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Functional Check
Table 7-4.Charging Stages

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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15. Ensure that bleed valve V-2 is opened and all other test stand valves are closed. 16. Measure the force required to disengage the automatic oxygen release with a scale. This force should be 10 to 30 pounds when it dis- engages; the emergency oxygen system should actuate and indicate 45 to 80 psi on gauge PG-1. 17. Reset the reducer. 18. Open valve V-5 to bleed pressure. 19. When pressure is bled, as indicated by no indication on gauges PG-1 and PG-4, close valve V-5. Now, observe gauge PG-4 for 2 minutes. Any pressure rise indicates leakage in the valve seat of the reducer/manifold. 20. Open valve V-5 and close valve V-2. 21. Disconnect the oxygen hose from fitting C-1. 22. Ensure all valves on the test stand are secured. 23. Connect the oxygen outlet hose to fitting NIP-6. Ensure that valve V-10 is open and all other test stand valves are closed. 24. Connect the test stand hose between fitting NIP-5 and fitting NIP-4. 25. Move valve V-1 to the NIP-4 position. 26. Ensure that 1,800 to 2,000 psi is in the oxygen cylinder of the kit. 27. Pull the manual oxygen release. Slowly open valve V-9 to indicate 90 liters per minute on gauge PG-2. Oxygen pressure should be indicated as 45 to 80 psi on gauge PG-1. 28. Observe emergency oxygen cylinder pressure gauge and allow the system to decrease to 250 psi while maintaining 90 LPM and 45 to 80 psi pressure. When needle of this cylinder pressure gauge is between the E and F of REFILL, pressure is approximately 250 psi. 29. Close valve V-9. 30. With zero flow indicated on gauge PG-2, gauge PG-1 should indicate 45 to 80 psi. 31. Reinstall the manual oxygen release (if separating type) and reset the reducer. 32. Bleed the oxygen pressure from the system by opening valves V-5 and V-2. All pressure is bled when gauges PG-1 and PG-4 indicate zero pressure. 33. Disconnect the kit from the test stand. 34. Secure the test stand. 35. Thoroughly clean all areas wetted with leak test solution with clean water. Dry them with a lint-free cloth, filtered low-pressure compressed air, or by low-pressure nitrogen. 36. Recharge the emergency oxygen cylinder to 1,800 to 2,000 psi. 37. Perform a release handle pull test on the fully packed kit. (Refer to NAVAIR 13-1-6.3 for instructions.) PURGING AND CHARGING EMERGENCY OXYGEN SYSTEMS To purge and charge the emergency oxygen cylinder, proceed as follows: Materials Required Leak detection compound Oxygen purging electric heater Nitrogen, type I, class I, grade  A Aviator’s breathing oxygen, type I Shutoff valve Pressure regulator Adapter, filling 1. If the survival kit assembly has not been removed from the aircraft, remove the personnel parachute and survival kit in accordance with the applicable maintenance manual. 2. Remove the oxygen filler valve cap and connect a filling adapter to the filler valve (fig. 7-9). If the emergency oxygen system is Figure 7-9.—Filling adapter. 7-8







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