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6.6 Flashcards

1
Q

What does the wall thickness of a rigid tube go up in increments ?

A

1/8 inch

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2
Q

What fluid line would hold over 1500psi ?

A

High pressure
( aluminium alloy )

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3
Q

What fluid line would hole under 1500psi ?

A

Medium pressure lines
( aluminium alloy )

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4
Q

What material for fluid lines is used in engines ?

A

Steel due to heat and possible fod damage

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5
Q

What increments is used for the part number of a rigid tube ?

A

1/16

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6
Q

Where is the wall thickness printed on a tube ?

A

Outside in thousandths of an inch

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7
Q

What’s written on outside of pipe ?

A

Date of manufacture, inspection stamp, system identification.

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8
Q

Whats 2 ways of identifying a tubes alloy designation ?

A
  1. Colour code on surface
  2. Stamped on surface
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9
Q

What colour of band is 2024 alloy ?

A

Red

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10
Q

How are fluid lines identified ?

A

By tape or decal made jump of colour codes.
- this also shows each lines function, fluid content, and hazards.

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11
Q

What can be used to mark fluid lines in oily hot or cold environment ?

A

Steel tags

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12
Q

Whats used to mark fluid lines in engine ?

A

Paint due to any tags etc being sucked into the engine.

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13
Q

Fluid lines marked PHDAN means what ?

A

It carry’s dangerous materials - oxygen, nitrogen, freon

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14
Q

What’s the two common pipe fittings

A
  1. Standalone fitting
  2. Ball valves
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15
Q

What does a flared tube consist of ?

A
  1. Sleeve
  2. Flare nut
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16
Q

What’s the use of a flare nut and sleeve ?

A

Flare nut attaches tube to other tube or components whilst the sleeve protects nut from damage. Sleeve also adds strength against vibration.

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17
Q

What’s the flare angle of aircraft fittings ?

A

37 degrees

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18
Q

What’s the two types of flares used in aircraft piping systems ?

A
  1. Single flare
  2. Double flare
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19
Q

How is a single flare formed ?

A
  1. Impact type flaring tool
    Or rolling action
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20
Q

What flare does anything with a outside diameter under 3/8 inch have ?

A

Double flare

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21
Q

What advantage does a double flare have over a single flare ?

A
  1. Provides better seal
  2. More durable and resistant to shearing
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22
Q

What should you not do to a leaking fitting on tube ?

A

Over tighten it

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23
Q

What’s the 2 flared fittings identifications

A

AN - Army,navy
AC - Air corps

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24
Q

What’s the difference of a AN (army navy) fitting to a AC (air corps) fitting ?

A

AN - has a shoulder between end of thread and flare cone, and is longer.
AC - doesn’t have shoulder, and is shorter.

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25
What colour are AN steel and AN aluminium fittings ?
AN steel - Black AN aluminium - blue
26
What are flareless tube fittings used for ?
To attach two sections of pipe together and commonly have a sleeve in them.
27
How do you create a strong leak free joint in assembly of a flareless tube fitting ?
Tighten nut compressing sleeve between receiving fitting.
28
What’s the two types of flared fitting ?
MS Fitting Harrison fitting
29
What three parts does a Harrison fitting consist of ?
1. Tube 2. Sleeve 3. Nut
30
What colour is aluminium alloy flareless fittings
Green ( caused from anodizing treatment.
31
How is the material which the fittings is made from indicated on MS number ?
There is an absence of a letter or addition of a letter at end of number.
32
What’s the common repair system used for repairing hydraulic systems ?
Permaswage fittings
33
What do swaged fittings create ?
Permanent connection which is virtually maintenance free.
34
What are swaged fittings used to connect ?
Hydraulic lines in areas where routine disconnections are not required. ( used with titanium and CRES tubing )
35
How is swaged fitting installed ?
Portable hydraulic powered tool ( small enough to use in confined spaces )
36
How do you disconnect fittings on tube ?
Cut tube with tube cutter
37
How is permalite fittings attached ?
Mechanically attached by axial swaging
38
What’s a common component of a permalite fitting ?
Moving ring
39
What are flexible fluid lines constructed from ?
Synthetic compounds ( provides flexibility )
40
Where are flexible fluid lines used ?
1. Connecting moving parts to stationary parts 2. Locations subject to vibration 3. Where great amount of flexibility is needed ( sometimes use as a connector for metal tubing )
41
What components does a flexible fluid line consist of ?
1. Inner liner - carrying fluid 2. Reinforcement layer 3. Protective outer cover - protect from physical damage ( material used and manufacturing process for hose determines on application hose is used for. )
42
What’s 3 materials a inner line on flexible hose is made from ?
1. Neoprene 2. Buna-N 3. Butyl 4. Teflon - Broad operating temp of -240 degrees to 204 degrees
43
What common 3 materials can a reinforcing layer in a flexible hose be made from ?
1. Cotton 2. Steel braid 3. Carbon steel wire
44
What 2 materials can a outer cover Of a flexible hose made from ?
1. Rubber 2. Steel braid
45
What information is found on lay lines on flexible hoses ?
1. Manufacture information 2. Mil-Spec numbers 3. Indicates weather assembly is twisted when installed
46
What’s a flexible hoses inside diameter measured in ?
1/16 inch increments ( dash number indicates tube diameter ) E.G. ( a-10 )-> 10/16 of inch
47
What’s maximum operating pressure of low pressure hose ?
Up to 600psi
48
What’s maximum operating pressure of medium pressure hose ?
Up to 3000psi ( Maximum pressure depends on their diameter )
49
What is used as outer cover for medium pressure hose?
Cotton
50
What’s the maximum pressure of a high pressure flexible hose ?
Over 3000psi
51
Can swaged end fittings be removed and reused ?
No. Reusing fitting causes leakage.
52
What does a re-usable fitting consist of ?
1. Socket 2. Nipple 3. Nut
53
What has to happen prior to re-using any fittings ?
Must be removed from damaged hos and carefully inspected.
54
Should you mix components manufactured by different companies ?
No
55
What should be placed on open ends of a fluid line when removed / disconnected ?
Blanking caps, tightened with wrench to prevent leakage. ( made from plastic, wood, metal )
56
What’s the purpose of a swivel fitting ?
Allows the coupling and hose connection to rotate.
57
What’s 7 advantages of a swivel fitting ?
1. Extends hoss life 2. Reduces maintenance needed 3. Reduces length of hose needed between connections. 4. Eliminate use for bent tubing 5. Connected to hose line without adapters 6. Compensates for hose length changes. 7. Simplify hose installation
58
What 2 components does a swivel fitting consist of ?
1. Stem 2. Housing ( rotate relative to one another ) ( rotate 360 degrees )
59
What does couplings provide ?
Quick connection / disconnection capabilities with self - sealing action ( used on ground support equipment )
60
What’s 3 advantages of couplings ?
1. Offer one-hand operation 2. Self-sealing 3. Eliminate vapour loss
61
What are gamah couplings used for ?
Fuel,water,waste and oxygen systems
62
What’s the components of a gamah coupling ?
1. Aluminium sleeves 2. Clamps 3. O-rings 4. Swaged flanges
63
How can the flange swage process be carried out ?
1. Manually 2. By machine
64
What does the flange On a gamah coupling provide ?
Maximum angular movement without transferring load to clamp.
65
What does the double hinged design of clamp on gamah coupling allow ?
Eases fittings in tight spaces
66
What has to happen for gamah coupling In order to open it ?
All three paw latch locks have to be lifted
67
Where do you use v- retainer couplings ?
1. Connecting in high temp, pressure and mechanical applications. 2. Connect Bleed air ducts 3. Exhaust systems 4. Connections which are frequently put together and taken apart.
68
Fb
69
Whats the two v-couplings types ?
1. V - retainers 2. V - bands
70
What Can a t-bolt be tightened with ?
Hex-nut ( to create seal )
71
When is a t-bolt used ?
When access is limited.
72
Difference between V-retainers and V-bands ?
V-retainers have single retainer segment and v-bands have multiple.
73
Whats worm gear hose clamps ( jubilee clips ) used for ?
1. Secure hose ( made from zinc-plated steel )
74
What components make up a worm drive clamp ?
1. Slotted band 2. Screw housing 3. Worm gear 4. Screw

M6 (6 decks)

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