MIL-DTL-13714F
4.4.7 Grade and slope operation. To determine conformance to 3.4.3, the vehicle shall be
operated on 30 percent grades headed up and down grade, and on 20 percent side slopes with
each side of vehicle up slope.
4.4.8 Service brakes test. To determine conformance to 3.4.4.1, the vehicle combination
shall be operated as specified and evaluated for conformance to requirements.
4.4.9 Parking brake test. To determine conformance to 3.4.4.2, the parking brake (hand)
shall be operated as specified.
4.4.9.1 Automatic brake actuation test. To determine conformance to 3.4.4.3, the chassis
shall be placed on a 15 percent grade and the automatic breakaway device actuated. The brakes
shall hold the chassis stationary for time specified.
4.4.10 Turning and tracking ability test. To determine conformance to 3.4.5, the prime
mover shall be coupled to the trailer and driven to the prime mover's minimum turning circle to
the right and to the left, without interference between the prime mover and the towed trailer.
During road test, trailer tracking ability shall be observed.
4.4.11 Landing device. To determine conformance to 3.4.6, the trailer shall be placed on
firm surface and the landing device and leveling mechanisms operated. The towing vehicle shall
be coupled and uncoupled and the leveling mechanism raised and lowered.
4.4.12 Fording test. To determine conformance to 3.4.7, the trailer shall be towed
through water crossings at depth specified, and shall be immersed for the specified time.
4.4.13 Trailer lifting test. To determine conformance to 3.4.8, the trailer shall be lifted to
a height at which the wheels are 12 inches off the ground and held for 15 min. Upon completion
of the lift test, the trailer shall be examined for permanent deformation and failed welds.
4.4.14 Body waterproofness test. To determine conformance to 3.4.9, all openings shall
be closed and secured as in normal trailer operation. Body shall be subjected to a 15 min spray
test. The spray shall be delivered by nozzles supplied by a water system operating at a line
pressure of not less than 25 pounds per square inch (psi) (172.37 kilopascals (kPa)), sufficient in
number and so placed (approximately two feet from body) that the spray shall afford full coverage
of the sides, front and rear to the body. Subsequent to test, all door openings and closures shall
operate without binding and interference. Body interior shall be examined for any indication of
water accumulation.
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