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--177 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.2 Boresighting — Continued c. Checking M140/M140A1 Alinement Device While Boresighting on Test Target 1 Level gun trunnions (para 3--7.3). 2 Aline cannon tube, M117/M117A2 panoramic telescope, and M118A2/M118A3 elbow telescope on test target (para 2--12.2b.). WARNING The M140 alinement device is radioactively illuminated. Check for loss of luminescence, breakage, damage, or defects. If present, follow the procedures on pages b and c. 3 Install M140/M140A1 alinement device (27) on dovetail door wedge (28) in front of panoramic telescope ballistic cover (29). 27 28 29