Plane Hydraulic Hose and Hydraulic Hose Fittings - 0 views

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  #1 Chet Drew on 26 Jun 12

   

  Very carefully inspect all hydraulic hose and fittings at typical intervals to guarantee airworthiness. Examine any proof of fluid reduction or leaks. Check steel tubes for leaks, loose anchorage, scratches, kinks, or other damage. Examine fittings and connections for leakage, looseness, cracks, burrs, or other damage. Substitute or fix defective aspects. Make certain the hoses do not chafe towards 1 one more and are appropriately secured and clamped.
  
  a. Replacement of Steel tube. When inspection shows hydraulic hose to be harmed or faulty replace the whole line or, if the ruined section is localized, a maintenance section might be inserted. In changing plane hose, constantly use tubing of the identical measurement and material as the authentic line. Use the old tubing as a template when bending the new tube, except if it is way too drastically harmed, in which circumstance a template can be produced from gentle iron wire. Delicate aluminum tubing (1100, 3003, or 5052) under fifty percent-inch outdoors diameter may possibly be bent by hand. For all other tubing use an appropriate hand or electricity tube-bending device. Bend tubing carefully to steer clear of extreme flattening, kinking, or wrinkling. A small volume of flattening in bends is satisfactory, but do not exceed seventy five p.c of the original outside the house diameter. Abnormal flattening will lead to tiredness failure of the hydraulic tube. When putting in the substitution tubing line it up correctly with the mating component so that it is not compelled into alignment by tightening of the coupling nuts.
  
  b. Hose couplings and Tube Connections. Many tube connections are manufactured utilizing flared tube stops with
  standard link fittings: AN-818 (MS 20818) nut and AN-819 (MS 20819) sleeve. In forming flares, minimize the tube stops square, file easy, remove all burrs and sharp edges, and carefully clean. The tubing is then flared using the correct 37-degree aviation flare forming device for the measurement of tubing and type of fitting. A double flare is utilized on comfortable aluminum tubing three/8-inch outdoors diameter and underneath, and a single flare on all other tubing. In creating the connections, use hydraulic fluid as a lubricant and then tighten. Overtightening will injury the tube or fitting, which might lead to a failure. Underneath-tightening may possibly lead to leakage which could end result in a technique failure.
  
  CAUTION: Mistaken use of forty five-diploma automotive flare forming resources may possibly end result in improper tubing flare form and angle triggering misfit, pressure and strain, and probable system failure.
  
  do. Fix of aircraft hydraulic Metal Tube Lines. Minimal dents and scratches in tubing may be repaired. Scratches or nicks not deeper than ten percent of the wall thickness in aluminum alloy tubing, that are not in the heel of a bend, might be fixed by burnishing with hand instruments. Substitute lines with extreme die marks, seams, or splits in the tube. Any crack or deformity in a flare is unacceptable and cause for rejection. A dent much less than twenty percent of the tube diameter is not objectionable except if it is in the heel of a bend. A severely-ruined line must be replaced even so, it may possibly be fixed by cutting out the damaged segment and inserting a tube section of the exact same dimensions and materials. Flare the two ends of the undamaged and replacement tube sections and make the connection by utilizing normal unions, sleeves, and tube nuts.If the damaged part is brief adequate, omit the insert tube and repair by utilizing a single union and two sets of link hose fittings.
  
  d.Alternative of Flexible Hose. When replacement of flexible hose is necessary, use the exact same variety, measurement, element amount, and length of hose as the line to be changed. Check TSO requirements. If the replacement of a hose with a swaged-end sort fitting is necessary, get new hydraulic hose assemblies of the right dimension and composition. Specific synthetic oils require a specially compounded artificial rubber hose, which is compatible. Refer to the aircraft manufacturer's service data for the right portion variety for the replacement hose. If the fittings on every single end are of the proper type or sleeve sort, a substitute may be fabricated. Before reducing new versatile wire braided hose to the suitable dimension, tape the hose tightly with masking tape and lower in the heart of the masking tape to avert fraying. The use of a mandrel will prevent cutting the within of the hose when inserting the fittings. Set up hose assemblies without having twisting. A hose must not be stretched tight between two fittings as this will consequence in overstressing and eventual failure. The duration of hose ought to be enough to provide about five to eight % slack. Stay away from restricted bends in flex lines as they might consequence in failure. By no means exceed the minimum bend radii.
  
  (one)Teflon hose is used in many aircraft techniques since it has exceptional traits for certain applications. Teflon is compounded from tetrafluoroethylene resin which is unaffected by fluids typically utilized in aircraft. It has an functioning variety of -65°F to 450 °F. For these causes, Teflon hose is utilised in hydraulic and engine lubricating techniques exactly where temperatures and pressures preclude the use of rubber hose. Although Teflon hose has exceptional performance qualities, it also has peculiar qualities that require added care in handling. It tends to believe a long term established when uncovered to large strain or temperature. Do not attempt to straighten a hose that has been in support. Any excessive bending or twisting may possibly lead to kinking or weakening of the tubing wall. Replace any hose that exhibits indications of leakage, abrasion, or kinking. Any hose suspected of kinking may be checked with a metal ball of proper dimension.The ball will not move by way of if the hose is distorted outside of limitations.
  
  (two)If the hose fittings are of the reusable type, a substitute hose may be fabricated. When a hose assembly is taken out, the stops must be tied, so that the preformed form will be managed.
  
  (3)All versatile hose installations really should be supported at least each 24 inches. Closer supports are desired. They must be cautiously routed and securely clamped to stay away from abrasion, kinking, or excessive flexing. Extreme flexing might cause weakening of the hose or loosening at the fittings.
  
  
  
  REFERENCES:
  
  http://www.afreearticle.com/Art/169903/211/Several-Benefits-of-the-Teflon-Fuel-Hose.html
  
  http://www.articlecell.com/Article/Many-Perks-of-the-Teflon-Fuel-Hose/1565013
  
  http://www.article-mania.com/articledetail.php?artid=775229&title=Teflon-Fuel-Hose-And-Its-Many-Advantages

   

  <div class="cArrow"> </div><div class="cContentInner">Very carefully inspect all hydraulic hose and fittings at typical intervals to guarantee airworthiness. Examine any proof of fluid reduction or leaks. Check steel tubes for leaks, loose anchorage, scratches, kinks, or other damage. Examine fittings and connections for leakage, looseness, cracks, burrs, or other damage. Substitute or fix defective aspects. Make certain the hoses do not chafe towards 1 one more and are appropriately secured and clamped.<br /><br />a. Replacement of Steel tube. When inspection shows hydraulic hose to be harmed or faulty replace the whole line or, if the ruined section is localized, a maintenance section might be inserted. In changing plane hose, constantly use tubing of the identical measurement and material as the authentic line. Use the old tubing as a template when bending the new tube, except if it is way too drastically harmed, in which circumstance a template can be produced from gentle iron wire. Delicate aluminum tubing (1100, 3003, or 5052) under fifty percent-inch outdoors diameter may possibly be bent by hand. For all other tubing use an appropriate hand or electricity tube-bending device. Bend tubing carefully to steer clear of extreme flattening, kinking, or wrinkling. A small volume of flattening in bends is satisfactory, but do not exceed seventy five p.c of the original outside the house diameter. Abnormal flattening will lead to tiredness failure of the hydraulic tube. When putting in the substitution tubing line it up correctly with the mating component so that it is not compelled into alignment by tightening of the coupling nuts.<br /><br />b. Hose couplings and Tube Connections. Many tube connections are manufactured utilizing flared tube stops with<br />standard link fittings: AN-818 (MS 20818) nut and AN-819 (MS 20819) sleeve. In forming flares, minimize the tube stops square, file easy, remove all burrs and sharp edges, and carefully clean. The tubing is then flared using the correct 37-degree aviation flare forming device for the measurement of tubing and type of fitting. A double flare is utilized on comfortable aluminum tubing three/8-inch outdoors diameter and underneath, and a single flare on all other tubing. In creating the connections, use hydraulic fluid as a lubricant and then tighten. Overtightening will injury the tube or fitting, which might lead to a failure. Underneath-tightening may possibly lead to leakage which could end result in a technique failure.<br /><br />CAUTION: Mistaken use of forty five-diploma automotive flare forming resources may possibly end result in improper tubing flare form and angle triggering misfit, pressure and strain, and probable system failure.<br /><br />do. Fix of aircraft hydraulic Metal Tube Lines. Minimal dents and scratches in tubing may be repaired. Scratches or nicks not deeper than ten percent of the wall thickness in aluminum alloy tubing, that are not in the heel of a bend, might be fixed by burnishing with hand instruments. Substitute lines with extreme die marks, seams, or splits in the tube. Any crack or deformity in a flare is unacceptable and cause for rejection. A dent much less than twenty percent of the tube diameter is not objectionable except if it is in the heel of a bend. A severely-ruined line must be replaced even so, it may possibly be fixed by cutting out the damaged segment and inserting a tube section of the exact same dimensions and materials. Flare the two ends of the undamaged and replacement tube sections and make the connection by utilizing normal unions, sleeves, and tube nuts.If the damaged part is brief adequate, omit the insert tube and repair by utilizing a single union and two sets of link hose fittings.<br /><br />d.Alternative of Flexible Hose. When replacement of flexible hose is necessary, use the exact same variety, measurement, element amount, and length of hose as the line to be changed. Check TSO requirements. If the replacement of a hose with a swaged-end sort fitting is necessary, get new hydraulic hose assemblies of the right dimension and composition. Specific synthetic oils require a specially compounded artificial rubber hose, which is compatible. Refer to the aircraft manufacturer's service data for the right portion variety for the replacement hose. If the fittings on every single end are of the proper type or sleeve sort, a substitute may be fabricated. Before reducing new versatile wire braided hose to the suitable dimension, tape the hose tightly with masking tape and lower in the heart of the masking tape to avert fraying. The use of a mandrel will prevent cutting the within of the hose when inserting the fittings. Set up hose assemblies without having twisting. A hose must not be stretched tight between two fittings as this will consequence in overstressing and eventual failure. The duration of hose ought to be enough to provide about five to eight % slack. Stay away from restricted bends in flex lines as they might consequence in failure. By no means exceed the minimum bend radii.<br /><br />(one)Teflon hose is used in many aircraft techniques since it has exceptional traits for certain applications. Teflon is compounded from tetrafluoroethylene resin which is unaffected by fluids typically utilized in aircraft. It has an functioning variety of -65°F to 450 °F. For these causes, Teflon hose is utilised in hydraulic and engine lubricating techniques exactly where temperatures and pressures preclude the use of rubber hose. Although Teflon hose has exceptional performance qualities, it also has peculiar qualities that require added care in handling. It tends to believe a long term established when uncovered to large strain or temperature. Do not attempt to straighten a hose that has been in support. Any excessive bending or twisting may possibly lead to kinking or weakening of the tubing wall. Replace any hose that exhibits indications of leakage, abrasion, or kinking. Any hose suspected of kinking may be checked with a metal ball of proper dimension.The ball will not move by way of if the hose is distorted outside of limitations.<br /><br />(two)If the hose fittings are of the reusable type, a substitute hose may be fabricated. When a hose assembly is taken out, the stops must be tied, so that the preformed form will be managed.<br /><br />(3)All versatile hose installations really should be supported at least each 24 inches. Closer supports are desired. They must be cautiously routed and securely clamped to stay away from abrasion, kinking, or excessive flexing. Extreme flexing might cause weakening of the hose or loosening at the fittings.<br /><br /><br /><br />REFERENCES:<br /><br /><a rel="nofollow" href="http://www.afreearticle.com/Art/169903/211/Several-Benefits-of-the-Teflon-Fuel-Hose.html">http://www.afreearticle.com/Art/169903/211/Several-Benefits-of-the-Teflon-Fuel-Hose.html</a><br /><br /><a rel="nofollow" href="http://www.articlecell.com/Article/Many-Perks-of-the-Teflon-Fuel-Hose/1565013">http://www.articlecell.com/Article/Many-Perks-of-the-Teflon-Fuel-Hose/1565013</a><br /><br /><a rel="nofollow" href="http://www.article-mania.com/articledetail.php?artid=775229&title=Teflon-Fuel-Hose-And-Its-Many-Advantages">http://www.article-mania.com/articledetail.php?artid=775229&title=Teflon-Fuel-Hose-And-Its-Many-Advantages</a></div>

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