MIL-S-62359(AT)
3.3 Performance requirements.
3.3.1 Functional requirements. The semitrailer(s) shall be capable of transporting, dumping, spreading (types I and III) and windrowing (types II and IV) material, as specified in
3.5.1 through 3.5.2.
3.3.2 Mobility performance. The semitrailer, fully equipped and loaded with the specified payload (see 3.2.2), shall be capable of being towed at speeds as great as 10 miles per hour (mph) over unimproved roads and over reasonably hard uneven terrain; and being towed at speeds as great as 55 mph over improved roads.
3.3.2.1 Turning ability. The semitrailer shall be capable of assuming a 90 degree angle to the coupled towing vehicle without cramping or damaging the semitrailer or the towing vehicle.
3.3.2.2 Tracking ability. The semitrailer shall conform to the tracking requirements of
Federal Motor Carrier Safety Regulation 393.70(a).
3.3.2.3 Brake performance. The service brakes shall stop the semitrailer-tractor combination, with the semitrailer loaded with specified payload, within the stopping distance requirements of Federal Motor Carrier Safety Regulation 393.52.
3.4 Chassis components.
3.4.1 Chassis frame and body structure. The semitrailer chassis frame and body structure shall be an electrically welded, all-steel integral unit. The rated payload and the sprung weight of the semitrailer shall not impose a fiber stress greater than 50 percent of the yield strength of the materials used when the semitrailer is operating under mobile operating conditions specified
in 3.3. The chassis main frame members shall extend the full length of the body and shall be combined with sufficient number of crossmembers to insure stability.
3.4.2 Suspension system. The semitrailer shall be furnished with the manufacturer's standard suspension system. Each component of the suspension system shall have a rated
capacity at least equal to the load imposed, measured at the ground, when the semitrailer is loaded with its rated payload. Clearances shall preclude interference between tires and any other part of the semitrailer under the operating conditions specified herein.
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