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--164 Change 6 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.1 Pre-Firing Emplacement — Continued c. Emplacing Infinity Aiming Reference M1A1/M1A2 Collimator — Continued 3 The gunner directs emplacement of M1A1/M1A2 collimator (21) by extending his left hand above his head through gunner’s escape hatch and having cannoneer no. 3 move as directed by following hand movements. (a) Moving hand (left or right) represents movement of M1A1/M1A2 collimator (21) left or right. (b) Clenched fist means stop. (c) Up and down movement represents emplace. (d) Tapping top of vehicle and moving hand (left or right) represents movement of top of M1A1/M1A2 collimator (21). (e) Hand waved in a circular motion means for cannoneer no. 3 to return. 21 56