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)

3.5.9.6.4 Ammo select. Upon system turn-on APDS ammunition shall be automatically selected (see 4.6.4.9.6.4).

3.5.9.7 Indirect fire control.

3.5.9.7.1 Elevation quadrant. At zero gun elevation and with the bubble centered in the level vial, the knob scale and the index scale shall be adjusted to read zero. The reading on the elevation quadrant shall correspond to the position of the gun within plus or minus 1 mil at all angles of elevation and depression (see 4.6.4.9.7.1).

3.5.9.7.2 Azimuth indicator backlash. The backlash of the azimuth indicator shall not exceed 0.5 mil at any position of the turret (see 4.6.4.9.7.2).

3.5.9.7.3 Leveling devices. The level on the ballistic drive shall be level within 15 minutes (three graduations) when the gun is at the boresight position and the ballistic drive superelevation input shaft is at the position specified on the ballistic drive input shaft qualification plate

(see 4.6.4.9.7.3).

3.5.9.8 Cupola weapon sighting system.

3.5.9.8.1 Synchronization. The line of sight shall be synchronized with the cupola machine gun so that the line of sight of the commander's periscope AN/VSG-2 maintains a given azimuth and elevation relationship (established at horizontal gun position) with the centerline of the machine gun bore within 1.8 mils at all gun positions between 10° depression and 30° elevation, and within 3 mils at all gun positions between 30° elevation and 50° elevation (see 4.6.4.9.8.1).

3.5.9.8.2 Elevation backlash. The elevation backlash of the cupola machine gun sighting system shall be not more than 0.6 mils at any position, exclusive of machine gun free barrel movement (see 4.6.4.9.8.2).

3.5.9.8.3 Boresight knob travel. The boresight knobs on the periscope shall be adjustable to not less than 5 mils down, 2 mils up, 4 mils left and 4 mils right, as measured from the boresight position (see 4.6.4.9.8.3).

3.5.9.8.4 Boresight retention. The line of sight of the commander's periscope shall maintain previously established boresight within 1.5 mils (see 4.6.4.9.8.4).

3.5.9.8.5 Interlock assembly location. The interlock assembly shall be located for azimuth coincidence of the machine gun line of sight and the main armament line of sight at 1200 m within 2 mils (see 4.6.4.9.8.5).