MIL-S-45152 Semitrailers, Lowbed: CommercialThis specification covers commercial lowbed semitrailers. Each vehicle procured under this specification is a commercial item which shall be warranted by the manufacturer as specified in acquisition documents.

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MIL-S-45152H

without excessive brake capacity. GVWR and GCWR shall be the maximum ratings on the tractor only and not necessarily the actual maximum GVW and GCW of the combination of test vehicles. Failure of the vehicle combination to stop within the required 40 feet from a speed of

20 mph shall be cause for rejection.

TABLE VIII. Maximum tractor characteristics.

Size of semitrailer

Max. tractor GVWR, pounds

Max. tractor GCWR, pounds

26,000

28,000

35,000

50,000

70,000

77,000

100,000

50,000

60,000

75,000

100,000

137,000

170,000

200,000

* 4.3.7 Suspension system articulation test. The fully loaded semitrailer shall be driven onto

6 inch blocks to simulate each of the conditions in 3.9.1, 3.9.2 or 3.9.3, as applicable. Failure of any wheel to maintain contact with the ground or the blocks shall be cause for rejection.

4.3.8 Electrical test. An electrical test shall be conducted to determine that all vehicle lights are functioning. In addition, when an interconnected 24-volt system is furnished, the circuits of the 12-contact receptacle shall be energized with not less than 28 volts dc regulated voltage for a time sufficient to stabilize the temperature of the resistor assembly for not less than 30 minutes in an ambient temperature of not less than 77°F. After the test, the resistor assembly, including resistors, wiring and adjacent components shall be examined for evidence of overheating, deterioration or damage.

4.3.9 Folding and detachable gooseneck test. The gooseneck on class B, C, D and E semitrailers shall be tested to determine conformance to the requirements specified herein (see 3.3.4, 3.8.2, 3.8.3, 3.8.4 and 3.8.5).

4.3.10 Load test for sizes 50, 60 and 75. Unless an extended road test is specified

(see 4.3.3), sizes 50, 60 and 75 first vehicle shall be loaded with one and one-half times the rated payload and shall be examined to determine conformance to the static requirements of this specification. After completion of static examination, sizes 50, 60 and 75 first vehicle shall be road tested on public roads or may be road tested at the contractor's facility for a distance of not less than 5 miles, without payload, to determine conformance to the functional requirements of this specification.