MIL-T-45379 Tank, Combat, Full-Tracked, 105 Mm Gun, M60A3-TtsThis specification establishes the construction, performance and inspection requirements for M60A3 full-tracked combat tank equipped with a Tank Thermal Sight TTS.

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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.

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).

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