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|  MIL-T-62222(AT)
a. Main gun shall be aligned with its horizontal aiming point by laying from low to high
without overtravel.
b. The line of sight through the gunner's periscope (daylight) and the rangefinder shall
be adjusted to superimpose their reticles on their aiming points.
c. The main gun shall be realigned with its aiming point laying from high to low.
d. The backlash or amount that each line of sight lags shall be measured by noting the
new position of each reticle on its aiming point. Backlash for the periscope and the
rangefinder shall not exceed the amount specified.
e. Backlash shall be checked at main gun positions of zero, plus 5,10, and 15 degrees.
4.6.17.3.6.1.3 Boresight knob travel. To determine conformance to 3.5.3.6.1.3, the boresight
knob travel shall be tested after synchronization requirements have been met. The knob travel
shall be measured from a position established with the gun line of sight on its horizontal aiming
point laying from low to high and each reticle on its horizontal aiming point. Boresight knob
travel shall be as specified.
4.6.17.3.6.1.4 Unity sight knob travel. To determine conformance to 3.5.3.6.1.4, place the
unity reticle on its horizontal aiming point using the boresight knobs in conjunction with
4.6.17.3.6.1.3. From this position, rotate the elevation and deflection boresight knobs from stop
to stop and verify that the total travel is as specified.
4.6.17.3.6.1.5 Boresight retention. To determine conformance to 3.5.3.6.1.5, testing shall be
conducted in accordance with the following procedure:
a. Prior to the eight mile road test, the vehicle shall be positioned at least 1200 meters
from a clearly defined target.
b. With the computer set for 1200 meters, boresight mode of operation, the main gun
shall be aligned on target laying from low to high.
c. The gunner's periscope reticle, the gunner's telescope reticle, and the rangefinder
reticle shall be aligned on target. Boresight knob positions of the sighting instruments
shall be recorded.
d. The eight mile road test shall be performed.
e. The vehicle shall be returned to position established in "a".
f. The main gun shall be aligned on original aiming point, laying from low to high.
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