MIL-DTL-85405A(AS)
4.5.5.2 4,000 pound test load. The 4,000 (+100, -0) pound test load shall consist of bulk
material, such as steel or concrete evenly distributed over the entire trailer deck, and shall not
restrict the trailer cramping angle or drawbar movement.
4.5.6 Mobility tests. During the following tests, the trailer shall be closely observed for its
ease of handling. Any tendency to yaw, sway, dog walk, or jackknife shall be cause for rejection.
4.5.6.1 Road tests. The trailer loaded with a 4,000 (+100, -0) pound test load, shall be
subjected to the following road tests:
SURFACE
SPEED
DISTANCE
Level Paved Highway
15-20 mph
100 miles
Graded Gravel Road
5-10 mph
50 miles
Level Course 1/
5-10 mph
5 miles
1/ On a level course with a length of 0.625 inch chain temporarily welded to the outside of the
wheel rim running over the tire to the inside of the wheel rim. This length of chain will be welded
in the same manner on all four tires.
4.5.6.2 Maneuverability. Upon completion of road testing (see 4.5.6.1), the loaded trailer
shall be towed over level paved highway, at speeds of 8 mph through 25 right circle turns and 25
left circle turns, both at maximum cramping angle. It shall then perform 25 sudden stops at
speeds of 20 mph. At the conclusion of these tests and those described in 4.5.6.1, the vehicle
shall be closely examined. Any evidence of excessive wear or damage shall be cause for rejection.
4.5.6.3 Side slope test. At a speed of 5 to 10 mph for a distance of 20 feet, the trailer,
loaded with a 4,000 (+100, -0) pound test load (see 4.5.5.2), evenly distributed over the entire
deck and to a maximum height of 18 inches above the deck, shall be made to traverse a minimum
8 degree (1.750 inch rise/foot) side slope without overturning.
4.6 Magnetic particle inspection test. Stressed weldments and castings, when required by
the detail drawing, shall be subjected to magnetic particle inspection described in ASTM-E1444.
Cracks are a cause for rejection.
4.7 Penetrant inspection. All aluminum welded joints shall be inspected in accordance with
ASTM-E1417. Cracks are a cause for rejection.
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