MIL-DTL-62270B(AT)
3.4.1.5 Level road drift. The chassis drift shall not exceed 3 ft in 100 ft without manual
steer correction (see 4.7.1.5).
3.4.1.6 Level road stopping. The chassis shall stop within 60 ft from the point of brake
application. Drift shall not exceed 4 ft. Steering correction is allowed (see 4.7.1.6).
3.4.1.7 Grades and slopes. The chassis shall ascend longitudinal grades of 60% in
forward and reverse gear without stalling or damage to the power plant and powertrain. The
chassis shall operate on right and left side slopes of 30%. During grade and slope operations,
normal engine lubricating oil pressures shall be maintained (see 4.7.1.7).
3.4.1.7.1 Engine starting (grades and slopes). The engine shall restart in not more than
1 minute, after being stopped for 2 minutes, with the chassis parked on a 60% grade facing up or
down grade. The engine shall restart in not more than 1 minute, after being stopped for
2 minutes, with the chassis parked on 30% side slopes with left or right side up-slope
(see 4.7.1.7).
3.4.1.7.2 Fuel supply (grades and slopes). During engine operation, the fuel system shall
maintain fuel supply to the engine when ascending and descending 60% grades in forward and
reverse gear and when the chassis is being operated on 30% side slopes with either side of chassis
up slope (see 4.7.1.7).
3.4.1.7.3 Holding. With the chassis standing on a 60% grade, with service brakes
applied, the chassis shall be held stationary when headed either up or down grade. With parking
brake engaged and all other holding devices inoperative, the chassis shall be held stationary when
headed either up or down grade (see 4.7.1.7).
3.4.1.7.4 Grade speeds. The chassis shall operate at a sustained speed of 10 mph while
ascending a 10% grade and at 20 mph while ascending a 3% grade (see 4.7.1.7).
3.4.1.8 Shallow water fording. The chassis shall ford a level, hard-bottom body of water
48 in. in depth, including wave, without special equipment. The accumulation of water shall be
not more than 2 in. on the crew compartment hull floor measured in the center of the "V" when
tested in accordance with 4.7.1.8. All accessories shall operate satisfactorily during and after
fording operations.
3.4.1.8.1 Engine starting (shallow water). The engine shall restart in not more than
3 minutes when tested in accordance with 4.7.1.8.1.
3.4.1.8.2 Lubricant contaminations. After fording operations, the water content of the
transmission, engine, final drives, and suspension system lubricants shall be not more than 2% by
volume (see 4.7.1.8.2).
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