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 3-7 FIRE CONTROL ALINEMENT TESTS AND MEASUREMENTS — CONTINUED 3-7.6 M17/M117A2 Panoramic Telescope Reliability Testing — Continued b. Testing Reliability of Special Corrections — Continued 5 Now check the following: (a) The line of sight must be on the reference point (6). (b) The reading on the azimuth counter (7) should not change by more than 1/4 mil. (c) The reset counter (8) should be changed by 10 mils. 6 Repeat the steps in 4 and 5 for 20, 30, and 40 mils. 7 Repeat the steps in 4, 5, and 6 above using the right gunner’s aid counter (5) instead of the left. 8 If checks are not as stated in 5 (a), (b), and (c) above, the M117/M117A2 panoramic telescope (1) is out of adjustment and should be reported to unit maintenance. 3-101