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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 Change 6 2--185 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.2 Boresighting — Continued e. Checking Boresight of the M118A2/M118A3 Elbow Telescope Using the M140/M140A1 Alinement Device — Continued NOTE Always check to see that bubble is centered in level vial of M118A2/M118A3 elbow telescope every time you elevate or traverse. 3 Aline cant correction scribe lines (36) and sight through M118A2/M118A3 elbow telescope (32). Boresight crosshairs of M118A2/M118A3 elbow telescope should be in alinement with M140/M140A1 alinement device (27).