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MIL-T-62222(AT)
4.6.17.2 Power plant and power train. To determine conformance to 3.5.2, the vehicle
power plant and power train shall be operated throughout all gears and speed ranges as specified
herein and checked for functional requirements. The power train, final drives, tracks, suspension
system, and controls shall be checked throughout all speed and steering ranges, and shall perform
as specified. Prior to installation in the vehicle, with the power plant mounted on a test stand,
check engine function, transmission settings, and generator. Assure proper oil is being used for
subsequent testing.
4.6.17.2.1 Speeds.
4.6.17.2.1.1 Level road speeds. To determine conformity to 3.5.2.1.1, the vehicle shall be
operated at a minimum 30 mph speed for not less than 10 minutes and at 2.5 + 0.5 mph for not
less than 12 minutes and checked for function of power plant and power train. The vehicle drift
when travelling between 25 and 30 mph shall be checked to verify performance as specified.
NOTE: When test facilities preclude safe operation at a sustained 30 mph speed, tests for
that speed shall consist of achieving and maintaining 30 mph ten consecutive times
at distances of at least 100 yards.
4.6.17.2.1.2 Grade speeds. To determine conformance to 3.5.2.1.2, the vehicle shall be
operated at a sustained speed of 10 mph while ascending a 10 percent grade and at 20 mph speed
while ascending a 3 percent grade.
4.6.17.2.2 Acceleration. To determine conformance to 3.5.2.2, the vehicle shall be
accelerated from a standing start through a distance of 200 feet and the time checked for
performance as specified.
4.6.17.2.3 Climbing. To determine conformance to 3.5.2.3, each vehicle shall be driven in
forward and reverse gear up an approved 60 percent grade and on a 30 percent side slopes,
engine stopped and restarted and observed for functional fuel system and climbing requirements.
4.6.17.2.4 Engine start on grades and slopes. To determine conformance to 3.5.2.4, the
engine shall start and oil pressure and temperature shall be maintained when operating on
specified grades and slopes with the fuel tanks filled to no more than 50 percent of capacity.
4.6.17.2.5 Braking and drift. To determine conformance to 3.5.2.5, the vehicles shall be
operated at 20 mph on dry, level, hard-surfaced roads without loose material, and stopped as
specified. The results of three consecutive stopping distances shall be averaged to make this
determination. To establish drift, the vehicle shall follow a set line of travel on approaching the
braking point, applying the vehicle brakes at a given point on the line, and without manual steer
correction, bringing the vehicle to a complete stop. The vehicle shall stop within 60 ft of the
braking point. Sidewise departure from a continuation of the line of travel shall not exceed
6.7 percent of the stopping distance.
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