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


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