TM-9-2350-311-34-2 Maintenance Manual for Volume 2 M109 Cab Download
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TM 9-2350-311-34-2 1-14 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS — CONTINUED 1-14.14 Location and Description of Overall Sighting and Fire Control System — Continued The M1A1 collimator is radioactively illuminated. Check for presence of illumination and damage. If discovered broken, damaged, or defective, follow the procedures on page b. e. M1A1 Collimator. When in use, the M1A1 collimator (7) is mounted on a tripod a short distance from vehicle. Its illumi- nated retitles provide a fixed reference point to correct sighting after a round has bean fired. The M1A1 collimator contains radioactive tritium gas (H 3 ). For information on M1A1 collimator, refer to TM 9-1240-324-34&P. 1-36 Change 1