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--220 Change 6 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.6 Laying For Direction and Quadrant During Indirect Fire Mission — Continued c. Switching Aiming Points 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. In the event that a gunner needs to switch aiming points any time after he has established one (i.e. switch from the M1A1/M1A2 collimator (10) to the M1A2 aiming posts (13), or switch from the M1A2 aiming posts to the DAP method), the following steps will place the gunner on his new aiming point. NOTE If in a fire mission, follow steps 1 through 6. Otherwise, follow steps 1 and 2. These steps will place the gunner on his new aiming point. 1 The gunner opens the access door (11) that covers M117/M117A2 panoramic telescope (1) azimuth counter (12). The gunner then turns the azimuth knob (2) until the azimuth counter shows the value from the gunner’s reference card for the aiming point being used. 2 The gunner closes access door (11) and rotates reset knob (14) on the M117/M117A2 panoramic telescope (1) until 3200 appears on reset counter (3). 3 The gunner sets the deflection given in the fire mission on the azimuth counter (12) using the azimuth knob (2). 4 The gunner centers the pitch level (5) and cross level (6) bubbles on the M145/M145A1 telescope mount (7) and reads the setting to the chief of section. 5 The gunner takes up proper sight picture on the new aiming point and verifies that both pitch level (5) and cross level (6) bubbles are centered. 6 Fire according to the fire command. 10