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|  MIL-T-45379D(AT)
4.6.4.9.2 System backlash. To determine conformance to 3.5.9.2, the backlash test shall be
conducted using the gunner's telescope to measure the amount of backlash. A perpendicular
force of 70 lbf ft shall be applied approximately 20 in from the muzzle end of the gun and
exerted first in the traverse plane of rotation and then in the elevation plane. Backlash is the
angular movement of the gun in traverse and elevation when the applied force is reversed.
Before conducting this test, assure that the backlash has been adjusted according to the
installation drawing.
4.6.4.9.3 Turret and gun control system. Prior to performing the tests of 4.6.4.9.3 through
4.6.4.9.3.17.3, vehicles shall be completely assembled, serviced with applicable fluids, and
lubricants but need not be combat loaded. The following conditions shall also be met.
a. Preliminary examination of nitrogen pressure and oil level.
b. Verification of alternator voltage inspection.
c. The turret shall be level within 1 except for slope tests and moving vehicle tests.
After tests, the vehicle shall be examined for leaks and workmanship deficiencies possibly
caused by operation. The turret and electrical system shall be as specified in 3.5.9.3 during these
tests.
4.6.4.9.3.1 Gun elevation speeds. Tests shall be conducted to determine the elevation and
depression controllability over the speed ranges specified in 3.5.9.3.1. Tests shall be conducted
for both the stabilized and non-stabilized modes with both the gunner and commander power
handles.
4.6.4.9.3.2 Turret traversing speeds. The turret shall be tested for controllability over the
speed ranges specified in 3.5.9.3.2. Tests shall be conducted while operating in the stabilized
mode and again in the non-stabilized mode, with gunner and commander power controls, and in
both directions of turret rotation. The accumulator shall be fully charged prior to maximum
traverse speed tests. Maximum speeds shall be checked by allowing the turret to accelerate
approximately 400 mils from stop and observing the time required to complete the next
3200 mils (1/2 revolution) of traverse. The main gun shall be at zero elevation or above during
these tests. Tests for gunner's handle displacement shall be conducted in both the stabilized
and non-stabilized mode in both directions of rotation. Performance shall be as specified in
3.5.9.3.2.
4.6.4.9.3.3 Gun laying on stationary target, vehicle stationary. To determine conformance to
3.5.9.3.3, tests shall be performed in accordance with the following:
a. Tests with the gunner's controls shall be conducted with the vehicle operating in the
power mode. Tests with the commander's controls shall be conducted with the
vehicle operating in the stabilized mode. Tests with the manual controls shall be
conducted from the gunner's position only.
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