C8, TM 9-2350-230-12
TABLE 11-6. SYNCHRONIZATION OF XM44/El PERISCOPE BY OUTDOOR METHOD
Step No.
Procedure
1
Locate vehicle on level ground with rear of vehicle adjacent to an incline or ramp and approximately
1200 meters from a suitable target. The incline should be of an angle so that vehicle can be
positioned with the front end downward approximately 350 mils from horizontal. Target should be
near horizontal line of sight to avoid a large elevation angle.
2
Secure muzzle boresight (black thread) in reference marks on gun muzzle and secure with strap or
3
Open breech and insert breech boresight assembly. Position right telescope of binocular M17A1 over
hole of breech boresight assembly and select a distant aiming point(1200 meters) with sharply
defined vertical and horizontal lines.
4
Prepare the gunner's XM44/E1 periscope for use as follows:
CAUTION: Use XM44/E 1
periscope boresight aid (10516830) when boresighting in
daylight.
Use dark position filter to prevent excessive light from damaging internal components.
a. Open the ballistic shield by depressing handle finger latch, actuating handle and
releasing finger latch. Install boresight aid.
b. Turn periscope light switch on XM44/E 1 periscope control panel to "ON" position.
CAUTION: Do not direct periscope toward sun when periscope is on; excessive
light will damage internal components.
c. Adjust headrest. View through eyepiece and select dark position filter with
filter lever.
d. Turn focus knob to maximum counterclockwise position and turn diopter knob
to obtain sharpest image on screen.
e. View image on screen for proper illumination and move filter lever to provide
f. Turn and adjust XM44E1 periscope control panel rheostat knob clockwise for
proper illumination of reticle pattern.
5
Lay the gun tube on the target aiming point by laying low to high without over-travel.
(Always lay gun low to high to eliminate backlash from the system.)
6
NOTE 1. Both boresight knobs contain spring loaded clutch teeth requiring "pull to
turn" operation. This feature provides accurate boresight retention.
Align vertical center line of reticle on aiming point by use of azimuth
boresight knob (fig. 2-26). Slip scale on face of knob to "4".
2. Both elevation and azimuth knobs have approximately 15 mils of adjustment
or approximately two turns of adjustment. One revolution of the knob is 8
mils. Each line between numbers is 0.1 mil.
11-33