TM 1-1500-204-23-1(4)Check valves.Replace all faulty checkvalves as complete units. Check valves cannot berepaired.WARNINGDo not use masking tape to sealopenings in oxygen regulators. Itsuse on either serviceable orrepairable oxygen equipmentconstitutes a safety hazard(5)Regulators. Do not apply oil or grease toany part of an oxygen regulator.(6)Flexible hose.Maintain flexible hose usingthe following procedures(a)To remove contamination other thanoil and grease from flexible hose, remove hose and cleanwith mild soap, A-A-50, and warm water solution,thoroughly rinse with fresh water and thoroughly dry with astream of clean, dried, water-pumped air or nitrogen(b)Replace hoses damaged orcontaminated with oil or grease. Repair and replacementprocedures for flexible hose are outlined in TM 1-1500-204-23-2.(c)Examine fittings for tightness.(7)Open lines.Plug or cap all open lines andequipment when opening system for replacement of anypart When system has been accidentally left open,system will be purged by one of the following methods•In aircraft having filler lines connected to oneend of cylinder, and distribution lines connectedto opposite ends of cylinder, purging will beaccomplished by connecting a service trailer toaircraft filler valve With all regulators open,pass oxygen through system for at least 30minutes at a pressure of 50 psi at filler valve•In aircraft having filler lines and distributionlines commonly connected at one end ofcylinder, purging will be accomplished by fillingsystem with oxygen and then draining systemThis cycle shall be performed at least threetimes.(8)Charging after flight. Charge oxygensystem on aircraft that have had all the oxygen supplydrained during flight within two hours after landing. Whenoxygen system is not charged within two hours afterlanding, system will be purged.NOTE•Do not use lubricant other thanantiseize tape, MIL-T-27730, onaircraft oxygen systems•Do not use cleaning solutions, orany other solutions, inside anypart of oxygen system whenInstalled in aircraft.•Do not use any gases other thanoxygen Inside any part of oxygensystem when Installed in aircraft.c.Servicing of Oxygen Systems. Prior to servicingan aircraft oxygen system, personnel shall familiarizethemselves with the system, precautions, and instructionsfor handling gaseous oxygen, operation of servicingequipment, and potential hazards involved. Oxygenservicing requires the utmost precautionary measures dueto the highly explosive and flammable capabilities ofoxygen All personnel shall heed the followingprecautionary procedures when servicing:CAUTIONOnly qualified personnel shall beauthorized to operate equipment forservicing of an aircraft oxygen systemDamage to equipment may otherwiseresult.(1)Aircraft shall not be serviced with oxygenwhen any of the following conditions prevail,•Aircraft electrical switches are on.•Ground powered equipment is operatingwithin 50 feet of the servicing area.•Aircraft is being serviced with fuel, oil, or anti-icing fluids•Any combustible materials, fluids, etc., areevident around oxygen servicing equipment.9-41
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