic fluid (e.g skydrol)

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16
Q

What is a swaged fitting
And how do you take it out

A

Permanent fitting line used where quick disconnect are not required

Cut it out to remove

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17
Q

What is a swivel fitting

A

A fitting that allows flexability and movement

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18
Q

What increments is rigid tubing and flex tubing measured in?

A

Rigid- 1/8
Flex- 1/16

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19
Q

What 2 methods can pipes be marked?

A

Stencilled or surface ink stamp

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20
Q

What colour is 1100 aluminium alloy?

A

White

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21
Q

What colour is 3003 aluminium alloy?

A

Green

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22
Q

What colour is 2014 aluminium alloy?

A

Grey

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23
Q

What colour is 2024 aluminium alloy?

A

Red

24
Q

What colour is 5052 aluminium alloy?

A

Purple

25
Q

What colour is 6053 aluminium alloy?

A

Black

26
Q

What colour is 6061 aluminium alloy?

A

Blue and Yellow

27
Q

What colour is 7075 aluminium alloy?

A

Brown and yellow

28
Q

In areas oily, hot or cold where tape or decals can’t be used what is used instead

A

Metal tags

29
Q

What is a threaded fitting that allows pipe work to be separated and reconnected without causing deformation to the pipes?

A

Pipe connectors/ unions (mainly used in hydraulic and fuel systems)

30
Q

What does a flared tube fitting consist of?

A

A sleeve and a flare nut (this prevents damage to the flare and provides strength and support)

31
Q

What are single flares formed with?

Why do single flares have to be manufactured to specific tolerances?

A

A impact type flaring tool

Ensure a strong, leak-free joint

32
Q

Any aluminium tubing under ___ of a inch can be double flared it provides a better seal

If made too small or big what can happen?

A

3/8 of a inch or under

Small leak or pull apart
Big interfere with installation

33
Q

If a fitting leaks when torqued what should you do?

A

Flare and fitting must be inspected

34
Q

What tool is used to double flare a tube? (Man)

A

Manual flaring tool

35
Q

What are AN and AC fittings

A

AN-Army and Navy

AC-Air Corps

36
Q

What spec fitting was the majority in early aircraft?

A

AC- Air Corps

37
Q

What is the difference between AN and AC

A

Main point AN is longer and has shoulder
AN has a shoulder between the thread and flare cone <=:::: (AN gap before thread) <::::(AC)
and AN is longer

38
Q

What colour are AN steel fittings and aluminium

A

Steel-Black

Aluminium- Blue

39
Q

What are the 2 types of flareless connectors?
And what is similar but different with them?

A

MS and Harrison same thread but not interchangeable

40
Q

ba are posh cunts

A

Yes they are

41
Q

Raony is the goat

A

Of course

42
Q

What is special about a MS fitting

A

Pre stressed shape inner cutting edge is pushed over pipe to seal

43
Q

What is special about a Harrison fitting?

A

Ball-bush fitting as seal and not moulded
Suited well for thin walled tubes and vibration resistant.

44
Q

What parts do the Harrison fitting consist of?

A

The Tube, Sleeve and Nut

45
Q

What commonly used repair system is for repairing hydraulic lines on aircraft?

A

Permaswage fittings

46
Q

What identification is 5 in a MS fitting?

A

Corrosion resistant steel (CRES)

47
Q

What identification is 4 in a MS fitting?

A

Cadmium Coated

48
Q

What identification is 4 in a MS fitting?

A

Cadmium Coated

49
Q

What identification is D in a MS fitting?

A

Anodised

50
Q

What are flexible fluid lines called and what are they constructed of to provide flexibility?

A

Hoses

Synthetic componds

51
Q

What are flexible fluid lines used for?

A

Aircraft fluid systems to connect moving parts to stationary

52
Q

What 3 properties/constructiom do flexible fluid lines consist of?

A

Inner liner
Layers of reinforcement
Outer cover

53
Q

What is Buna-N used to carry?

A

Petroleum based liquids

54
Q

What is an advantage of Teflon inner liners?

A

Broad operating temps -240 C to 204 C

55
Q

What pressure is low-pressure hoses?

A

Up to 600psi

56
Q

What pressure is medium-pressure hoses?

A

Up to 3000psi?

57
Q

What pressure is high-pressure hoses?

A

Over 3000psi

M6 (5 decks)

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