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OVERLOAD TEST
AIRCRAFT PANEL-MOUNTED REGULATORS

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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CAUTION OPEN FLUTTER DAMPENER VALVE (J) 1/4 TURN. IF THE REGULATOR CAUSES THE FLUID IN PRESS/SUC- TION MANOMETER (4) TO FLUTTER, OPEN FLUTTER DAMPENER VALVE (J) SLOWLY UNTIL THE FLUTTER IS ELIMINATED. IF AT ALTITUDE DESCEND TO SEA LEVEL PRIOR TO OPENING VALVE (J) AS THE PRESS/ SUCTION MANOMETER CAN BE EASILY OVERLOOKED. WHEN ASCENDING TO ALTITUDE MAIN- TAIN AN OUTPUT FLOW OF 6.0 INCHES OF H2O. NOTE: When increasing flows the inlet pressure must be adjusted to maintain the correct inlet pressure on N2 INPUT PRESS gauge (27). 2. With OUTPUT valve (C) closed, read PRESS/SUCTION manometer (4) and enter the reading in the appropriate block on the performance test sheet. 3. Adjust OUTPUT valve (C) to the equivalent of 100 lpm as indicated on the OUT- PUT manometer (1). Read the safety pressure as indicated on the PRESS/SUCTION manometer (4) and enter this figure on the performance test sheet. The safety pressure must not be less than 0.50 nor greater than 2.5 inches in H2O for all flows. 4. Adjust low-pressure regulator (N) to 90 psig as indicated on the N2 INPUT PRESS gauge (27). 5. Repeat steps 2 and 3. 6. Close the altitude chamber door. 7. Ensure that REF PRESS SELECTOR valve (O) is in the ALT. POSITION. NOTE: A 6.0-inch flow in H2O must be drawn with OUTPUT valve (C). Open FLUTTER DAMPENER valve (J) 1/4 turn. 8. If the altitude chamber is inadvertently taken above the test altitudes, open chamber bleed valve (K) slowly and descend to the desired altitudes. Close valve (K). 9. Using VACUUM CONTROL valve (B), ascend to 34,000 feet as indicated on LOW RANGE ALTM. (13). 10. Repeat steps 1 through 5. NOTE: If low safety pressure is en- countered, dispose of the regulator. If high safety pressure is encountered at 34,000 feet, before disposing of the regulator ensure that the pressure breathing has not cut-in before 35,000 feet giving a false indication of high safety pressure. 11. Leave the position of all controls and connections unchanged, and continue to the pressure breathing test. PRESSURE BREATHING TEST. To per- form the pressure breathing test, proceed as follows: NOTE: If problems are encountered during this test, refer to pressure breathing troubleshooting table 12-2 for adjustment of the pressure breathing aneroid. 1. Open OUTPUT valve (C)and draw a flow of 6.0 inches in H2O through the regulator. Using VACUUM CONTROL valve (B) ascend to 35,000 feet as indicated on the LOW RANGE ALTM. (13). Table 12-2.—Troubleshooting (Pressure Breathing Test) 12-5







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