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|  MIL-T-45379D(AT)
4.6.4.6.5 Inflatable seal and pump. To determine conformance to 3.5.6.5, a force gage shall
be attached to the pump plunger and pump actuated to arrive at the specified pressure as
indicated on the inflatable seal pressure gage. The maximum force shall be not more than that
specified. The indicated pressure loss during a 30-minute period shall not exceed 5 psi.
CAUTION: THE PRESSURE SHALL BE RELIEVED AT THE CONCLUSION OF THIS
TEST.
4.6.4.6.6 Drain valves. To determine conformance to 3.5.6.6, a force gage shall be attached
to the end of the handgrip of the front valve lever and actuated as specified. The rear valve lever
shall also have the gage attached and actuated as specified. The front and rear drain valve levers
shall operate at the force specified and the valves checked for functional and dimensional
requirements.
4.6.4.7 Trench crossing. The vehicle shall be driven at a speed not to exceed 5 mph without
stalling over trenches as specified in 3.5.7. The main gun shall be in the forward, fully elevated
position. After the test, the vehicle shall be examined for damage.
4.6.4.8 Vertical obstacles. The vehicle shall be driven forward at a speed not to exceed
5 mph without stalling over vertical obstacles as specified in 3.5.8. The main gun shall be in the
forward, full elevated position. After the test, the vehicle shall be examined for damage.
4.6.4.9 Turret/cupola.
4.6.4.9.1 Nylon ballistic shield. To determine conformance to 3.5.9.1, the following tests
shall be performed concurrently with synchronization tests of 4.6.4.9.5.1:
a. Coaxial machine gun deflection. With the 105mm gun on its zero aiming point, a
simulated machine gun containing a centering aperture shall be installed in the
machine gun mount. The mount shall be adjusted to boresight position while viewing
the coaxial machine gun target through the centering hole in the simulated machine
gun. A deflection measuring device shall be mounted to the gun shield and coaxial
machine gun deflection shall be checked at 105mm gun elevation of plus 20 and
minus 10.
b. Gunner's telescope sighting system deflection. With the gunner's telescope set
initially in its boresight position, deflection shall be tested by observing the gunner's
telescope targets located at plus 15 and minus 5 on the target stand, as the main gun
muzzle telescope reticle is superimposed on its appropriate targets.
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