TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 3-7 FIRE CONTROL ALINEMENT TESTS AND MEASUREMENTS - CONTINUED 3-7.12 7 8 9 10 Testing the M15 Elevation Quadrant and Auxiliary Quadrant (On M145/M145A1 Telescope Mount) — Continued Turn the cross-level mechanism knob (13) on the M145/M145A1 telescope mount (14) and center cross-level (15) bubble. Turn pitch-level knob (16) and center pitch-level (17) bubble. Turn correction knob (18) and zero the correction counter (19). Turn elevation handwheel (20) and center elevation level (21) bubble. Check reading on elevation counter (22). It should read no less than 9999 (–1 mil elevation) and no more than 0001 (+1 mil elevation). 3-111