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 2-12.3 Standard Angle Method — Continued b. Boresighting Using the Standard Angle Method (Field Situation) — Continued 5 Rotate the M145/M145A1 telescope mount (6) cross-level mechanism knob (7) until the scribe lines on cross-level mechanism knob and cross-level mechanism (8) aline. 6 Rotate the M145/M145A1 telescope mount (6) pitch level knob (9) until scribe lines on pitch level knob and bracket (10) aline. 7 Repeat steps 5 and 6, rotating the pitch level knob (9) and cross-level mechanism knob (7) in a clockwise direction until alinement is achieved. 2-197