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 Change 6 3--39 3--6 ARMAMENT AND CAB MAINTENANCE — CONTINUED 3--6.1 Maintenance of Sighting and Fire Control Equipment — Continued e. M1A1 Collimator 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. CAUTION The M1A1 collimator has an airtight seal. Breaking seal by removing any part will expose internal mechanism to moisture and may eventually impair operation of instrument. 1 Follow maintenance instructions of sighting and fire control for inspection and care of M1A1 collimator (10) (para 3--6.1a. and 3--6.1b.) 2 Notify unit maintenance for correction of unserviceable components. 10