d. The main gun shall be clamped into the external travel lock and the internal turret
lock shall be tested for capability of being placed in the locked position. Upon
locking, the turret traverse controls shall be actuated and the turret shall remain
188.8.131.52.4.10 Control system deadspot. To determine conformance to 184.108.40.206.10, the
gunner's and the commander's 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 or turret has begun to move.
220.127.116.11.4.11 Main gun manual control.
18.104.22.168.4.11.1 Traverse effort. To determine conformance to 22.214.171.124.11.1, a force gage
shall be attached to the hand traverse crank and the turret traversed with the hand crank,
observing the effort required to maintain turret movement. The force shall be measured in each
direction of rotation at four points throughout 360 degrees of rotation (one in each quadrant); the
mean force required shall not exceed 17 lb with no individual reading exceeding 20 lb.
126.96.36.199.4.11.2 Elevation effort. To determine conformance to 188.8.131.52.11.2, 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 46 in-lb mean torque with no
individual reading exceeding 55 in-lb.
184.108.40.206.4.11.3 Elevation response rate. To determine conformance to 220.127.116.11.11.3, the main
gun hand elevation crank shall be rotated at the rate of 10 to 20 rpm while observing a mil-scale
target through the gunner's periscope, the measured response rate shall be not less than 10 mils
per revolution of the handle.
18.104.22.168.4.12 Power and manual control. To determine conformance to 22.214.171.124.12, the
following tests shall be conducted: The gun shall be elevated and depressed with the gunner's
power control while traversing the turret with the manual controls. The gun shall be elevated
and depressed by manual control while traversing the turret with the gunner's power control.
The elevation and traverse power switch shall be turned on and off not less than 3 times and the
gun observed for movement. Gun movement shall not exceed the specified amount. The gun
firing switches shall be tested and shall operate as specified.
126.96.36.199.4.13 Superelevation actuator. To determine conformance to 188.8.131.52.13, the gunner's
periscope reticle shall be laid on a convenient target with the computer set at zero superelevation
and the servo switch off. HEP-T, M393 ammunition shall be selected on the computer, and the
range scale rotated to 3000 meters. With the servo switch on, and after automatic transmission
of superelevation has been accomplished, the gunner's reticle shall be on target within the limits