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|  MIL-T-45379D(AT)
3.5.9.5.1 105mm gun sighting system.
3.5.9.5.1.1 Synchronization. The line of sight in the gunner's periscope, telescope, and
commander's rangefinder shall move in synchronization with the centerline of the main gun
within the tolerance specified in table VII.
TABLE VII. Synchronization.
Gun
Gunner's
Periscope
Telescope
Rangefinder
position
elevation
deflection
Elevation
Deflection
Elevation
Deflection
-5
+ 0.3 mil
+ 0.3 mil
+ 0.1 mil
+ 0.1 mil
+ 0.3 mil
+ 0.3 mil
0
Boresight
Boresight
Boresight
Boresight
Boresight
Boresight
+5
+ 0.3 mil
+ 0.3 mil
+ 0.1 mil
+ 0.1 mil
+ 0.3 mil
+ 0.3 mil
+10
+ 0.3 mil
+ 0.3 mil
+ 0.1 mil
+ 0.1 mil
+ 0.3 mil
+ 0.3 mil
+15
+ 0.3 mil
+ 0.3 mil
+ 0.1 mil
+ 0.1 mil
+ 0.3 mil
+ 0.3 mil
3.5.9.5.1.2 Elevation backlash. Elevation backlash in the gunner's periscope shall not
exceed 0.3 mil for any gun position from 10 depression to 20 elevation. Elevation backlash in
the commander's rangefinder shall not exceed 0.3 mil for any main gun position from 10
depression to 20 elevation (see 4.6.4.9.5.1.2).
3.5.9.5.1.3 Boresight knob travel. The main gun boresight knobs on the gunner's periscope
(daylight and night vision channels) shall be adjustable, to at least 4 mils down, 2 mils up, 3 mils
left and 3 mils right. The boresight knobs on the telescope shall be adjustable to at least 5 mils
down, 2 mils up, 4 mils left and 4 mils right. The boresight knobs on the commander's
rangefinder shall be adjustable to at least 3.5 mils up, 3.5 mils down, 3.5 mils left, and 3.5 mils
right. Knob travel adjustment shall be as measured from the boresight position
(see 4.6.4.9.5.1.3).
3.5.9.5.1.4 Thermal vision channel. Actuation of the mode switch on the gunner's display
unit to the ON position shall provide thermal sight viewing at the gunner's and commander's
display units. The gunner shall be capable of controlling thermal and reticle image brightness
and contrast, narrow field of view (NFOV) or wide field of view (WFOV), and image polarity.
The thermal and reticle image brightness and contrast shall be maximum with their controls in
the extreme clockwise position. Actuation of the gunner's/commander's switch on the
commander's display unit to the "COMMANDER" position shall permit the commander to
override and control brightness, contrast and polarity (see 4.6.4.9.5.1.4).
3.5.9.5.1.5 Unity sight knob travel. Rotation of the unity channel boresight sight knobs on
the gunner's periscope in elevation and in deflection from stop-to-stop shall cause the reticle to
travel at least 20 mils on each axis (see 4.6.4.9.5.1.5).
20
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