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9/27/01 9-50. FUNCTIONAL TESTING AFTER REPAIR. Following repair, and before in- spection plates, cover plates, or upholstering are replaced, test the entire system. a. Open the cylinder valve slowly and observe the pressure gauge on a high-pressure system. A pressure of approximately 1,800 psi (at 70 °F) should be indicated on the gauge. (Cylinder pressure will vary considerably with radical temperature changes.) (1) Check the system by installing one of the mask hose fittings (minus the mask) in each of the cabin wall outlets to determine whether there is a flow. If a demand mask is used, check by breathing through the mask and, if appropriate, clean the mask according to paragraph 9-49d. (2) Check the complete system for leaks in accordance with the procedure outlined in paragraph 9-49b(2)(d). (3) If leaks are found, close the cylinder valve and open an outlet to reduce the pressure in the system to zero. b. The following checks may be made for a pressure drop check of the system. (1) Open the cylinder valve and pres- surize the system. Observe the pressure gauge (a pressure of approximately 1,800 psi at 70 °F should be indicated). For the light weight ICC 3HT 1850 cylinders, pressurize the system to approximately 1,850 psi at 70 °F. (2) Close the cylinder valve and wait approximately 5 minutes for temperatures to stabilize. (3) Record the pressure gauge reading and temperature and after 1 hour, record the pressure gauge reading and temperature again. AC 43.13-1B CHG 1 (4) A maximum pressure drop of 100 psi is permissible. NOTE: Conduct the above tests in an area where changes of temperature will be less than 10 °F. If a leak oc- curs during the 1-hour period, suit- able corrections would be required, or reconduct the test under conditions of unvarying temperatures. 9-51. SERVICE OXYGEN CYLINDERS. REQUIREMENTS (Ref 49 CFR 173.34 e, 16). Standard-weight cylinders must be hydro- static tested at the end of each 5-year period (10 years if it meets the requirements in 49 CFR 173.34 e, 16). This is a Department of Transportation (DOT) requirement. These- cylinders carry an ICC or DOT 3AA 1800 classification and are suitable for the use in- tended. Lightweight cylinders must be hydrostatic tested every 3 years, and must be retired from service after 24 years or 4,380 pressurizations, whichever occurs first. These cylinders carry an ICC or DOT 3 HT 1850 classification and must be stamped with the approval after being inspected. (Ref. 49 CFR 173.34 e, 15). CAUTION: Use only aviation breathing oxygen when having the oxygen bottle charged. a. Charging High-Pressure Oxygen Cylinders. The following are recommended procedures for charging high-pressure oxygen cylinders from a manifold system, either per- manently-installed or trailer-mounted. CAUTION: Never attempt to charge a low-pressure cylinder directly from a high-pressure manifold system or cylinder. Par 9-49 Page 9-41PDF Image | AFS-640
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