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|  MIL-T-62531(AT)
4.7.2.1 High speed verification. To determine conformance to 3.7.2.1, the vehicle shall
transport the rated payload and/or towed load, limited to a maximum gross combination mass of
______ kg and at a sustained speed of not less than ______ km/h, on a smooth, dry, relatively
level, concrete roadway (see 3.7.2.1).
4.7.2.2 Low speed verification. To determine conformance to 3.7.2.2, with the engine
operating in the speed range which delivers the maximum torque, the vehicle shall be capable of
operating at ______ km/h for sustained periods without damage to the vehicle. Payload and
towed load shall be as specified in 3.7.2.2.
4.7.3 Fording test. To determine conformance to 3.7.3 the vehicle shall operate in a
minimum of _____ mm of water for at least 15 minutes. Immediately following the fording test,
the wheel hubs shall be removed and examined for water contamination. Oil samples shall be
taken from the engine, transmission, transfer transmission and front, intermediate and rear
differentials where applicable. Water contamination in excess of one percent by volume shall be
cause for rejection. For air brake systems, the brake actuation and release times required by
FMVSS 121 will not be compromised (see 3.7.3).
4.7.3.1 Deep water fording test. With deep water fording kit installed vehicle shall operate
normally on land or in water to a depth of mm for a minimum of 30 minutes. Vehicle shall meet
all performance requirements of 3.7.3.1. At the conclusion of test, examination for
contamination shall be conducted as in 3.7.3.1.
4.7.4 Grade and slope operation. To determine conformance to grade and slope operation as
specified in 3.7.4, 3.7.4.1, 3.7.4.2, and 3.7.4.3, vehicles shall be loaded and operated as specified.
During operation on slopes and grades, any evidence of stalling, slipping, overheating or
upsetting will be cause for rejection. During specified test, the engine shall be shut-off and
restarted a minimum of two times in each direction, with a minimum of two minutes during
shutdown, except that no shutdown will be performed on the two percent ascent grade. Oil
pressure shall be carefully observed during test. If pressure falls below the minimum pressure
indicated for safe operation, test shall be aborted. Any evidence of faulty lubrication, cooling,
fuel supply, leakage, or other malfunction during or following tests, shall be cause for rejection.
4.7.5 Braking ability. To determine conformance to 3.7.5, the vehicle, fully equipped and
with payload and towed load, and operated on smooth dry concrete shall stop and hold the
vehicle under the conditions specified for each braking system. The vehicle braking system will
be designed to meet all the performance and configuration requirements of FMVSS 105 or 121,
whichever is appropriate for the type of brake system installed in addition to the requirements
stated herein. Insure that vehicles equipped with full-air brakes include an alcohol aspirator with
an unbreakable transparent container and an automatic moisture ejector.
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