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|  MIL-T-45379D(AT)
3.5.9.1.12 Travel locks. With the gun external travel lock and the turret lock disengaged, the
turret and gun control system shall act as a holding device for the gun and turret when the vehicle
is in motion. With the vehicle moving at a rate of 5 mph in low on a horizontal hard surface road
and with the elevation and traverse power switch off, the turret slippage shall not exceed 10 mils
in traverse when subjecting the vehicle to a full steer 90 turn in either direction and coming to a
sudden stop. With the vehicle moving at a rate of 20 mph on a horizontal hard surface road and
with the elevation and traverse power switch on or off, the gun slippage shall not exceed 5 mils
in elevation or depression when stopping the vehicle within 60 ft from the point of vehicle brake
application. With the hand traverse crank out of detent there shall be no more than 360
movement of the hand traverse crank without engaging the detent nor shall the hand elevation
crank show any movement by either turret induced reaction when the vehicle is in motion as
specified herein or by power operation of the turret and gun control system. With the gun in
external travel lock, the turret lock shall be capable of being placed in the locked position.
Engagement of the turret lock shall prevent traversing of the turret in any direction
(see 4.6.4.9.3.12).
3.5.9.3.13 Stabilization aim retention.
3.5.9.3.13.1 Azimuth. While operating in the stabilized mode, the control system shall
automatically retain the azimuth aim within 9 mils during pivot steer operations at the specified
rate and shall return to the original azimuth within 5 mils after completing the pivot steer. This
requirement is applicable to hull rotations of 45 or less, at a speed of 4.5 to 9 per second, and
shall be met for both clockwise and counterclockwise rotation (see 4.6.4.9.3.13.1).
3.5.9.3.13.2 Elevation. While operating in the stabilized mode, the control system shall
automatically retain the elevation aim to within 6 mils during vehicle pitching motions at a rate
of 5 to 8 per second, and shall return to the original elevation within 3 mils after hull motion
ceases (see 4.6.4.9.3.13.2).
3.5.9.3.14 Control system deadspot. The turret and gun control system deadspot, as
measured at the gunner's power control, shall not exceed 7 handle movement from the neutral
center position in any direction to initiate gun and turret movement. Deadspot at the
commander's power control shall not exceed 14 handle movement from the neutral center
position in the traverse direction and 7 handle movement from the neutral center position in
elevation. The neutral center position shall be defined as that handle position which divides the
initial free handle movement (backlash of linkages) in half. The deadspot angles on each side of
the neutral center in the traverse axis shall be equal within 2, and the deadspot angles in the
elevation axis shall be equal within 2 for both the gunner's and commander's power controls.
These requirements apply to both stabilized and non-stabilized operation (see 4.6.4.9.3.14).
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