aircraft hydraulic hoses and hydraulic hose fittings

by:Lepu     2019-12-16
Carefully check all hydraulic hoses and accessories on a regular basis to ensure airworthiness.Investigate any signs of liquid loss or leakage.Check for water leakage of metal pipes, loose ground feet, scratches, kinks or other damage.
Check for leaks, looseness, cracks, burrs or other damage to the fittings and connections.Replace or repair defective items.Make sure the hose does not chew with each other and fix and clamp properly.a.Replace the metal tube.When checking whether the hydraulic hose is broken or damaged, the whole line can be replaced or repaired if it is partially damaged.
Replace the air hose and always use tubes of uniform size and material as the main line.Use the old tube as the template for the bending of the new tube, unless he is too corrupt, the template can be made with soft wire.Soft aluminum tube of 1100, 3003, 5052, outer diameter less than half inch, can be bent by hand.
For all other uses acceptable for manual or electrical tubes-bending tool.Be careful to bend the pipe to avoid excessive bending or wrinkle.A small amount of flattening of the curve is acceptable, but should not exceed 75% of the initial outer diameter.
Excessive flattening will cause fatigue failure of the hydraulic pipeline.The correct installation of the replacement line with the fit part is that he is not forced to align according to the tightening nut.b.Hose joint and pipe joint.Standard communication equipment :-818 (20818 MS) and nuts-819 sleeves (20819 MS ).
Rocket selection, square cutting of tube end, smooth shell, remove all burrs and sharp edges and clean thoroughly.Then use the correct 37-degree flare-Manufacture Tool air pipe and type and size of installation.Double lighting for soft aluminum tube 3/8-The outer and lower diameters of inches, and the deterioration of all other pipes.
Connection for using hydraulic fluid as lubricant and tightening.Excessive tightening can cause failure by damaging the pipe or fittings.Under-Tightening can cause leakage, resulting in a system failure.
Warning: incorrect use 45-Degree parking-The arrangement may result in incorrect shape and angle of the pipe torch due to inappropriate, stress and strain and possible failure of the system.c.Maintenance of hydraulic metal pipeline for aircraft.Small dents and scratches in the tube can be repaired.
No scratches or scratches exceeding 10% of the wall thickness of the aluminum tube, not located on the curved heel, can be carried out according to the polishing of the hand tool.Change the line with severe mold marks, seams or pipe breaks.Any crack or deformation of the torch is unacceptable and can lead to rejection.
Dents less than 20% of the diameter of the pipe are not objectionable, unless carried out on a curved heel.Very damaged lines should be replaced, but can be repaired by cutting the damaged parts and inserting pipe sections of the same size and material.Separate both ends and replacements of damaged pipe segments with standard joints, sleeves and tube nuts and establish connections.
If the damaged part is short enough, skip the insert tube and repair it with a connection of one joint and two hose fittings.d.Replace the hose.In the case of the need to use hoses of the same type, size, quantity and length, the hose needs to be replaced.Maybe it\'s the WHO request.If a replacement hose swivel end of the type of installation is required, a new hydraulic hose assembly suitable for size and composition is obtained.
Some products require synthetic oil, especially synthetic rubber hoses.Please refer to the aircraft manufacturer service information in the replacement hose right part number.If the full details of the coupling for each correct type, or the type that can be modified.
Before cutting the new soft wire woven hose to the right size, fix the hose with masking tape and masking tape to prevent the wear center.The shaft from the core will help prevent cutting the hose into the fitting inside.Install hose assembly without rotation.The hose should be stretched tight between the two fittings as this will result in serious and possible failure.
The hose length should be sufficient for about 5 to 8% of dust.Avoid the tight bending of the curved lines as they can be damaged.The minimum bending radius shall not be exceeded.
(1) the Teflon hose is used in many aircraft engines because it has high quality in some applications.Teflon is a kind of TPE resin that does not affect the fluid commonly used on aircraft.Its scope of operation is-65 degrees Fahrenheit to 450 degrees Fahrenheit.
For these reasons, Teflon hoses are used in hydraulic and engine lubrication systems where temperature and pressure exclude the use of rubber hoses.While the Teflon hose has excellent performance features, it also has unique features that require additional care management.When it is exposed to high pressure and temperature, it tends to assume a permanent setting.
Do not try to straighten out the hose that is put into use.Any excessive bending or distortion will cause the pipe wall to twist or weaken.Replace the hose with signs of leakage, friction or kinking.
However, suspicious twist hose can be checked by steel balls of the appropriate size.Will not twist the ball provided through the hose to the limit.(2) the hose may be replaced if the hose fitting is of a reusable type.
When removing the suction hose, the end should be tied to keep the prefabricated shape.(3) each hose unit shall be supported at least 24 cm.Strengthen support.They must be wired carefully and securely clamped to prevent wear, Kinks, or bending.
Excessive bending can lead to weakening or loosening of hose fittings
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