TM-9-1290-262-24&P Technical Manual for M2A2 Aiming Circle Download
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ARMY TM 9-1290-262-24&P MARINE CORPS TM 00476C-24&P AIR FORCE TO 49A7-3-72/74 4-4. TEST AND ADJUSTMENT PROCEDURES (cont). LIFT TEST 1 Set azimuth ring (1) of test fixture to zero. 2 Set aiming circle azimuth index (2) and micrometer scale (3) to zero. 3 Using orienting knob (4) quick release, direct aiming circle elbow telescope line-of-sight into collimator. 4 Using orienting knob (4), adjust aiming circle to superimpose elbow telescope vertical reticle line on collimator vertical reticle line. 5 Using elevating knob (5), superimpose aiming circle horizontal reticle line on collimator horizontal reticle line. 6 Sight through elbow telescope eyepiece (6) and turn aiming circle azimuth knob (7) 20 mils in one direction. Turn aiming circle back to starting point, then 20 mils in opposite direction and back again to starting point. Elbow telescope horizontal reticle line must not rise more than 0.4 mil during these azimuth swings. 7 Repeat step 6 every 1600 mils through one complete revolution using orienting knob (4). If elbow telescope horizontal reticle line rises more than 0.4 mil, repeat steps 1 thru 6. 4-34