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--215 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.6 Laying For Direction and Quadrant During Indirect Fire Mission NOTE Laying howitzer for direction and quadrant during indirect fire missions is the duty of gunner and assistant gunner, respectively. These operations are normally done at same time. a. Laying for Direction Using M1A1/M1A2 Collimator WARNING The M1A1/M1A2 collimator is radioactively illuminated. Check for presence of illumination and damage. If discovered broken, damaged, or defective, follow the procedures on pages b and c. 1 Upon announcement or data display of “DEFLECTION (SO MUCH),” gunner rotates M117/M117A2 panoramic telescope (1) azimuth knob (2) until announced deflection appears in reset counter (3). Gunner then reads setting to chief of section. 2 Sighting through M117/M117A2 panoramic telescope (1) eyepiece (4), gunner traverses howitzer until a proper sight picture on aiming point is achieved. NOTE Each time howitzer is traversed or cannon tube is elevated or depressed, gunner must repeat steps 2 and 3 before alining M117/M117A2 panoramic telescope on any aiming reference point. 3 Gunner centers pitch level (5) and cross-level (6) on M145/M145A1 telescope mount (7). 1 2 3 4 5 6 7