OXYGEN SUPPLY VALVE LEAKAGE TEST

Table 12-5A.Troubleshooting (Inward Leakage Test)

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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11. Disconnect the line from the LOW PRESSURE connection and REF. TAP in the altitude chamber. Disconnect the regulator outlet from N₂INPUT connection, and remove the plug from the piezometer. 12. If excessive leakage is indicated, locate the probable cause by using troubleshooting chart, table 12-5A. Outlet Leakage Test To perform an outlet leakage test, proceed as follows: 1. Place the regulator supply valve control lever in the ON position. 2. Ensure that the diluter control lever is in the 100-percent OXYGEN position. 3. Place the emergency pressure control lever in the NORMAL position. 4. Mount the regulator on a horizontal plane in the test chamber. Connect the regulator inlet to the N₂INPUT connection (18) inside the altitude chamber. 5. By using the LOW PRESSURE REG- ULATOR, apply 150 psig to the regulator inlet. 6. Slowly turn the INLET PRESSURE ON/OFF valve to ON. 7. Activate the emergency pressure control lever to allow a flow through the regulator, then return the lever to its NORMAL position. 8. Draw a film of leak detection compound (MIL-L-25567) across the regulator outlet. The film should not advance more than 1/2 inch in 10 seconds. If the film advance is more than allowable, repeat the test three or four times. (Distention could be caused by difference in temperature between inside and outside of regulator.) 9. If the film advance continues to be more than allowed, locate the probable cause by using the troubleshooting chart, table 12-5B. 10. Relieve pressure on the regulator by back- ing out on the LOW PRESSURE REGULATOR. OXYGEN SUPPLY VALVE LEAKAGE TEST.— If the supply pressure could not be shut off, until a demand was placed on it, a pressure buildup could be created. It could damage the regulator hose or mask and possibly injure the crewmen. To perform the oxygen supply valve leakage test with the regulator still mounted in the chamber, proceed as follows: 1. Place the regulator oxygen supply valve lever in the OFF position. Table 12-5B.—Troubleshooting (Outlet Leakage Test) 12-11

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