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 286 of 775

TM 9--2350--311--10

2--188

Change 6

2--12 PREPARATION FOR FIRING — CONTINUED

2--12.2

Boresighting — Continued

f.

Comparison Test of the M140/M140A1 Alinement Device — Continued

NOTE

Correct azimuth reading is 3200 mils.

4

To determine which M140/M140A1 alinement device (27) is unserviceable, obtain a third M140/M140A1

alinement device and check boresight of weapon again.

5

Without changing azimuth reading, install each of the other two M140/M140A1 alinement devices (27).

The M140/M140A1 alinement device on which reticles will not aline with M117/M117A2 panoramic

telescope (18) reticle is defective. Turn in defective M140/M140A1 alinement device to unit

maintenance for repair.