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--45 Table 2--1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF-PROPELLED HOWITZER — CONTINUED Location Item No. Not Fully Mission Capable If: Crewmember Procedure Item to Check/ Service Interval 26 Before M117/M117A2 Panoramic Telescope (Cont) GUNNER d. Check that variable resistor knob (4) moves freely and light goes from dim to bright and bright to dim. e. Check counters (5) to make sure viewing win- dows are not broken and numbers are legible and do not skip. Counters skip. f. Make sure mounting is secure. Mounting is inse- cure. 5 5 4