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TABLE 1.  ALTITUDE ERROR TOLERANCES
RATE ADJUSTMENT

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 - CONT ZERO ALTITUDE ADJUSTMENT NOTE Zero altitude adjustment is required if altitude accuracy is out of tolerance.   Perform adjustment with unit set up as in preceding paragraphs. 1.    Use SET ALTITUDE control to set standard instrument to first value in Table 1. 2.    Remove top screw securing cover plate, loosen bottom screw and rotate cover plate to side, breaking calibration seal and exposing adjustable resistors. 3.    Adjust ALT SET resistor screw (refer to control assembly decal); until ALTITUDE (FT MSL) display comes to within 5 feet of reading on standard instrument. 4.    Verify tolerances for all other altitude values listed in Table 1.  If required, readjust ALT SET within the allowable 30-foot tolerance at zero altitude to obtain the prescribed accuracy for the other altitudes. NOTE If altitude cannot be brought within prescribed accuracy tolerances, control assembly must be returned to depot for repair. 5.    Reassemble cover plate and affix a calibration sticker over cover plate to prevent tampering. Change 1 0025 00-4







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