MIL-S-45152H
3.3.1 Turning ability. The semitrailer shall be capable of assuming a 90 degree angle to a coupled truck tractor without cramping and without damaging the semitrailer or the truck tractor.
* 3.3.2 Brake performance. The service brakes shall stop the truck tractor-semitrailer combination, with the semitrailer loaded with specified payload, within the stopping distance requirements of Federal Motor Carrier Safety Regulation 393.52. Requirements shall be met with a truck tractor loaded to its full rated gross vehicle weight (GVW) and gross combination weight (GCW).
3.3.3 Tracking ability. The semitrailer shall conform to the tracking requirements of Federal
Motor Carrier Safety Regulation 393.70(a).
3.3.4 Folding gooseneck performance. The gooseneck on class B and class D folding gooseneck semitrailers shall be capable of folding to the ground and of being raised and locked as specified herein, with the rated payload positioned as specified herein (see 3.4) without evidence of any type of component failure, deformation, permanent set, misalinement or interference between parts.
* 3.4 Payload and distribution. The semitrailer shall be capable of transporting the rated payload (shown in table III for the applicable size) without permanent deformation in the frame or gooseneck or any other part, under the operating conditions specified in 3.3, with the load:
(a) distributed as specified in table III for types I and II or
(b) evenly distributed in the loadspace for type V. In addition, type V semitrailer shall be capable of transporting 65 percent of rated payload concentrated (distributed) as specified in table II for the applicable size of semitrailer.
(c) Further, all types of semitrailers shall be suitable for the concentrated, pin point,
and localized stresses caused by mobile loads being driven onto the vehicle, by tracks, track pads and wheels, and any other non-evenly distributed loads indicated by the full range of intended uses specified in 6.1.
TABLE III. Payload distribution.
Rated Size payload, pounds |
Distribution |
|
Length of evenly distri- buted payload in center of load space, feet |
Width of each crawler track, centered on load space, inches |
|
15 30,000 20 40,000 25 50,000 35 70,000 50 100,000 60 120,000 75 150,000 |
8 10 10 11 11 1/2 12 1/2 14 |
16 22 22 24 30 32 34 |
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