MIL-S-62549(AT)
TABLE I. Road test profile, 6,000 mi.
Course |
Mileage (mi) |
Loading condition |
Primary road Improved secondary road Off-road 1/ |
2700 300 2420 280 300 |
rated payload empty rated payload empty rated payload |
1/ Level to slightly hilly.
3.2.1 Payload and distribution. The semitrailer shall be capable of transporting the rated payload without permanent deformation to the frame or gooseneck, while operating at the terrain profile specified in table I, with the load distribution specified in table II. The semitrailer shall be suitable for the concentrated, pin point and localized stresses caused by trucks, track pads and wheels, and any other normally distributed loads on the platform caused by the full range of intended use specified in Appendix A. Maximum allowable kingpin load shall not exceed
44,730 pounds (lb) with the semitrailer fully loaded.
TABLE II. Payload distribution.
Rated payload (lb) |
Distribution |
|
Length, feet (ft) 1/ |
Width, inches (in) 2/ |
|
56,000 80,000 |
18 18 |
30 30 |
1/ Length of evenly distributed payload in center of load space
2/ Width of each crawler track, centered on load space.
3.2.2 Environmental conditions. The semitrailer shall be operational after a 24 hour (hr) cold soak in ambient temperature ranging from minus (-) 25 degrees Fahrenheit (°F) to plus
(+) 120°F, capable of operating in hot, humid tropical environments and dry, dusty conditions, and capable of being stored for extended periods in temperatures ranging from -28 to +160°F without damage.
3.2.3 Reliability. The reliability of the semitrailer shall have a design goal requirement of
6,000 mean miles between failure (MMBF) as specified in 3.2. For calculation of MMBF, a failure shall exist when the semitrailer prevents operations, reduces performance below essential levels, indicates that further operation would be unsafe, or indicates that further operations might result in extensive damage to the equipment. Any of these conditions that cannot be corrected by the crew in 1 hr using basic issue items (BII) that are carried on the truck-tractor or the
semitrailer is considered to be a failure. Maintenance and human induced failures are excluded.
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