TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 505 of 775

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