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--148 Change 6 2--11 OPERATION OF FIRE CONTROL EQUIPMENT UNDER NORMAL CONDITIONS — CONTINUED 2--11.2 M118A2/M118A3 Elbow Telescope and M146 Telescope Mount — Continued d. Quick Alinement of M118A2/M118A3 Elbow Telescope Using the M140/M140A1 Alinement Device — Continued NOTE Ensure mounting surfaces are clean and free of burrs. If dovetail door wedge has burrs, notify unit maintenance. 2 Driver slips M140/M140A1 alinement device (23) onto dovetail door wedge (24) in front of M42 tank periscope (25) cover door (26). 2.1 If using ERLS version, depress button (27) to activate. 3 Sighting through M118A2/M118A3 elbow telescope (1) eyepiece (21) at M140/M140A1 alinement device (23), line up apertures as shown. At this setting, M118A2/M118A3 elbow telescope is in close alinement with cannon tube. 4 Driver removes M140/M140A1 alinement device (23) from dovetail door wedge (24) and hands it to gunner for stowage.