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|  MIL-C-52437C
d. Negotiate hard bottom creek water crossings.
e. Negotiate highway V-ditches without damage (standard FHWA Bureau of Public
Roads type, 36-inches wide by 18-inches deep).
f. Withstand immobilization and tow-out operations.
g. Provide the specified minimum of suspension articulation, as cited in each
specification sheet, between all combinations of wheels, front-to-rear as well as
diagonal.
h. Negotiate a chatter course to produce at least 2 600 either upward or downward
accelerations having a magnitude ranging between 3 to 6 g's to the center of the road
wheel on the trailer chassis.
i. Trail the prime mover without bottoming, weaving, or side sway.
j. Permit turns up to a minimum angle of 60 degrees from straight ahead to the right and
to the left without interference or damage of truck or trailer.
k. Withstand tractor maneuvering resulting in pivot turning of the running gear in place,
both clockwise and counter-clockwise.
l. Comply with DOT FMCSR off-tracking tolerance.
m. Provide minimum braking performance in compliance with DOT FMVSS,
DOT FMCSR, and the California Vehicle Code.
n. Provide braking system in accordance with TTMA RP No. 12 and RP No. 44.
o. Provide parking brakes capable of holding the applied wheels locked on longitudinal
grades up to 30 percent.
3.7.3 Fording. The trailer chassis, without prior preparation shall ford hard-bottom water
crossings to a depth of the loaded rolling radius of the CCE trailer's tires and 30 inches for size
9 MD trailer chassis for not less than 5 minutes duration without damage. After fording, the
trailer chassis shall show no evidence of water leakage into waterproof brake components or
waterproof electrical lights, and water contaimination of the wheel bearing lubricant in the hub
shall not exceed a 5-percent increase.
3.7.4 Coupling and jacking. The support leg shall withstand, without damage or permanent
deformation, the forces encountered in coupling and uncoupling the trailers from prime movers,
and a free-fall drop of not less than 4 inches onto a concrete surface. In addition, the size 9 MD
trailer chassis shall withstand manual maneuvering of the loaded trailer chassis on a hard surface
by personnel. From its fully retracted position, the support leg shall raise and lower the trailer
chassis with payloads throughout their full range of travel, both with and without the rear
stabilizing stands, or a substitute support, in place under the rear of the trailer frame rails,
without evidence of malfunctions, binding, or interference.
3.8 Human factors. The human factors characteristics of the trailer chassis shall be in
accordance with following minimum requirements:
a. Comply with SAE J185 and OSHA Standards for all handholds, walkways, and
stepping sufaces and include ladders per TTMA RP No. 59.
b. Provide operating and maintenance features for operation by personnel ranging from
the small person, clothed, through the large person, arctic clothed, in accordance with
SAE J833 and SAE J925.
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