MIL-DTL-62049G
4.5.10.3.1 Optional acceptance test. To determine conformance to 3.6.3.2, the
semitrailer without rated payload shall maintain application of the brakes and be held stationary
on a 10 to 20 percent grade for not less than 5 minutes.
4.5.10.3.2 Optional Government test. To determine conformance to 3.6.3.2, the
semitrailer with rated payload shall maintain application of the brakes and be held stationary on a
10 to 20 percent grade for not less than 5 minutes. Immediately thereafter, the semitrailer shall
be towed and all the semitrailer wheels shall skid after brakes have been burnished.
4.5.10.4 Fording test. To determine conformance to 3.6.4, the semitrailer shall be towed
through water crossings at the depth specified for 15 minutes without special preparation. The
wheel bearings shall be examined for water contamination and shall not be greater than specified
in 3.3.1.
4.5.10.5 Tracking ability. To determine conformance to 3.6.5, the semitrailer loaded
with payload and towed as specified, shall track the towing vehicle within 2 inches to each side
of the towing vehicle when the towing vehicle is moving in a straight line. Conduct this test on
hard surface, relatively level highway terrain at varying speeds from 30 to 55 miles per hour.
4.5.10.6 Turning ability. To determine conformance to 3.6.6, the semitrailer shall meet
the requirements specified, without cramping, side-slipping, or damage to either the towing
vehicle or the semitrailer.
4.5.10.7 Landing device. To determine conformance to 3.6.7, place the semitrailer on a
firm surface, and operate the landing device and leveling mechanism. Couple and uncouple the
towing vehicle, and raise and lower the leveling mechanism.
4.5.10.8 Watertightness/rain. To determine conformance to 3.6.8, after subjecting each
semitrailer to the applicable road test, subject each semitrailer to a rain/water spray test for not
less than 45 minutes in accordance with 4.5.10.8.1.1 or 4.5.10.8.1.2. Subject each semitrailer to
rain/water spray testing in its closed position and in its expanded position (with panels installed
and properly adjusted). Water leakage shall not be allowed.
4.5.10.8.1 Simulated rain testing. Line-water pressure within 3 feet from the nozzle
furthest away from the water source shall be not less than 55 psi. Completely spray the sides,
roof, front, and rear of the semitrailer body, with individual nozzle sprays impinging and
impacting all areas of the exterior of the semitrailer body (except the underside) at angles of
20 to 90 degrees to the sprayed surface. Nozzle spray shall be the full cone type. All visible
inboard and inside surfaces of the semitrailer outer shell and interior shall show no moisture
penetration or water leakage during the spray period. The inside surface of the clearance/marker/
taillights/blackout lights lens shall show no evidence of moisture penetration. During the spray
test, the semitrailer body door seals and door handles shall not require supplemental sealing
methods. If leakage occurs, the semitrailer body shall be rejected. Upon completion of repairs,
retest the entire body in accordance with the above.
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