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--156 Change 6 2--12 PREPARATION FOR FIRING — CONTINUED 2--12.1 Pre-Firing Emplacement — Continued a. Emplacing Howitzer — Continued WARNING The M1A1 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. 12 Driver removes quick release pin (17), opens M42 tank periscope (18) cover door (19), and locks cover door in open position with quick release pin. 13 Cannoneer no. 2 removes muzzle brake cover (20). 14 Assistant gunner removes M1A1/M1A2 collimator (21) and hands it to cannoneer no. 3 to emplace at left front of howitzer. 17 18 19 20 21