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Quick Connect Coupling

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Aircraft Hydraulic Hose and Hydraulic Hose Fittings [2011-04-28]

Check steel tubes for leaks, loose anchorage, scratches, kinks, or other damage. Inspect fittings and connections for leakage, looseness, cracks, burrs, or other damage. Replace or repair defective elements. ensure the hoses do not chafe against 1 an additional and so are correctly secured and clamped Quick Disconnect Coupling .

a. alternative of steel tube. When inspection shows hydraulic hose to be broken or defective replace the entire line or, when the broken part is localized, a repair part may be inserted. In replacing aircraft hose, always use tubing of the same dimension and material since the original line. Use the old tubing as a theme when bending the new tube, unless it is too significantly damaged, in which situation a theme can be created from soft metal wire. Soft aluminum tubing (1100, 3003, or 5052) under half-inch outside diameter may be bent by hand. For all other tubing use an acceptable hand or power tube-bending tool. Bend tubing very carefully to steer clear of too much flattening, kinking, or wrinkling. A small quantity of flattening in bends is acceptable, but do not exceed 75 % of the original outside diameter. too much flattening will trigger fatigue failure of the hydraulic tube. When installing the alternative tubing line it up correctly using the mating part to ensure that it is not forced into alignment by tightening of the coupling nuts.

c. Repair of aircraft hydraulic steel Tube Lines Hydraulic Qulck Coupling. Minor dents and scratches in tubing may be repaired. Scratches or nicks not deeper than 10 % of the wall thickness in aluminum alloy tubing, that are not inside heel of the bend, may be repaired by burnishing with hand tools. Replace lines with severe die marks, seams, or splits inside tube. Any crack or deformity in a flare is unacceptable and trigger for rejection. A dent lower than 20 % of the tube diameter is not objectionable unless it is inside heel of the bend. A severely-damaged line should be replaced; however, it may be repaired by slicing out the broken part and inserting a tube part of the same dimension and material. Flare the two ends of the undamaged and alternative tube sections and make the connection by making use of standard unions, sleeves, and tube nuts.If the broken portion is short enough, omit the insert tube and repair by making use of 1 union and two sets of connection hose fittings.

d.Replacement of versatile Hose. When alternative of versatile hose is necessary, use the same type, size, part number, and period of hose since the line to be replaced. Check TSO requirements. when the alternative of the hose having a swaged-end sort fitting is necessary, acquire new hydraulic hose assemblies of the correct dimension and composition. Certain synthetic oils call for a specially compounded synthetic rubber hose, that is compatible. Refer for the aircraft manufacturer's services details for the correct part number for the alternative hose. when the fittings on every finish are of the correct sort or sleeve type, a alternative may be fabricated. Before slicing new versatile cable braided hose for the proper size, tape the hose tightly with masking tape and cut inside center of the masking tape to prevent fraying. The use of the mandrel will prevent slicing the within of the hose when inserting the fittings.

(1) Teflon hose is used in several aircraft systems for the reason that it has superior qualities for certain applications. Teflon is compounded from tetrafluoroethylene resin that is unaffected by fluids generally used in aircraft. It has an working variety of -65°F to 450 °F. For these reasons, Teflon hose is used in hydraulic and engine lubricating systems where temperatures and difficulties preclude using rubber hose. even though Teflon hose has excellent performance qualities, it also has peculiar qualities that call for added treatment in handling. It tends to presume a permanent set when subjected to high pressure or temperature. Do not try to straighten a hose that has been in service. Any too much bending or twisting may trigger kinking or weakening of the tubing wall. Replace any hose that shows signs of leakage, abrasion, or kinking. Any hose suspected of kinking may be checked having a steel ball of proper size.The ball will not pass through when the hose is distorted past limits.

(2) when the hose fittings are of the reusable type, a alternative hose may be fabricated. When a hose assembly is removed, the ends should be tied, to ensure that the preformed form will be maintained.

(3) All versatile hose installations should be supported at least every 24 inches. Closer supports are preferred. They should be very carefully routed and securely clamped to steer clear of abrasion, kinking, or too much flexing. too much flexing may trigger weakening of the hose or loosening in the fittings.