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|  MIL-T-45379D(AT)
4.6.4.9.5.1.4 Thermal vision channel. To determine conformance to 3.5.9.5.1.4, actuate the
gunner's display unit mode switch to ON, and view a distant target image at least 5F above
ambient temperature. Verify that the target image is viewable at both the gunner's and
commander's display units. Verify on the gunner's display unit that: 1) Thermal and reticle
image brightness is maximum with their controls in the extreme clockwise position, 2) Image
polarity is reversed when polarity switch is changed, and 3) Field of view changes upon
actuation of the field-of-view lever. Actuate the gunner's/commander's switch on the display
unit and verify override and control capabilities of the commander for brightness, contrast and
polarity.
4.6.4.9.5.1.5 Unity sight knob travel. To determine conformance to 3.5.9.5.1.5, place the
unit reticle on the 1200 m distant aiming point described in 4.6.4.9.5.1.3, using the gunner's
unity sight knobs. From this position, rotate the unity knobs in elevation and then in deflection
from stop to stop, and determine the total knob travel.
4.6.4.9.5.1.6 Boresight retention. To determine conformance to 3.5.9.5.1.6, testing shall be
conducted in accordance with the following procedure.
a. Prior to the 8-mile road test, the vehicle shall be positioned at least 1200 m from a
clearly defined target.
b. With the computer set for 1200 m boresight mode of operation, the 105mm gun shall
be alined on target laying from low to high.
c. The gunner's periscope daylight reticle, the gunner's telescope reticle, and the
rangefinder reticle shall be alined on target. Boresight knob positions of the sighting
instruments shall be recorded.
d. The 8-mile road test shall be performed.
e. The vehicle shall be returned to the position established in a.
f. The 105mm gun shall be alined on the original aiming point, laying from low to high.
g. The boresight knob (excluding boresight knob backlash) of each sighting instrument
shall be used, if necessary, to reposition their reticles on the original aiming point.
Any loss of boresight retention shall be noted by the new boresight knob position and
shall not exceed the limits specified.
4.6.4.9.5.2 Laser rangefinder (LRF). Prior to conducting the acceptance tests described
below, the laser rangefinder shall be disabled as a safety precaution to prevent possible eye
damage from the laser beam. Disablement can be accomplished by covering the LRF exit
window or by installation of a special test cable which interrupts the trigger signals to the laser
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