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 Change 6 2--159 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.1 Pre-Firing Emplacement — Continued b. Laying the Howitzer Using the M2/M2A2 Aiming Circle NOTE Gunner uses M117/M117A2 panoramic telescope to lay howitzer for direction. 1 Upon gunnery sergeant’s command, “BATTERY ADJUST AIMING POINT THIS INSTRUMENT,” gunner uses door release (33) to lift access door (34) covering azimuth counter (35) on M117/M117A2 panoramic telescope (36). 2 Gunner ensures bubbles in pitch level (37) and cross-level (38) on M145/M145A1 telescope mount (39) are centered and gunner’s aid counters (40) are set at ZERO. 3 Assistant gunner sets 0--300 mils on M15 elevation quadrant (41), then depresses or elevates cannon tube (not shown) until elevation level (42) bubble centers. Ensure that elevation level and cross-level (43) bubbles are centered throughout laying process. 33 34 35 36 37 38 39 40 41 42 43