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 320 of 775

TM 9-2350-311-10

2-12 PREPARATION FOR FIRING — CONTINUED

2-12.6

Laying For Direction and Quadrant During Indirect Fire Mission — Continued

d.

Laying for Elevation Using M15 Elevation Quadrant

NOTE

M15 elevation quadrant is shown removed for clarity.

1

Upon announcement or data display of “QUADRANT (SO MUCH),” assistant gunner rotates elevation

knob (15) until announced quadrant appears on elevation counter (16). Assistant gunner then reads

setting to chief of section.

NOTE

Each time cab is traversed or cannon is elevated or depressed, assistant gunner must repeat

steps 2 and 3.

2

Assistant gunner elevates or depresses cannon until elevation level (17) bubble centers,

3

Assistant gunner turns cross-level knob (18) to center cross-level (19) bubble.

4

After gunner has traversed howitzer, assistant gunner verifies that cross-level (19) and elevation level

(17) bubbles are centered, and the announced or displayed quadrant appears on elevation counter (16).

Assistant gunner then announces, “SET.”

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