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 276 of 775

TM 9--2350--311--10

2--178

Change 6

2--12 PREPARATION FOR FIRING — CONTINUED

2--12.2

Boresighting — Continued

c. Checking M140/M140A1 Alinement Device While Boresighting on Test Target — Continued

4

Check alinement of M140/M140A1 alinement device (27) reticle against reticle of M117/M117A2

panoramic telescope (18) laid on left hand butterfly aiming diagram (15) of test target. Reticles should

aline within 0.5 mil.

5

Remove M140/M140A1 alinement device (27) from in front of panoramic telescope ballistic cover (29)

and install on dovetail door wedge (28) in front of M42 tank periscope (30) cover door (31).