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Mod 6 > 6.6 > Flashcards

6.6 Flashcards

1
Q

What does a tube assembly consist of?

A

The tube and both tube fittings

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2
Q

How are tube dimensions determined?

A

The external diameter and the wall thickness

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3
Q

What units are used for tube external diameter?

A

1/8 increments

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4
Q

High pressure lines are defined by what pressure?

A

Over 1,500psi (105 bar)

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5
Q

Medium pressure lines are defined by what pressure?

A

Under 1,500psi (105 bar)

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6
Q

Low pressure lines are defined by what pressure?

A

Suction and return lines

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7
Q

What are high pressure lines normally made from?

A

Steel

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8
Q

What are medium and low pressure lines made from?

A

Aluminium alloys

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9
Q

What are lines in the engine area made from?

A

Steel

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10
Q

What are all pipes stamped with?

A

Part number, inspection stamp, test stamp, date of manurfacture

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11
Q

What is special about the MS flareless fitting?

A

It digs into the tube to seal it

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12
Q

How does a Harrison fitting work?

A

The tube gets moulded to create a seal in the fitting

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13
Q

What type of tubes is the Harrison fitting used on?

A

Thin-walled tubes

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14
Q

When is a permaswage fitting used?

A

When repairing damaged pipes

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15
Q

What is the main advantage of a permaswage fitting?

A

It can be done quickly in situ

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16
Q

What is the main disadvantage of permaswage fittings?

A

It cannot be separated after installation

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17
Q

What is the flare angle for aircraft flared fittings?

A

37°

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18
Q

What must happen if a leak is apparent from a correctly-tightened joint?

A

Dismantled and inspected

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19
Q

Why must you never over-tighten a joint if a leak is present?

A

It may result in total failure and need replacing

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20
Q

What are the two types of flares used on aircraft tubing?

A

Single flare and double flare

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21
Q

What are the two ways of creating a single flare?

A

Impact-type and roll-type

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22
Q

What is the preferred method of creating a single flare?

A

The roll-type

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23
Q

Why must single flares be manufactured to certain tolerances?

A

To ensure a leak-free joint

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24
Q

What type of tubes can double flaring be done on?

A

Soft aluminium with a external diameter of 3/8 or smaller

25
Q

Why is double flaring used?

A

It forms a better seal and more resistant to shearing

26
Q

In relation to tube damage what is meant by sharp-bottomed surface defect?

A

Loss of material with a sharp edge at the deepest point (scratch)

27
Q

In relation to tube damage what is meant by round-bottomed surface defect?

A

Los of material with a non sharp edge at the deepest point (abrasion)

28
Q

In relation to tube damage what is meant by a round-bottom surface impact?

A

A dent in the tube walling

29
Q

What does it mean if damage limitations are not described in the manual?

A

It is not permitted

30
Q

Why must you have slack between both fittings of a hose?

A

Because they reduce their length but increase in diameter when under pressure

31
Q

What percentage does a hose reduce in length when under pressure?

A

2-4%

32
Q

Why must hoses not twist when the end fittings are tightened?

A

Can be damaged or buckle when there is movement and can come loose

33
Q

What are the three types of hose ratings?

A

High, medium, low pressure

34
Q

What is the definition of a high pressure hose?

A

A hose that can handle anything above 3,000psi

35
Q

What is the definition of a medium pressure hose?

A

A hose that holds pressure between 600-3,000psi

36
Q

What is the definition of a low pressure hose?

A

A hose that holds pressures up to 600psi

37
Q

What is the job of a lay line?

A

To indicate whether the hose assembly has twisted?

38
Q

What colour are lay lines?

A

Yellow, red or white

39
Q

What can be found on lay lines?

A

MIL-SPEC numbers and manufacturers information

40
Q

What must the inner layer of a hose be compatible with?

A

The fluid being transported

41
Q

Why is a reinforcement layer (middle) used in hoses?

A

To give the hose its strength

42
Q

Why is a outer cover used on a hose?

A

To protect it from external physical damage or heat

43
Q

What is the outer cover of a hose normally made from?

A

Rubber-impregnated fabric or stainless steel braid

44
Q

What is meant by assembly length in relation to hoses?

A

The total length from both end fittings

45
Q

What is meant by hose length in relation to hoses?

A

The total length of from both ends of the rubber (including under fittings)

46
Q

Is it possible to re-use certain hose assembly end fittings?

A

Yes after thorough inspection

47
Q

How is a new hose assembly cleaned internally?

A

Compressed air is blown down both ends alternately

48
Q

How is a new hose proof tested?

A

It’s capped at one end and pressurised at 1 1/2 times working pressure

49
Q

Who can complete a hose proof test?

A

Only a trained specialist

50
Q

How often should a hose assembly be supported?

A

At least every 24 inches

51
Q

What determines bend radius?

A
  • Operating pressure
  • type of hose
  • normal size
52
Q

What are the three types of protective sleeves?

A
  • heat shrink
  • nylon spiral wrap
  • Teflon
53
Q

Why must you be careful removing old fire sleeves?

A

May contain asbestos

54
Q

What type of end does a standard MS fitting have?

A

A flareless end

55
Q

What type of end does a AN fitting have?

A

A flared end

56
Q

Why are quick disconnect couplings used?

A

Ease of use and elimination of hazards from exposed fuel

57
Q

What is special about the screw-type quick disconnect coupling?

A

You can hear clicking as the teeth engage

58
Q

How does a inst-o-magic push/pull quick disconnect work?

A

When pulling black the spring loaded outer shell the ball bearings on the inside loosen

59
Q

Why must you not used gripping tools to connect or disconnect coupling halves?

A

Because the desired tightness can normally be accomplished by hand

Mod 6 (17 decks)

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