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|  MIL-T-45379D(AT)
4.6.4.9.3.13 Stabilization aim retention.
4.6.4.9.3.13.1 Azimuth. To determine conformance to 3.5.9.3.13.1, the following test shall
be conducted:
With the vehicle on level ground and operating in the stabilized mode, the vehicle shall
be put into a right-pivot steer of approximately 45 at a speed of 4.5 to 9 per second and
brought to a smooth stop. Just prior to the start of the pivot steer, the aiming point of the
gunner's periscope reticle shall be alined on a clearly defined target at least 1000 m
distant. During the pivot, the point of aim shall remain on target within 9 mils and at the
end of pivot shall return to within 5 mils of the original point of aim. The test shall be
repeated in a 45 left-pivot steer.
4.6.4.9.3.13.2 Elevation. To determine conformance to 3.5.9.3.13.2, the following test shall
be conducted:
The vehicle shall be positioned on a slope not to exceed 15 with the front of the vehicle
down slope and with the brakes engaged, with the turret operating in the stabilized mode,
the aiming point of the gunner's periscope reticle shall be alined on a clearly defined
target at least 1000 m distant. The brakes shall be released and the vehicle allowed to
coast down the slope to a level position causing vehicle attitude to change at a rate of 5 to
8 per second. During vehicle motion, the point of aim shall remain on target within
6 mils and when vehicle motion ceases shall return to within 3 mils of the original point
of aim.
4.6.4.9.3.14 Control system deadspot. To determine conformance to 3.5.9.3.14, the gunner
and the commander controls shall be operated as specified and the deflection of the control
handles to initiate continuous movement of the gun in the test direction shall be measured with
appropriate inspection equipment. When measuring the deadspot angle, the controls shall not be
moved toward the neutral center once the gun and turret have begun to move.
4.6.4.9.3.15 105mn gun manual control.
4.6.4.9.3.15.1 Traverse effort. To determine conformance to 3.5.9.3.15.1, a torque gage
shall be attached to the hand traverse crank shaft and the turret traversed with the torque gage,
observing the effort required to maintain turret movement. The force shall be measured in each
direction of rotation at four points throughout 360 of rotation (one in each quadrant). The
torque required to maintain turret motion shall not exceed 76 lbf in.
4.6.4.9.3.15.2 Elevation effort. To determine conformance to 3.5.9.3.15.2, a torque gage
shall be attached to the hand elevation crank and the torque required to maintain uniform
movement shall be measured. The torque reading shall not exceed 45 lbf in mean torque with no
individual reading exceeding 55 lbf in.
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