ANEROID CLOSURE TEST.- The aneroid closure test is preformed only if the regulator fails the oxygen ratio test. To perform the aneroid closure test, proceed as follows:

1. Descend to 25,000 feet by using the CHAMBER BLEED valve.

2. Ensure that the inlet pressure is as specified on the Performance Test Sheet.

3. Setup a flow of 5.0 inches of H2O on the OUTPUT FLOW manometer with OUTPUT valve.

4. The aneroid closes between 28,000 and 32,000 feet, as indicated by no further advance in altitude on the LOW RANGE altimeter.

5. Close the OUTPUT valve and descend to sea level by using the CHAMBER BLEED valve.

6. If the regulator fails aneroid closure test and/or oxygen ratio test, locate probable cause using troubleshooting chart, table 12-13.

SAFETY PRESSURE AND PRESSURE BREATHING TEST.- This test determines if 100-percent oxygen is being delivered to the user through the regulator between 30 and 50,000 feet.

Table 12-13.-Troubleshooting (Oxygen Ratio/Aneroid Closure Tests)

To perform the safety pressure and pressure breathing test, proceed as follows:

1. By using the LOW PRESSURE REGULA-TOR, apply 150 psig to the regulator inlet. If chamber altitude is not at 30,000 feet, adjust the altitude by using VACUUM CONTROL valve (B1) to increase or CHAMBER BLEED valve to decrease altitude.

2. Using the OUTPUT valve, draw flows of 0, 40, and 85 lpm through the regulator. Delivery pressure must be within limits shown on Regulator Performance Test Sheet. Maintain 3.0 inches of H2O on output manometer with OUTPUT valve while ascending to altitude. The reading for 0 lpm must also be recorded at each test altitude.

3. Repeat step 2 for each altitude shown on the Performance Test Sheet.

4. Close the OUTPUT valve and descend to sea level by using CHAMBER BLEED valve.

5. If the safety pressure breathing flows are not within limits, locate the probable cause using troubleshooting chart, table 12-14.

BLINKER ASSEMBLY TEST.- This test ensures that the blinker operates correctly with a demand placed on the regulator. To perform the blinker assembly test, proceed as follows:

1. Ensure that diluter control lever is in the NORMAL OXYGEN position.

2. By using the LOW PRESSURE REGULA-TOR, apply 150 psig to the regulator inlet.

3. Using OUTPUT valve draw a 20 lpm through the regulator. The blinker must open fully.

4. Reduce output flow to 8 lpm and place the diluter control lever in the 100-percent OXYGEN position. The blinker must remain fully open.

5. Close OUTPUT valve. The blinker should close immediately.

6. Close the altitude chamber door. Ascend to altitude while maintaining 3.0 inches of H2O on the OUTPUT manometer with the OUTPUT valve.

7. By using the VACUUM CONTROL valve (B1) ascend in altitude until 17.0 inches of H2O is indicated on the PRESSURE/SUCTION manometer.

8. Open OUTPUT valve and draw a flow of 12 lpm through the regulator. The blinker should be fully open. Close OUTPUT valve and the blinker should close immediately.

9. Descend to sea level using the CHAMBER BLEED valve.

10. Adjust or replace improperly functioning blinkers.

EMERGENCY PRESSURE TEST.- Deterrnine how much pressure is supplied to the user on emergency pressure. To perform the emergency pressure test, proceed as follows:

1. Ensure the diluter control lever is in the NORMAL OXYGEN position.

2. By using the LOW PRESSURE REGULA-TOR, apply 150 psig to the inlet of the regulator.

3. Open the OUTPUT valve and draw a 10 lpm flow through the regulator.

Table 12-14.-Troubleshooting (Safety Pressure/Pressure Breathing Test)

4. Place the emergency control lever in the EMERGENCY position. Pressure indicated on PRESSURE/SUCTION manometer should read 2.0 to 4.0 inches of H2O .

5. Adjust the OUTPUT valve to draw 80 lpm through the regulator.

6. Place the diluter control lever in the 100-percent OXYGEN position. Pressure at outlet of regulator, as indicated on PRESSURE/ SUCTION manometer, should be no less than 1.0 inches of H2O.

7. Close the OUTPUT valve. With zero flow, outlet pressure should not exceed 5.5 inches of H2O.

8. Adjust the output to 10 lpm. Hold the emergency pressure control lever in TEST MASK position. The output flow indicated on the PRESSURE/SUCTION manometer should be 6.0 to 16.0 inches of H2O.

9. Close the OUTPUT valve. With zero flow, outlet pressure should not exceed 17.5 inches of H2O. Release the emergency pressure control lever. If the regulator fails, adjust the emergency pressure control lever stem to obtain 3.0 to 4.0 inches of H2O at 10 lpm first, then compensate for excessive pressure drop at 80 lpm flow with the elastic stop nut.

10. If the emergency pressure flows are not within tolerance, locate the probable cause by using the troubleshooting chart, table 12-15.

11. Close the N2 supply cylinder valve, by using the LOW PRESSURE REGULATOR and SYSTEM BLEED valve, relieve all pressure in the test stand. Secure all test stand valves.

12. Test stand operator and CDI must sign the Performance Test Sheet. The original, or a copy of the Performance Test Sheet is forwarded to the operational custodian of the regulator.