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 245 of 775

TM 9--2350--311--10

Change 6

2--147

2--11 OPERATION OF FIRE CONTROL EQUIPMENT UNDER NORMAL CONDITIONS

— CONTINUED

2--11.2

M118A2/M118A3 Elbow Telescope and M146 Telescope Mount — Continued

d. Quick Alinement of 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.

NOTE

•

To assure the M140/M140A1 alinement device is in collimation and can be used for quick

alinement procedure, the fire control instruments must first be boresighted using either

distant aiming point method or test target method (para 2--12.2). Paragraph 2--12.2 also

provides procedures for checking the M140/M140A1 alinement device while boresighting

on the test target.

•

M140/M140A1 alinement device is used to aline M118A2/M118A3 elbow telescope with

cannon tube.

1

Gunner removes M140/M140A1 alinement device (23) from stowage and hands it to driver.