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 257 of 775

TM 9--2350--311--10

Change 6

2--159

2--12 PREPARATION FOR FIRING — CONTINUED

2--12.1

Pre-Firing Emplacement — Continued

b. Laying the Howitzer Using the M2/M2A2 Aiming Circle

NOTE

Gunner uses M117/M117A2 panoramic telescope to lay howitzer for direction.

1

Upon gunnery sergeant’s command, “BATTERY ADJUST AIMING POINT THIS INSTRUMENT,”

gunner uses door release (33) to lift access door (34) covering azimuth counter (35) on M117/M117A2

panoramic telescope (36).

2

Gunner ensures bubbles in pitch level (37) and cross-level (38) on M145/M145A1 telescope mount (39)

are centered and gunner’s aid counters (40) are set at ZERO.

3

Assistant gunner sets 0--300 mils on M15 elevation quadrant (41), then depresses or elevates cannon

tube (not shown) until elevation level (42) bubble centers. Ensure that elevation level and cross-level

(43) bubbles are centered throughout laying process.

33

34

35

36

37

38

39

40

41

42

43