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|  MIL-T-62222(AT)
switch shall deactivate the hydraulic power pack motor at a control system pressure as indicated
on the gage between 1150 and 1500 psi (see 4.6.17.3.4.7).
3.5.3.4.8 Turret traverse brake. With the elevation and traverse power switch on and with
the turret stationary, there shall be no traverse movement of the turret when the gunner's power
control handle is turned to it stop in either traverse direction without actuating the palm switch in
the gunner's power control handle (see 4.6.17.3.4.8).
3.5.3.4.9 Travel locks. With the gun external travel lock and the turret azimuth 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 gear 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 degrees 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 on brake application. With
the hand traverse crank out of detent there shall be no more than 360 degree 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 azimuth lock shall be capable of being placed in the locked position. Engagement of the
turret azimuth lock shall prevent traversing of the turret in any direction (see 4.6.17.3.4.9).
3.5.3.4.10 Control system deadspot. The turret and gun control system deadspot, as
measured at the gunner's and commander's power controls, shall not exceed 7 degrees handle
movement from the neutral center position in any direction to initiate gun and turret movement.
The neutral center position shall be as defined as that handle position which divides the initial
free handle movement (backlash of linkage) in half. The deadspot angles on each side of the
neutral center in the traverse axis shall be equal within 2 degrees, and the deadspot angles in the
elevation axis shall be equal within 2 degrees (see 4.6.17.3.5.10).
3.5.3.4.11 Main gun manual control.
3.5.3.4.11.1 Traverse effort. The mean force applied tangentially to the hand traverse crank
at a uniform rate to maintain turret movement shall not exceed 17 lb. No individual reading shall
be more than 20 lb (see 4.6.17.3.4.11.1).
3.5.3.4.11.2 Elevation effort. The mean torque required to rotate the hand crank at a uniform
rate to maintain gun movement shall not exceed 46 inch pounds (in-lb). No individual reading
shall be more than 55 in-lb (see 4.6.17.3.4.11.2).
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