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 277 of 775

TM 9--2350--311--10

Change 6

2--179

2--12 PREPARATION FOR FIRING — CONTINUED

2--12.2

Boresighting — Continued

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

6

Check alinement of M140/M140A1 alinement device (27) reticle against reticle of M118A2/M118A3

elbow telescope (32) laid on right hand butterfly aiming diagram (15) of test target. Reticles should aline

within 0.5 mil.

7

If M140/M140A1 alinement device (27) does not aline with M118A2/M118A3 elbow telescope (32) or

M117/M117A2 panoramic telescope (18) reticles, notify unit maintenance.