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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 2--168 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.1 Pre-Firing Emplacement — Continued e. Measuring Site to Crest NOTE Ensure aiming points are established. 1 Chief of section selects highest crest in his sector of fire. 2 Chief of section sights along the bottom part of cannon tube. 3 Chief of section directs gunner to traverse and assistant gunner to elevate cannon tube until bottom of cannon tube just clears crest. 4 Chief of section directs assistant gunner to level cross-level (43) and elevation level (42) bubbles of M15 elevation quadrant (41). 5 Chief of section reads quadrant off of M15 elevation quadrant (41) scale, records this reading, and estimates range to crest (M1A1 gunner’s quadrant may also be used). 41 42 43