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|  MIL-T-45379D(AT)
4.6.4.3 Speeds.
4.6.4.3.1 Level-road speeds. To determine conformance to 3.5.3.1, the vehicle shall be
operated at maximum speed for not less than 10 minutes and at minimum speed for not less than
5 minutes and checked for function of powerplant and powertrain. Drift shall be not more than
that specified in 3.5.3.3. During the maximum speed test cycle, the vehicle shall maintain a
speed of not less than 30 mph for a distance of 100 yards 10 consecutive times.
4.6.4.3.2 Grade speeds. To determine conformance to 3.5.3.2, the vehicle shall be operated
at a sustained speed of 10 mph while ascending a 10 percent grade and at a 20 mph speed while
ascending a 3 percent grade.
4.6.4.3.3 Level road drift. To determine conformance to 3.5.3.3, the vehicle drift shall be
checked at break-in (see 4.6.3) when traveling between 25 and 30 mph.
4.6.4.3.4 Acceleration. To determine conformance to 3.5.3.4, the vehicle shall be
accelerated from a standing start through a distance of 200 ft and the time checked for
performance as specified.
4.6.4.3.5 Climbing. To determine conformance to 3.5.3.5, the vehicle shall be driven in
forward and reverse gear up an approved 60 percent grade and on 30 percent side slopes, engine
stopped and restarted and observed for functional fuel system and climbing requirements. This
test may be performed in conjunction with 4.6.4.4.
4.6.4.3.6 Engine starting on grades and slopes. To determine conformance to 3.5.3.6, 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.
This test may be performed in conjunction with 4.6.4.3.4 and 4.6.4.4.
4.6.4.4 Braking and drift.
4.6.4.4.1 Stopping. To determine conformance to 3.5.4.1, 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 and drift distances shall be averaged to make this
determination. To determine drift, the tank shall be stopped within the specified 60 ft braking
distance without manual steering corrections. The distance from the line of travel established at
the time braking is initiated shall not exceed 4 feet per 60 feet of measured braking distance.
4.6.4.4.2 Holding. To determine conformance to 3.5.4.2, 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. This test may be performed in conjunction with 4.6.4.3.5 and 4.6.4.3.6.
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