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 327 of 775

TM 9--2350--311--10

Change 4

2--229

2--12 PREPARATION FOR FIRING — CONTINUED

2--12.7

Direct Fire Procedures — Continued

c. Two Man/One Sight System — Continued

3

Assistant gunner sets announced quadrant on elevation counter (14) of M15 elevation quadrant (15).

Assistant gunner then elevates or depresses cannon tube until elevation level (16) bubble is centered

and centers cross-level (17) bubble. When bubbles are centered, assistant gunner announces “SET.”

Assistant gunner continues to elevate or depress cannon tube, keeping bubbles centered, until a

change in fire commands is announced.

d. One Man/One Sight System

1

Duties of chief of section are same as for two man/one sight system, except that when giving fire

command, chief of section announces quadrant instead of range.

2

Gunner lays for both deflection and elevation using M145/M145A1 telescope mount (18) and

M117/M117A2 panoramic telescope (1). Gunner sets announced quadrant on elevation counter (19)

and elevates or depresses cannon tube until elevation level (20) bubble is centered. Gunner then

centers cross-level (2) bubble. With 3200 set on azimuth counter (3), gunner traverses cannon tube

until crosshair of M117/M117A2 panoramic telescope reticle (7) pattern is on target (13) center of mass,

or correct lead is established. When gunner establishes correct sight picture, he commands “FIRE.”

After firing, gunner continues to lay on target until it is destroyed or a subsequent fire command is

issued.

13

15

16

17

14

1

2

3

7

18

20

19