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--140 Change 6 2--11 OPERATION OF FIRE CONTROL EQUIPMENT UNDER NORMAL CONDITIONS — CONTINUED 2--11.1 M117/M117A2 Panoramic Telescope and M145/M145A1 Telescope Mount — Continued d. Quick Alinement of M117/M117A2 Panoramic 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 (28) onto dovetail door wedge (29) in front of panoramic telescope ballistic cover (30) and secures in position by turning clamping catch (31). Ensure M140/M140A1 alinement device is securely latched. 2.1 If using ERLS version, depress button (31.1) to activate. 3 To rotate panoramic telescope ballistic cover (30), release brakes using rod end clevis assemblies (32) inside cab and rotate by holding webbing straps (33). 4 Sighting through M117/M117A2 panoramic telescope (1) eyepiece at M140/M140A1 alinement device (28), line up apertures as shown. At this setting, M117/M117 panoramic telescope is in close alinement with cannon tube. 5 Driver should release clamping catch (31) and remove M140/M140A1 alinement device (28) from dovetail door wedge (29) and hand it to gunner for stowage.