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 2–12 PREPARATION FOR FIRING — CONTINUED 2–12.1 Pre-Firing Emplacement — Continued a. Emplacing Howitzer — Continued In order to prevent damage to M118A2/M118A3 elbow telescope, stow against upper stop when not in use. Do not use as a handhold under any circumstances. 24 Assistant gunner checks M118A2/M118A3 elbow telescope (24) as follows. (a) Depress lock-release lever (25) to adjust eyepiece arm (26) to a convenient viewing angle. (b) Adjust variable resistor knob (27) for reticle illumination. (c) Center level vial (28) by turning red wormshaft assembly knob (29). (d) Verify that elevation dial (30) and deflection scale dial (31) on M146 telescope mount (32) are set 4 to center scale. 25 Chief of section conducts pre-fire checks (para 2–12.4) and verifies howitzer is prepared for action, and reports “SIR, NUMBER (SO AND SO) IN ORDER” or reports any defects section cannot correct. 2-158