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Fluid Lines and Fittings
FAA-H chapter 7 General study guide questions 8192 – 8218 AC B
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Fluid Lines Fluid lines are made of metal tubing (rigid lines) or flexible hose. Rigid lines for stationary applications Aluminum for lower pressures Stainless steel (CRS) for high pressure applications Flex lines for items with relative motion between them. Hose material depends on fluid type and pressure
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Metal Tubing Sized by OD in 1/16 inch increments
A -4 hose or fitting is 4/16 or 1/4 -6 is 6/16 or 3/8 -8 is 8/16 or 1/2 Cut to 10% larger Use special cutting tool Use a deburring tool after cutting Either single or double flare Flared to a 37 degree angle Not the same as automotive which is 35
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Metal Tubing Lines marked with 1 inch tape or decals
At both ends of the line and in each compartment it passes thru Tubing should always have at least one bend in it to absorb vibrations, expansion and contraction during operation
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Fittings for Flared Tubing
2 piece AN818 nut and AN819 sleeve Do not pull fitting into place with nut Always use same alloy fittings Do not overtighten, damage to flare will occur Tighten till snug then one sixth turn About on flat on the hex nut
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Fittings for MS Flareless Fittings
Three parts Body, sleeve and nut The body and sleeve to cut into the tube when joined. Overtightening will damage the tube
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Damage to Tubing Any damage to the flare is unacceptable
Damage in the heel of the bend is usually not acceptable Scratches or nicks by be repaired by burnishing with hand tools
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Flexible Fluid Lines AC 4313 pg 9-18
Most common materials used for construction of hoses are; Buna-N Neoprene Butyl Ethylene Propylene Diene Rubber (EPDM) Teflon
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Flexible Fluid Lines Butyl Teflon
Used with phosphate ester based fluid such as SKYDROL Never use with petroleum products Five digit code for identification Also used to identify if the hose is twisted during install Teflon Great operating range Can handle a broad range of fluids Permanent set, (cold flow) never straighten
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Flexible Fluid Lines Size corresponds to the outside diameter of rigid lines. The ID of a hose is the same as the OD of a rigid line 5% to 8% slack Install without twisting (lay line) Watch minimum bend radius (43.13 fig 9-10)
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