TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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3-7 FIRE CONTROL ALINEMENT TESTS AND MEASUREMENTS — CONTINUED 3-7.5 Leveling the Cannon Tube— Continued TM 9-2350-311-10 a. Leveling the Cannon Tube Using the Cannon Tube Leveling Fixture (If Required) — Continued 5 Be sure cannon tube (2) is dry and clean. Insert the cannon tube leveling fixture (4) into muzzle brake (12) end of the cannon tube to the point at which the magnet base stop (11) contacts the face of the cannon tube. Be sure the magnet base stop is flush with the cannon tube. 6 Rotate the cannon tube leveling fixture (4) until the cross-level vial (9) bubble centers. 7 Place a pre-tested M1A1 gunner’s quadrant (13) set at 0 (with corrections applied if applicable) in the groove (14) of the cannon tube leveling fixture (4) with LINE OF FIRE arrow (15) pointing to muzzle brake (12) end. 3-95