7.9

Question 1

How are the dimensions determined

Answer 1

External diameter
Wall thickness

Question 2

What increments are the dimensions in

Answer 2

1/8

Question 3

What metal should you use in areas of high pressure of chance of impact

Answer 3

Steel (landing gear, fire proof needed areas)

Question 4

What are the pressure for a rigid pipe

Answer 4

Low pressure = suction and return line
Medium = up to 1500psi
High = over 1500psi

Question 5

What are the medium and low pipes made from

Answer 5

Aluminium alloy

Question 6

What is the bend radius dependent on

Answer 6

Material type
Wall thickness
Outer diameter

Question 7

How to you clean and proof test a pipe

Answer 7

Cleaned by compressed air
Then proof tested by 1 1/2 times working pressure with end cap on.
Only by specialist

Question 8

When installing a bonded clamp what must you ensure

Answer 8

Any paint or anodising is removed from where clamp is fitted for electrical continuity

Question 9

What do flareless fittings rely on

Answer 9

Ball bush principle

Question 10

What are the two types of flareless fitting and which one is preferred

Answer 10

Ms
Harrison - preferred

Question 11

Why is Harrison preferred

Answer 11

Ease of fitting
Vibration resistant

Question 12

What is the angle of a flared fitting

Answer 12

37 degrees

Question 13

What should you not do if you suspect a leak

Answer 13

Over tighten it

Question 14

What are the two types of flares

Answer 14

Single
Double

Question 15

How can you from a single flare fitting and which one is preferred

Answer 15

Impact
Roller - preferred

Question 16

What are the characteristics of an AN fitting

Answer 16

37
Recess
Coarse
Blue/black
Longer

Question 17

What are the characteristics of an AC fitting

Answer 17

35
No recess
Fine
Grey/yellow
Shorter

Question 18

What should you use a double flare on

Answer 18

Aluminium 3/8 or smaller

Question 19

What is better about a double flare

Answer 19

Gives a smoother more concentric seek

Question 20

What are the advantages of a permaswage fitting

Answer 20

In situ
Quick and easy
Tight seel

Question 21

What are the disadvantages of a permaswage fitting

Answer 21

Once it’s in can it be removed

Question 22

What should you do before bending a radius

Answer 22

Lubricate the bending point

Question 23

What can aluminium alloy be repaired with if absolutely necessary

Answer 23

Titanium alloy tube

Question 24

What can titanium alloy be repaired with if absolutely necessary and what do you have to take into consideration

Answer 24

CRES tube
Weight penalty

Question 25

If there is a 5% wall defected what’s it called

Answer 25

Sharp bottom

Question 26

If there is a10% wall defected what’s it called

Answer 26

Round bottom

Question 27

What are the pressures of hoses

Answer 27

Low = up to 600psi Med = up to 3000psi High = over 3000psi

Question 28

What do lay lines do and what colours are they

Answer 28

Indicate twisting Red, yellow, white

Question 29

What is the name of the reusable fitting

Answer 29

Aeroquip

Question 30

What should you do before installation

Answer 30

Cleanliness Damage Applicability Length

Question 31

At what length should the hose be supported

Answer 31

Ever 24 inches

Question 32

What can you do if the bend radius is too short

Answer 32

Replace the bend radius with a elbow bend fitting

Question 33

What is the best protective sleeve and why

Answer 33

Teflon Because it is compatible with most things

Question 34

How can you detect slippage

Answer 34

By witness marks after it has been torqued