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FILL AND BUILDUP TIME TEST
CONVERTER CHARGE

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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10. Observe and record capacitance reading from test stand capacitance gauge in space provided on Performance Test Sheet. Reading should be between C(max) and C(min). 11. If the test is not within these limits and the converter has not been purged in previous tests, there may be moisture in the sphere. Purge the converter and refill it with LOX, then repeat steps 1 through 11. 12. If the converter is still not within limits, condemn the converter. 13. Secure the tester and disconnect the cables from the converter and tester. If the converter passes capacitance test, carefully remove it from the scales and allow it to remain undisturbed for 1 hour. EVAPORATION LOSS TEST (BUILDUP AND SUPPLY MODE) To perform the evaporation loss test in the buildup and supply mode, proceed as follows: 1. At the end of the 1 hour period, gently place the converter on the scales and record its weight and the start time in the spaces provided on section 8 of the Performance Test Sheet. 2. Place the converter assembly aside again and allow it to remain undisturbed for 24 hours. 3. At the end of the 24-hour period, carefully replace the converter on the scales. 4. Record the time and weight in the spaces provided on the Performance Test Sheet. The 24 hour weight loss must be less than 3 pounds. There should not be a heavy coat of frost on the sphere. 5. If the weight loss was 3.0 pounds or less, and there was not excessive frosting of the sphere assembly, proceed to the flow test. If the loss was more than 3.0 pounds, proceed to the EVAPORATION LOSS TEST. EVAPORATION LOSS TEST (VENTED MODE) Maximum allowable loss of LOX in 24 hours is 5.0 pounds. Minimum allowable loss is defined as the weight recorded during the buildup and supply mode minus 0.5 pound (performed only if converter fails evaporation loss test in buildup and supply mode). To perform the evaporation loss test in the vented mode, proceed as follows: 1. With the converter still on the scales, attach the test stand fill valve adapter (P/N 59A120-D5-10) to the fill, buildup, and vent valve on the converter. WARNING VENTING A CONVERTER THAT IS IN A BUILDUP AND SUPPLY MODE CAUSES A BLAST OF LOX FROM THE VENT PORT. ENSURE THAT VENT BLAST IS DIRECTED AWAY FROM ALL PERSONNEL, AND THAT ADEQUATE CLOTHING AND FACIAL PROTECTION ARE WORN. 2. Turn the knurled knob of the adapter in until it seats. This places the converter in the vented mode. 3. Record the time and weight in section 9 of the Performance Test Sheet. 4. Place the converter aside and allow it to remain undisturbed in the vented mode for 24 hours. 5. At the end of the 24-hour period, carefully replace the converter on the scales. 6. Record the time and the converter weight on the Performance Test Sheet. Weight loss in 24 hours should not exceed 5.0 pounds for this test to be satisfactory. 7. If the weight loss is too much, locate the probable cause by using the troubleshooting chart in table 12-22. Table 12-22.—Troubleshooting (Evaporation Loss Test) 12-31







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