C9, TM 9-2350-230-12
TABLE 2-9.1. ZEROING M119 OR M127 TELESCOPE AND XM44 SERIES PERISCOPE
STEP
PROCEDURE
FIG/ITEM
1
Perform procedures described in table 2-9, steps 1 through 32.
2
Apply emergency zero to telescope by turning boresight knobs (CONV)
to elevation "5" and azimuth "2".
3
Select a well-defined point in the target area at a range of 1200 meters
(use a 12 x 12 ft target when possible).
4
Select CONV on the gun and turret control selector.
5
Using the manual controls, lay the zeroing cross of the-telescope
(1200 meters range line) on the aiming point.
6
Fire a warmer round, followed by three rounds of the same lot number,
to form a shot group. Re-lay the gun on the same aiming point after
each round, using the manual controls.
7
When firing has been completed, re-lay the sight on the aiming point.
8
Without disturbing the lay of the gun, using the telescope boresight
knobs (CONV) move the zeroing cross (1200 meter range line) to the
center of the shot group.
9
Re-lay on the aiming point, using the manual controls and fire a check
round. The projectile should strike within 24 inches of the aiming point.
If it does not, fire a second check round. If either round strikes within
the specified distance from the aiming point, the gun is zeroed. If not,
the zeroing procedure is continued until a check round strikes within
the prescribed distance.
10
With the gun-launcher zeroed, and using the manual controls, lay the 2-19
telescope zeroing cross back on aiming point.
11
Using the boresight knobs on the periscope, move the reticle
pattern 1200 meter range line to same aiming point as the telescope.
12
A check round may be fired, using periscope to verify that
the periscope is zeroed.
13
Record zero setting of the telescope and periscope, and place in
convenient part of the turret.
14
Slip scales on telescope (CONV) and gunner's periscope boresight
knobs to position "4".
2-38.2
