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|  MIL-T-62222(AT)
3.5.3.5 Cupola control.
3.5.3.5.1 Traverse effort. The required starting torque, for right or left traverse, shall be not
more than 40 in-lb to start motion from any position within 360 degrees rotation
(see 4.6.17.3.5.1).
3.5.3.6 Gun fire control system. The gun fire control system shall operate and meet all
requirements specified herein (see 4.6.17.3.6).
3.5.3.6.1 Main gun sighting system.
3.5.3.6.1.1 Synchronization. The line of sight of the telescope and the gunner's periscope,
(daylight system only) and the left line of sight of the rangefinder, shall move in synchronization
with the centerline of the gun tube bore within plus or minus 0.3 mil in both elevation and
deflection in all positions from horizontal to 15 degrees elevation. The gun tube bore centerline
at 15 degrees elevation shall be within 0.5 mil of a plane which is perpendicular to the plane of
traverse and coincident with the line of the gun when the gun is at zero elevation
(see 4.6.17.3.6.1.1).
3.5.3.6.1.2 Elevation backlash. The elevation backlash in the sighting system shall not
exceed 0.3 mil for any gun elevation throughout the entire range of elevation and depression
(see 4.6.17.3.6.1.2).
3.5.3.6.1.3 Boresight knob travel. The boresight knobs on the gunner's periscope, the
rangefinder and the telescope mount shall be adjustable, to a minimum of 5 mils down, 2 mils
up, 4 mils left, and 4 mils right as measured from the boresight position (see 4.6.17.3.6.1.3).
3.5.3.6.1.4 Unity sight knob travel. The rotation of the gunner's utility sight knobs in
elevation and deflection from stop to stop shall cause the reticle to travel 20 mils
(see 4.6.17.3.6.1.4).
3.5.3.6.1.5 Boresight retention. The gunner's periscope, commander's rangefinder, and the
telescope shall maintain previously established boresight within the values in table VII
(see 4.6.17.3.6.1.5).
TABLE VII. Boresight retention.
Periscope
Rangefinder
Telescope
Elevation
Deflection
Elevation
Deflection
Elevation
Deflection
0.25 mil
0.25 mil
0.25 mil
0.25 mil
0.25 mil
0.25 mil
19
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