TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
Page 274 of 775
TM 9-2350-311-10 2-12 PREPARATION FOR FIRING — CONTINUED 2–12.2 Boresighting — Continued b. Test Target Method — Continued 9 10 11 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. Rotate deflection knob (22) and elevation knob (23) on M146 telescope mount (24) to lay reticle on right hand butterfly of aiming diagram (15). Set M146 telescope mount (24) elevation dial (25) and deflection scale dial (26) to elevation 4, azimuth 4. Be careful not to move deflection knob (22) or elevation knob (23) when setting elevation dial and deflection scale dial. Howitzer is now boresighted. M118A2/M118A3 ELBOW TELESCOPE RETICLE LAID ON AIMING DIAGRAM BUTTERFLY 2-176