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|  MIL-T-62531(AT)
3.7.2 Highway operation. The vehicle shall transport the rated payload and towed load over
prepared roads. Performance shall be demonstrated on smooth, dry, relatively level, concrete
roadway (see 4.7.2).
3.7.2.1 High speed. The vehicle transporting its rated payload and towed load, limited to a
maximum gross combination weight of ______ newtons (N), shall operate at a sustained high
speed of not less than ______ kilometers per hour (km/h) (see 4.7.2.1).
3.7.2.2 Low speed. With the engine operating in the speed range which delivers maximum
torque, the vehicle with its rated payload and towed load shall operate at a sustained low speed of
not more than ______ km/h without damage to the vehicle (see 4.7.2.2).
3.7.3 Fording operation. The vehicle shall transport the rated payload and towed load, when
fording hard bottomed crossings of fresh or salt water not less than ______ millimeters (mm) in
depth, for a 15 minute period without requiring addition of special equipment, or adjustments.
For air brake systems, the brake actuation and release times required by FMVSS 121 will not be
compromised (see 4.7.3).
3.7.3.1 Deep water fording. With the deep water fording kit installed, vehicles that require
deep water fording capability shall ford hard-bottomed, fresh or salt water crossings, remaining
immersed for a period of 30 minutes. While still submerged, the engine shall restart after being
stopped for 3 minutes and then operated for an additional 15 minutes, without damage to the
vehicle. Vehicles shall ford water up to a depth of ______ mm, including wave height. With the
fording kit installed, the vehicle shall operate continuously on land, before and after fording
operations, without damage to the vehicle. At the conclusion of such operation, a maximum of
one percent water contamination by volume in the lubricating oil is permissible (see 4.1.3.1).
3.7.4 Gradeability. The vehicle shall demonstrate gradeability operations on prepared
grades having the minimum percentage specified without stalling, slipping, overheating, or
upsetting (see 4.7.4).
3.7.4.1 Longitudinal grades operation. The vehicle transporting its rated payload and towed
load, limited to a maximum gross combination mass of ______ N shall ascend not less than a
2 percent grade at a speed of not less than ______ km/h. The vehicle transporting its rated
payload, without towed load shall negotiate a 60 percent grade at a minimum speed of
______ km/h. Grade surface shall be smooth, dry concrete (see 4.7.4).
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