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 274 of 775

TM 9-2350-311-10

2-12

PREPARATION FOR FIRING —

CONTINUED

2–12.2

Boresighting — Continued

b.

Test Target Method — Continued

9

10

11

In order to prevent damage to M118A2/M118A3 elbow telescope, stow against upper stop when

not in use. Do not use as a handhold under any circumstances.

Rotate deflection knob (22) and elevation knob (23) on M146 telescope mount (24) to lay reticle on right

hand butterfly of aiming diagram (15).

Set M146 telescope mount (24) elevation dial (25) and deflection scale dial (26) to elevation 4, azimuth

4. Be careful not to move deflection knob (22) or elevation knob (23) when setting elevation dial and

deflection scale dial.

Howitzer is now boresighted.

M118A2/M118A3 ELBOW

TELESCOPE RETICLE

LAID ON AIMING DIAGRAM

BUTTERFLY

2-176