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 Item No. 55 Interval After Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF-PROPELLED HOWITZER — CONTINUED Location Item to Check/ Service M42 Tank Periscope Crewmember Procedure ASSISTANT GUNNER a. After firing, check M42 tank periscope (1) for moisture, fungus, dirt, or condensation within field of view. b. Clean window and close cover. Not Fully Mission Capable If: 2-73