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A&P Block 3 > Rigid Fluid Lines > Flashcards

Rigid Fluid Lines Flashcards

1
Q

AN fittings have a ______ Connection?

A

Flared Connection

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2
Q

What degree are AN flared fittings?

A

37 Degrees

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3
Q

What degree are AC flared fittings?

A

35 Degrees

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4
Q

What degree are MS flared fittings?

A

MS fittings do not have flares

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5
Q

When was copper tubing used extensively in aircraft?

A

During the early days of aviation

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6
Q

How does copper become hard and brittle in aircraft?

A

Vibration

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7
Q

How do we restore properties in copper?

A

Annealing

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8
Q

Aluminum allow tubing is used for?

A

General purpose lines of low or medium fluid pressures such as hydraulic and pneumatic. 1000 PSI - 1500 PSI

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9
Q

What is CRES?

A

Corrosion resistant steel tubing

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10
Q

Where are steel lines mainly used?

A

In areas where there is high risk of foreign object damage (FOD) such as the landing gear and wheel well areas.

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11
Q

Where are titanium lines used?

A

They are used extensively in transport and high performance aircraft and around engines.

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12
Q

True or false: Titanium is 50 percent stronger then steel and 30 percent lighter then steel.

A

False! Titanium is 30 percent stronger then steel and 50 percent lighter then steel.

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13
Q

How do we positively identify the material used in the original line installation?

A

Compare code markings on replacement tubing.

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14
Q

On large aluminum alloy tubing the alloy designation can be found where?

A

Stamped on the surface.

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15
Q

On small aluminum tubing the alloy designation maybe __________; but more often is shown by a __________

A

MAYBE stamped on the surface, Color code

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16
Q

How do we size rigid tubing lines?

A

By the outside diameter and wall thickness

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17
Q

OD tubing is sized in what increments?

A

1/16 inch

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18
Q

A #6 rigid tube is what size?

A

6/16ths or 3/8ths

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19
Q

Wall thickness is specified in what increment?

A

Thousandths of an inch

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20
Q

How do we find the OD of a tube?

A

ID + 2 wall thickness

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21
Q

How do we find the ID of a tube?

A

OD - 2 wall thickness

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22
Q

How do we find total wall thickness?

A

OD - ID

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23
Q

How do we find 1 wall thickness?

A

OD - ID divided by 2

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24
Q

Replacement tubing should be what?

A

The same sized material as the original line or approved substitute.

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25
Q

How do we ID the material if there are no markings?

A

Hardness, Acid and Magnetic testing methods

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26
Q

Fabrication of tube assemblies consists of what?

A

Cutting, deburring, bending and tube joint preparation

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27
Q

How do we cut rigid tubing?

A

Roll cutters or Fine tooth hacksaw with 32 teeth per inch.

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28
Q

When you cut tubing you should always cut ______ for bending variations.

A

10% extra material

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29
Q

What is the objective of cutting rigid tubing?

A

To produce a square end free from burrs.

30
Q

How do we deburr a tube?

A

Deburring tool

31
Q

The objective of tube bending is to obtain what?

A

A smooth bend without flattening the tube.

32
Q

Tubing under _____ inch diameter can be bent without the use of a bending tool.

A

1/4

33
Q

A small amount of flattening in bends is acceptable but must not be less then ______ percent of the original OD

A

75%

34
Q

Fittings for tube connections are made of what materials?

A

Aluminum alloy, titanium, corrosion resistant steel and brass and bronze

35
Q

What are the 5 classifications of tube fittings?

A

Flared, Flareless, Swaged, Beaded, brazed and welded

36
Q

The two major tube joint fittings are the _______ and ______.

A

Flared and Flareless

37
Q

What are the benefits of a double flare over a single flare?

A

A double flare seals better and is more resistant to the shearing effect of torque.

38
Q

What tube size are double flares mostly used in?

A

3/8 and smaller

39
Q

Presetting is only required on what type of fitting?

A

MS fittings

40
Q

What does PHDAN stand for?

A

Physically Dangerous

41
Q

What lines are marked as PHDAN?

A

Lines with oxygen, nitrogen or Freon

42
Q

What color code and symbol is a fuel line?

A

Red with Diamonds

43
Q

What color code and symbol is water injection?

A

Red and Grey with chevrons pointing down

44
Q

What color code and symbol is electrical conduit?

A

Orange with lightning bolts

45
Q

What color code and symbol is compressed gas?

A

Orange with diagonal rectangles

46
Q

What color code and symbol is instrument air?

A

Orange and blue with crisscrossing lines

47
Q

What color code and symbol is coolant?

A

Blue with wavy rectangles

48
Q

What color code and symbol are hydraulic lines?

A

Blue and yellow with circles

49
Q

What color code and symbol are lubrication lines?

A

Yellow with squares

50
Q

What color code and symbol is breathing oxygen?

A

Green with rectangles

51
Q

What color code and symbol is Deicing?

A

Grey with triangles

52
Q

What color code and symbol is fire protection?

A

Brown with squared diamonds

53
Q

What color code and symbol is air conditioning?

A

Brown and grey with random sized circles

54
Q

What is the warning symbol?

A

white background with black skull and bones

55
Q

List the 5 fluid line end fittings?

A

Universal bulkhead fittings, AN flared, MS flareless, swaged fittings and AC fittings

56
Q

What color are aluminum alloy fittings?

A

Blue

57
Q

What color are carbon steel fittings?

A

Black

58
Q

What color are CRES fittings?

A

Natural

59
Q

What color are Aluminum-bronze fittings?

A

Cadmium plate (goldish)

60
Q

What color are titanium fittings?

A

Natural to grey

61
Q

Describe Cryofit fittings.

A

The sleeve is manufactured 3% smaller, frozen in liquid nitrogen and expanded 5% larger than the line. Sleeve is removed from the liquid nitrogen and inserted on to the tube where the sleeve contracts to its original 3% smaller size and creates a permanent seal.

62
Q

What color are AC fittings?

A

Grey or yellow

63
Q

What is the difference between a AN fitting and a AC fittings?

A

AN fittings have 37 degree flares and AC fittings have 35 degree flares and are slightly longer.

64
Q

The liquid medium for proof testing tube assemblies should be what?

A

Hydraulic fluid, water or oil

65
Q

What should oxygen tubing be proof tested with?

A

Dry nitrogen

66
Q

True or False: You should always apply a compound to the faces of the fitting or flare.

A

FALSE. You should never apply any compound as it will destroy the metal on metal contact between the fitting and flare.

67
Q

If an AN flared tube assembly leaks after being tightened to the proper torque what steps do you take next?

A

Disassemble the line for repair or replace the line completely

68
Q

What can be done if a flareless tube assembly leaks?

A

It can be tightened 1/16th turn beyond the noted torque

69
Q

Leakage of a flared tube assembly is usually caused by what?

A

Flare distortion in the nut threads, sleeve cracked, flared out of roundness, flare is cracked or split

70
Q

Tubing that has nicks scratches or dents are acceptable if the dent has a depth of what?

A

Less than 20% of the tubing diameter unless its in the heel of a short bend radius

71
Q

A nick or scratch of that has a depth of less then _____ of the wall thickness on aluminum or steel should be reworked before it is acceptable.

A

10%

A&P Block 3 (1 decks)

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