MIL-DTL-62270B(AT)
governed speed and transmission in low gear. If any damage occurred to the power plant or
powertrain shall constitute a failure.
4.7.1.5 Level road drift test. The chassis shall be operated on a smooth, paved surface
between 25 and 30 mph on a level road in a straight line. The test shall be run twice in each
direction and the average drift at end of four runs shall not exceed 3 ft. in 100 ft. without manual
steer correction.
4.7.1.6 Level road stopping test. The chassis shall be operated on a smooth, paved
surface at 20 mph on a level road. Stopping distance over 60 ft. from the point of brake
application, or a drift over 4 ft. shall constitute failure.
4.7.1.7 Grade and slope tests. The chassis shall be operated on the grades and slopes
indicated and performance observed. The chassis shall meet all grade and slope requirements
specified in 3.4.1.7 through 3.4.1.7.4.
4.7.1.8 Shallow water fording test. The chassis shall be operated in 48 in. of water.
After standing in 48 in. of water for not less than 30 minutes the water depth in the hull shall be
measured no more than 2 in.. Accessories and instruments shall be observed for proper operation.
4.7.1.8.1 Engine starting (shallow water) test. The chassis and engine shall be operated in
water 48 in. in depth for 30 minutes, the engine operating at 1000 revolutions per minute (rpm)
for 15 times and stopped for 15 minutes. The engine shall be observed for proper restart within
3 minutes. Accessories and instruments shall be observed for proper operation.
4.7.1.8.2 Lubricant contamination test. After completion of fording test, lubricant
samples shall be tested for water content using one or more methods specified in 4.4. No more
than 2% by volume of water is allowed.
4.7.1.9 Trench crossing test. One or more methods specified in 4.4 shall be used to verify
that the chassis shall be operated over trenches of 36 in. in depth by 102 in. in width. Should the
vehicle stall or the suspension or other vehicle equipment get damaged, this shall constitute for
rejection.
4.7.1.10 Vertical obstacles test. One or more methods specified in 4.4 shall be used to
verify that the chassis shall be operated when crossed over obstacles of 36 in. in height. Speed
shall not exceed 5 mph.
4.7.1.11 Turning test. The chassis shall be operated as specified. When measured, the
pivot-circle shall not exceed 35 ft.
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