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 3-7.3 Leveling Gun Trunnions — Continued a. Plumbline Method-Continued 14 Set off 100 mils on M15 elevation quadrant (12) and elevate the cannon tube (6) manually until the elevation bubble (15) centers. 3-90