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|  MIL-T-62222(AT)
4.6.17.2.5.1 Holding. To determine conformance to 3.5.2.5.1, a load of 6000 lb shall be
placed on the vehicle in a position that will not restrict the flow of engine air (intake or exhaust).
The vehicle shall be driven up a 60 percent dry, hard grade and the service brakes checked, and
then the parking brakes checked for conformance. Checks shall be made with the vehicle headed
up and down grade.
4.6.17.2.6 Turning. To determine conformance to 3.5.2.6, the vehicle shall be operated and
turned to right and to the left in full 360 degree pivot turn in neutral steer and checked for
functional requirements. During this test, the vehicle shall be brought to a full stop before
reversing the turning direction. The full turns shall be accomplished within a 35 ft diameter
circle.
4.6.17.2.7 Fording.
4.6.17.2.7.1 Shallow water. To determine conformance to 3.5.2.7.1, the chassis shall be
driven into water of specified depth with engine the compartment drain valve open and without
special equipment. During and after this period, water accumulation in the crew compartment
hull floor shall not be more than specified depth.
4.6.17.2.7.2 Drain valves. To determine conformance to 3.5.2.7.2, 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.
4.6.17.2.7.3 Turret inflatable seal and pump. To determine conformance to 3.5.2.7.3, 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.
4.6.17.2.7.4 Engine start - shallow water. To determine conformance to 3.5.2.7.4, the engine
starting capability shall be checked during shallow water operation. The engine shall be idled at
1000 rpm for 15 minutes, stopped and restarted in not more than 3 minutes with all accessories
functioning satisfactorily during and after test.
4.6.17.2.7.5 Deep water. To determine conformance to 3.5.2.7.5, when a fording kit is
specified, the vehicle with kit installed shall be driven into a hard bottom body of water
96 inches in depth and remain at that depth for 30 minutes. The accumulation of water shall be
checked and shall be not more than 2 inches on the crew compartment hull floor in the center of
the "V".
4.6.17.2.8 Trench crossing. To determine conformance to 3.5.2.8, the vehicle shall be driven
at a speed not to exceed 5 mph without stalling over trenches as specified. The main gun shall be
in the forward, fully elevated position. After the test, the vehicle shall be examined for damage.
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