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 283 of 775

TM 9--2350--311--10

Change 6

2--185

2--12 PREPARATION FOR FIRING — CONTINUED

2--12.2

Boresighting — Continued

e. Checking Boresight of the M118A2/M118A3 Elbow Telescope Using the M140/M140A1 Alinement

Device — Continued

NOTE

Always check to see that bubble is centered in level vial of M118A2/M118A3 elbow telescope

every time you elevate or traverse.

3

Aline cant correction scribe lines (36) and sight through M118A2/M118A3 elbow telescope (32).

Boresight crosshairs of M118A2/M118A3 elbow telescope should be in alinement with M140/M140A1

alinement device (27).