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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