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 2-11 OPERATION OF FIRE CONTROL EQUIPMENT UNDER NORMAL CONDITIONS — CONTINUED 2-11.1 M117/M117A2 Panoramic Telescope and M145/M145A1 Telescope Mount — Continued b. Description of M117/M117A2 Panoramic Telescope and M145/M145A1 Telescope Mount Components 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Direct fire bar knob (3) allows deflection changes in 5 mil increments for direct fire. Azimuth knob (4) sets azimuth counter (5) and reset counter (6) when turned and allows M117/M117A2 panoramic telescope (1) head to be rotated. Cross-level mechanism knob (7) centers cross-level (8) when turned. Gunner’s aid knob (9) sets gunner’s aid counters (10) when turned. Gunner’s aid counters (10) provide visual correction factor for individual weapon. Boresight detent shaft (11) is used to change mil reading of azimuth counter (5) during boresighting. Pitch level (12) is used for leveling. Cross-level (8) is used for leveling. Elevation handwheel (13) sets elevation counter (14) when turned. Elevation counter (14) shows quadrant. Correction counter (15) registers correction value for individual weapon in mils. Correction knob (16) sets correction counter (15) when turned. Pitch knob (17) centers pitch level (12) when turned. Level (18) is used for leveling. Quadrant support assembly knob (19) centers quadrant support assembly level (20) when turned. Quadrant support assembly level (20) is used for leveling. Toggle switch (21) turns on lamps when pushed up. Reset knob (22) resets the reset counter (6) when pushed in and turned. Reset counter (3200 mil) (6) registers azimuth travel in mils. Azimuth counter (6400 mil) (5) registers azimuth travel in mils. Door release (23) opens azimuth counter (5) access door when moved to the right. 2-136