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What are flexible hoses used for in aircraft?
Aircraft fluid systems
What do flexible hoses in aircraft fluid systems do? (3)
Connect moving and stationary parts
Accommodate vibration
Provide flexibility where needed
What can flexible hose fluid lines serve as in metal tubing systems?
Connectors
What the five common hose materials
Buna-N
Neoprene
Butyl
EPDM
Teflon
Which material is never used in the construction of flexible fluid lines?
Pure rubber
What is Buna-N resistant to?
Petroleum products
Which hydraulic fluid should you never use for Buna-N?
Skydrol
What is neoprene resistance to? (2)
Abrasion
Petroleum
Is Neoprene or Buna-N better for petroleum resistance.
Buna-N
Which hydraulic fluid should you never use for Neoprene?
Skydrol
What is Butyl made to be used with?
Skydrol
What should you never use Butyl with?
Petroleum
What is the innter tube structure of a hose made out of?
Seamless synthetic rubber
What is the inner tube structure of the hose covered with?
Layers of cotton braid and wire braid
What is the outer layer of a hose made out of?
Rubber-impregnated cotton braid
What are hoses normally classified by?
Amount of pressure they are designed to withstand
What are the three pressure classification?
Low pressure
Medium pressure
High pressure
What PSI is low pressure?
<250 psi
What reinforcement does low pressure hoses use?
Fabric braid reinforcement
What is the PSI of medium pressure small sized hose?
3000 PSI
What is the PSI of medium pressure larger sized hose?
1500
How are medium pressure hoses reinforced?
One wire braid
What is the PSI of high pressure hoses?
Up to 3000 PSI