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 314 of 775

TM 9--2350--311--10

2--216

Change 6

2--12 PREPARATION FOR FIRING — CONTINUED

2--12.6

Laying For Direction and Quadrant During Indirect Fire Mission — Continued

a. Laying for Direction Using M1A1M1A2 Collimator — Continued

NOTE

If there is no weapon displacement, gunner’s sight picture should appear centered as shown.

4

To correct for weapon displacement, gunner must match M117/M117A2 panoramic telescope reticle (8)

with M1A1/M1A2 collimator reticle (9). Numbers in M1A1/M1A2 collimator reticle indicate 5-mil

increments. Individual mils are indicated by short lines in V format of pattern. For example, if gunner

sees 10 and 15 in M1A1/M1A2 collimator and reticle pattern slopes upward from right to left, weapon

has experienced right displacement. To compensate for this displacement, gunner matches left portion

of M117/M117A2 panoramic telescope reticle with M1A1 collimator as shown.

5

If gunner sees 10 and 15 in M1A1/M1A2 collimator and pattern slopes upward from left to right, weapon

has experienced left displacement. To compensate for this displacement, gunner matches the right

portion of M117/M117A2 panoramic telescope reticle (8) with M1A1/M1A2 collimator reticle (9), as

shown.

NO DISPLACEMENT

RIGHT DISPLACEMENT

LEFT DISPLACEMENT

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9

8

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