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ZERO ALTITUDE ADJUSTMENT
REFERENCES - TM-10-1670-305-23P_163

TM-10-1670-305-23P Automatic Ripcord Release AR2 Model 451 NSN 1670-01-369-7914 Test Chanber Assembly AR2 Model 452 NSN 1670-01-370-0752 Manual
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TM 10-1670-305-23&P ELECTRONIC TEST CHAMBER ASSEMBLY, MODEL 453 0025 00 DIRECT SUPPORT MAINTENANCE RATE ADJUSTMENT This adjustment is performed in response to a reported defect from user level.  The following procedure is used to correct an out of tolerance condition between the set fall rate and the actual measured rate.  The difference between the set and displayed rates cannot be affected by adjustment. NOTE All four fall rate combinations; high altitude-high fall rate, high altitude-low fall rate, low altitude-high fall rate, and low altitude-low fall rate, must be evaluated together because adjustment of any one of them affects the entire range.   Correct adjustment should bring all of the actual measured rates within 2 ft/sec of their respective set values.  If this cannot be done, the Control Assembly is defective and must be replaced. 1.    Perform fall rate selector accuracy test (refer to WP 0010 00) to determine at which condition(s) the fall rate is out of tolerance. It is not necessary to place an AR2 in the altitude chamber for this test, and the JUMP/OFF switch may be left in the JUMP position. 2.    Open cover plate on back of control housing.  Turn RATE SET resistor screw to adjust the fall rate (One half turn of the screw in the clockwise direction will lower the actual fall rate by approximately one ft/sec.  The set rate is not affected by the adjustment.  There is some backlash in the movement of the screw; turning past the desired position and coming back to it may be beneficial). 3.    Verify that the actual fall rates are within tolerance at all four conditions. 4.    Reassemble cover plate and affix calibration sticker to prevent tampering. END OF WORK PACKAGE 0025 00-5/6 Blank Change 1







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