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M6 > 6.6- Pipes and Unions > Flashcards

6.6- Pipes and Unions Flashcards

1
Q

What does a tube assembly consist of

A

The tube and tube fittings

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2
Q

What are the dimensions determined by

A

Their dimensions are determined by the external diameter 1/8 inch increments and wall thickness

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3
Q

What pressures are high and low lines and what is the third type.

A

High lines are over 1500psi
Low pressure lines are below 1500psi
Suction and return are the third type

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4
Q

What lines must be made of steel

A

Lines in the engine area, where there is a danger of fire, and in the landing gear area, where there is a danger of being hit by stones

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5
Q

Why are titanium lines an exception

A

Due to reasons of weight

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6
Q

What items of information are stencilled on the pipe or surface stamped

A

Drawing or part number, inspection stamp,test stamp and date of manufacture

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7
Q

What is the name for the c de system and how does it work

A

ATA100
The system
The component it is fitted to
The subsystem to which the pipe is fitted
Whether it is a suction, pressure or return line

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8
Q

If you saw phdan what would this mean

A

Pipelines with physically dangerous contents, due to temperature, noxious, corrosive etc.

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9
Q

How do flareless fittings achieve their seal

A

Ball bush principle

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10
Q

Describe an MS fitting

A

The sleeve of malleable steel is shaped by pre stressing in such a way that it’s inner cutting edge is pushed over the pipe to seal it. The tube must, in principle, be on the stop support

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11
Q

Name some key things about a Harrison fitting

A

Ball Bush fitting
Tube is moulded, in that it is swaged in sleeve for a tight seal.
Ease of handling and simple tools for installation
Thin walled tubes and almost totally vibration resistant

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12
Q

Permaswage fitting

A 
Repair fitting for damaged pipes
Steel sleeve is squeezed onto the prepared pipe End with a hydraulically driven tool
Quickly in situ
Light and gives a good seal
Cannot be separated
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13
Q

For a flare type fitting to work what must the surfaces be

A

Scrupulously clean and free of cracks, scratches and nicks etc

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14
Q

Flare angles for aircraft fittings and vehicle type fittings

A

Aircraft have a angle of 37.

Vehicle type have an angle of 45.

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15
Q

Leak inspection

A

If a leak is apparent from a correctly tightened joint, it should be dismantled and mating surfaces thoroughly inspected for damage or debris.

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16
Q

What mustn’t you do in attempt to fix a leak

A

Over tighten the joint

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17
Q

What are two types of flare

A

Single and double

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18
Q

What types of single flare are there and what is special about them

A

Impact type- 37 angle at hydraulic tube end to ensure an effective single seal point between the nose of the triple lok flared tube fitting and the tube
Roll type- preferred method with an entirely self contained unit producing a good flare. No hammering required

19
Q

Describe the double flare

A

Soft aluminium tubing
Outside diameter of 3/8 inch or smaller
Smoother and more concentric = better seal
More durable

20
Q

Name and describe tube damage types

A

Sharp bottomed surface defect- loss of material where the damage cuts into the material to form a sharp edge at the deepest point e.g. scratch
Round bottom- defined as damage with loss of material, although the damage on the bottom is not sharp edged e.g. abrasion points
Round bottom impact- dent in the tube walling

21
Q

When is damage not permitted

A

When it isn’t in the manual

22
Q

General information about hoses

A

Must be certain amount of slack, between 2 and 4%

Twisted hoses have a shortened life

23
Q

When are hoses used

A

Connect stationary to moving parts in areas of high vibration

24
Q

What are the three types of hose ratings and what are their values

A

Low pressure- up to 600psi
Medium pressure- up to 3000 psi
High pressure- above 3000 psi

25
Q

What is a lay line

A

Indicate whether assembly is twisted or not

26
Q

What does the manufacturers hose identification refer to

A

Specification number, hose size and length in inches or feet

27
Q

Key factors in the construction of hoses

A

Inner layer carries all the fluid and must be therefore compatible chemically.
Protective outer cover is usually made from rubber impregnated fabric

28
Q

Name some of the four main compounds used to construct inner liners

A

Neoprene-petroleum fluids
Buna-N- better suited for petroleum fluids
Butyl- skydrol
Teflon- almost all fluids

29
Q

Name some of the reinforcement layers

A 
Cotton
Rayon
Polyester fabric
Carbon steel wire
Stainless steel wire braid
30
Q

Describe the inspection of hoses

A

Should be inspected for deterioration
Attention should be paid to indication of leakage and mechanical damage.
Damage limits will be found in AMM

31
Q

How do you clean and test a re usable fitting

A

It must be cleaned out with compressed air from both directions and then proof tested (normally 1 1/2 times working pressure) by capping one end

32
Q

What checks should be carried out before installing a flexible hose

A 
Applicability 
Length
Cleanliness
Damage
Check tag for- part no., cure date and assembly date
33
Q

When installing a hose what must you ensure

A 
Not to twist it
Subject to minimum flexing
Supported at least every 24 inches
Not stretched to tightly 
Minimum bend radius observed
34
Q

Break down and explain the part number M 8794-10-096-6

A

8794- specification number
10- Hose size
096- length in inches or feet
6- Fractional lengths in 1/8 increments

35
Q

It is possible to replace a short bend radius with an elbow fitting but what is still preferred

A

Largest possible bend radius

36
Q

What are protective sleeves most commonly made out of

A

Heat shrink
Nylon spiral wrap
Teflon

37
Q

What used to contain asbestos in it’s early products

A

Fire sleeves so take care when removing them.

38
Q

What two fittings are used in aircraft

A 
Standard MS (flareless) and AN (flared) fittings
Flareless have a 24 angle
39
Q

What do MS21900-8
MS21900-8-D
MS21900-8-S
represent?

A

8= Carbon steel

  • 8-D= Aluminium Alloy
  • 8-S= CRES
40
Q

Break down the AN part number AN816-5-3D

A 
5= tube diameter 5/16
3= Thread diameter 3/8
D= material
41
Q

What flared fitting parts still exist other than AN and MS

A

AC

42
Q

Describe some key features of quick disconnect couplings as fuel fittings.

A

Ease and speed

Eliminate vapour loss

43
Q

Name the different types of fuel fittings

A 
Screw type
Instomatic push pull type
Quick threading indicating type
Full grip push pull type
Straight flow ball valve type 
Ball lock type

M6 (14 decks)

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