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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).
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