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 3--38 Change 6 3--6 ARMAMENT AND CAB MAINTENANCE — CONTINUED 3--6.1 Maintenance of Sighting and Fire Control Equipment — Continued d. M140 Alinement Device WARNING The M140 alinement device is radioactively illuminated. Check for loss of luminescence, breakage, damage, or defects. If present, follow the procedures on pages b and c. In a low light environment, check M140 alinement device (9) for illumination. If illumination is weak, notify local Radiation Protection Officer. 9