M6.6 Flashcards
Pressures over 1500 PSI (105 bar)?
High
Under 1500 PSI (105 bar)?
Medium
Suction and return lines?
- low pressure lines
A flared tube consists of?
- Sleeve
- Flared nut
Aircraft fittings have a flare angle of?
37*
Flared tube fittings are identified by either?
- AN army & navy (blue/black)
- AC air cops (grey/yellow)
Size of rigid tubing is determined by?
-outside diameter in increments of 1/8inch
-part numbers marked in 1/16 inch increments
Why is double flare better than single flare?
- smoother
- more concentric
- provides better seal
- more durable
- resistant to shearing effect of torque
What are flared-tube fittings made of?
- aluminium alloy
- steel
- copper-based alloys
What are flareless tubes?
-attach 2 sections of pipe together which would have ferrules or a sleeve
-when tightened, ferrule/sleeve is compressed between nut
-creates a strong leak free joint
Fitting consists of 3 parts?
-Tube
-Sleeve
-nut
What is a swaged fitting?
- permanent connection that is maintenance free
-used where routine disconnections are not required
What are permalite fittings?
-deforming fitting into the tube that is joined by moving a ring/component axially.
Why would you use a flexible fluid line?
-vibration
-moving parts
What are the 4 synthetic compounds used in the construction of the inner liner?
-Neoprene
-Buna-N
-Butyl
-Teflon
Neoprene is suitable for?
Petroleum-based fluids
Buna-N is suitable for?
-Petroleum based products (better than neoprene)
Butyl is suitable for?
Phosphate ester-base hydraulic fluids (e.g. skydrol)
Teflon is suitable for?
-compatible with nearly every liquid used
- Broad temp range (-240c to 240c)
Size of flexible hose is determined by?
-inside diameter and measured in increments of 1/16 inch
Up to 4000kPa (600psi) on a flexible hose?
Low pressure
Up to 20000kPa (3000psi) on a flexible hose?
- medium pressure
Over 20000kPa (3000psi) on a flexible hose?
High pressure
Can you re-use swaged fittings?
No
Is it a requirement that open ends of fittings are covered during fluid line disconnections?
True
What are swivel fittings?
-Allows coupling and hose connection to rotate (flexibility)
-prevents twisting and excessive bending
Advantage of a quick disconnect coupling?
- one hand operation
- quick to operate
-help eliminate vapour loss + other hazards
What are Gamah couplings?
- lightweight and flexible couplings for aerospace fuel, environmental control, water, waste and oxygen systems
What are v-retainer couplings?
- connect ducting, tubing and other components in high temp and high pneumatic pressure areas
Advantages of v-retainer couplings?
-inexpensive
- fasten with only 1 or 2 bolts
What are the 2 types of v-couplings?
- V-bands
- v-retainers
What are worm gear hose clamps (jubilee clips)?
- clamps that secure a hose while remaining connected to a fitting
Pre made pipe identification are marked with: (T or F)
- part number
- drawing number
- Inspection stamp
- test stamp
- date of manufacturer
How are flared tubings identified?
- AN - army/navy
- AC - Air Corps
