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 313 of 775

TM 9--2350--311--10

Change 6

2--215

2--12 PREPARATION FOR FIRING — CONTINUED

2--12.6

Laying For Direction and Quadrant During Indirect Fire Mission

NOTE

Laying howitzer for direction and quadrant during indirect fire missions is the duty of gunner and

assistant gunner, respectively. These operations are normally done at same time.

a. Laying for Direction Using M1A1/M1A2 Collimator

WARNING

The M1A1/M1A2 collimator is radioactively illuminated. Check for presence of illumination and

damage. If discovered broken, damaged, or defective, follow the procedures on pages b and c.

1

Upon announcement or data display of “DEFLECTION (SO MUCH),” gunner rotates M117/M117A2

panoramic telescope (1) azimuth knob (2) until announced deflection appears in reset counter (3).

Gunner then reads setting to chief of section.

2

Sighting through M117/M117A2 panoramic telescope (1) eyepiece (4), gunner traverses howitzer until a

proper sight picture on aiming point is achieved.

NOTE

Each time howitzer is traversed or cannon tube is elevated or depressed, gunner must repeat

steps 2 and 3 before alining M117/M117A2 panoramic telescope on any aiming reference point.

3

Gunner centers pitch level (5) and cross-level (6) on M145/M145A1 telescope mount (7).

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5

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