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AC 43.13-1B CHG 1 9/27/01 (1) Inspection. Do not attempt to charge oxygen cylinders if any of the following discrepancies exist: (a) Inspect for contaminated fittings on the manifold, cylinder, or outside filler valve. If cleaning is needed, wipe with stabi- lized trichlorethylene and let air dry. Do not permit the solvent to enter any internal parts. (b) Check the hydrostatic test date of the cylinder. DOT regulations require ICC or DOT 3AA 1800 designation cylinders to be hydrostatic tested to 5/3 their working pres- sure, every 5 years (10 years if they meet the requirements in 49 CFR 173.34,e, 16). Cylinders bearing designation ICC or DOT 3HT 1850 (Ref. 49 CFR 173.34,e, 15) must be hydrostatic tested to 5/3 their working pressure every 3 years, and retired from service 24 years or 4,380 filling cycles after the date of manufacture, whichever occurs first. (c) If the cylinder is completely empty, do not charge. An empty cylinder must be removed, inspected, and cleaned before charging. (2) Charging. (a) Connect the cylinder valve outlet or the outside filler valve to the manifold. (b) Slowly open the valve of the cylinder to be charged and observe the pres- sure on the gauge of the manifold system. (c) Slowly open the valve of the cyl- inder on the manifold system having the low- est pressure and allow the pressure to equalize. (d) Close the cylinder valve on the manifold system and slowly open the valve of the cylinder having the next highest pressure. Continue this procedure until the cylinder has been charged in accordance with table 9-5. (e) Close all valves on the manifold (f) Close the valve on the filled cyl- inder and remove the cylinder from the mani- fold. (g) Using a leak detector, test for leakage around the cylinder valve threaded connections. (If leakage is present, discharge the oxygen and return the cylinder to the facil- ity for repair.) (h) Let the cylinder stabilize for a pe- riod of at least 1 hour, and then recheck the pressure. (i) Make any necessary adjustments in the pressure. b. Charging of Low-Pressure Oxygen Systems and Portables. For recharging a low-pressure aircraft oxygen system, or port- able cylinders, it is essential that the oxygen trailer or cart have a pressure-reducing regu- lator. Military types E-2 or C-1 reducing regulators are satisfactory. These types of regulators reduce the large cylinder pressure from 2,000 psi to a line pressure of 450 psi. (A welding pressure-reducing regulator is not satisfactory.) CAUTION: When refilling the low- pressure system or portable cylinders, open the oxygen filler tank valve slowly to allow the system or portable cylinders to be filled at a slow rate. After the refilling operation is com- pleted, check for leaks with a leak de- tector. If a leak is detected, para- graph 9-49b(2)(d) should be referred to for corrective action. system. Page 9-42 Par 9-51PDF Image | AFS-640
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