6.6 Flashcards
Where are flexible hoses generally used?
With moving parts or hose is subjected to vibration
(Landing gear typicaly use both)
Why was copper tubing stopped being use in early aircraft?
Became hard or brittle from vibration
Ridgid tubing is used in stationary applications and long straight runs what systems typically use rigid tubing?
Fuel, oil, oxygen and some instrument systems
What systems do aircraft landing gear use?
And why?
Both types rigid because of durability of metal and flexible for the gear extension and retraction
What does a rigid fluid line assembly consist of?
The tube and both tube fittings
How are rigid fluid lines dimensions determined and what are increments do wall thickness go up?
Rigid tubing is measured by its external diameter and goes by 1/8 inch increments
If the material quality is higher what same pressure can be achieved with a loss of?
Wall thickness material can be reduced since the material is stronger
What material over aluminium is being used for fluid lines since it allows greater operating _____ and longer ________ _______?
Steel fluid lines
Operating saftey
Longer life expectancy
What is the pressure/use of High, Medium and low pressure lines?
High- Over 1500 PSI
Medium- Up to 1500 PSI
Low- Suction and return lines.
What material are medium and low pressure fluid lines preferably made of for weight saving?
Aluminium alloys
Fluid lines near engines in danger of fire and landing gear danger of stones must be made of what?
And what is the substitution and why?
Steel
Or Titanium for weight saving
What must fluid lines match and be free of so they maintained there necessary seal over longer operating periods?
Must match their axis and be free of tension.
Neoprene pipes is suitable for what?
Petroleum based fluids
Aircraft fittings have a flare angle of?
Automotive is?
37 degrees (aircraft)
45 degrees (Automotive)
What is Butyl suitable for?
Hydraulic fluid (e.g skydrol)
What is a swaged fitting
And how do you take it out
Permanent fitting line used where quick disconnect are not required
Cut it out to remove
What is a swivel fitting
A fitting that allows flexability and movement
What increments is rigid tubing and flex tubing measured in?
Rigid- 1/8
Flex- 1/16
What 2 methods can pipes be marked?
Stencilled or surface ink stamp
What colour is 1100 aluminium alloy?
White
What colour is 3003 aluminium alloy?
Green
What colour is 2014 aluminium alloy?
Grey
What colour is 2024 aluminium alloy?
Red
What colour is 5052 aluminium alloy?
Purple
