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 282 of 775

TM 9--2350--311--10

2--184

Change 6

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

WARNING

The M140 alinement device is radioactively illuminated. Check for loss of luminescence,

breakage, damage, or defects. If present, follow the procedures on pages b and c.

1

Inspect mating surfaces of M140/M140A1 alinement device (27) and dovetail door wedge (28) for burrs.

Wipe mating surfaces clean. If dovetail door wedge has burrs, notify unit maintenance.

2

Install M140/M140A1 alinement device (27) on dovetail door wedge (28).

2.1

If using ERLS version, depress button (35.1) to activate.