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--165 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.1 Pre-Firing Emplacement — Continued c. Emplacing Infinity Aiming Reference M1A1/M1A2 Collimator — Continued 4 Sighting through M117/M117A2 panoramic telescope (36), gunner commands cannoneer no. 3 to rotate M1A1/M1A2 collimator (21) azimuth adjustment knob (56) until M117/M117A2 panoramic telescope crosshairs (45 and 47) are centered with M1A1/M1A2 collimator reticle crosshairs (61), as shown. Gunner then motions cannoneer no. 3 in. 5 Gunner then records value appearing on his azimuth counter (35) and closes access door (34). 6 Gunner rotates reset knob (62) on M117/M117A2 panoramic telescope (36) until 3200 appears on reset counter (63). 36 45 47 63 62 61 34 35