2 ton, multi-fuel engine driven, six-wheel six-wheel drive, military design truck chassis, trucks, and truck tractors.

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MIL-T-46780D(AT)

climatic extremes as specified in standard MIL-STD-210, without deterioration that may cause failure of any component part of the vehicle.

3.4.2 Vehicle loading. Vehicle performance characteristics shall be demonstrated with the specific vehicle loaded as specified ( see Table XIV) with full complement of fuel, lubricant, and coolant, with driver and assistant driver or equivalent weight of 200 pounds each, with

winch assembly or 500 pound equivalent weight, mounted at the front of the vehicle to simulate mounting of winch, with soft-top cab, and with full vehicular equipment. Gross weight shall not include tire chains, metal cab enclosures, or special equipment kits.

3.4.3 Engine. Vehicle shall meet all performance requirements specified herein, when engine conforming to MIL-E-62106 is installed.

3.4.3.1 Cooling system. Cooling system shall maintain a coolant temperature out of the engine of not greater than 220°F with no evidence of aeration from the radiator under all environmental and performance conditions specified herein and in the engine specification.

3.4.3.2 Exhaust system. The exhaust system as installed shall be gastight and leakproof to prevent the concentration of exhaust gas in the occupied areas and shall be in accordance with HEL-STD S-6-66.

3.4.4 Cross-country operation. The vehicle except truck tractor in combination with semitrailer shall transport the rated cross-country (CC) payload and towed-load over unimproved roads trails, open fields, hills and rough cross-country terrain.

3.4.4.1. Limited cross-country operation. The vehicle shall transport the rated limited cross-country (CC) payload and towed load over reasonably firm terrain other than highways or roads.

3.4.4.2 Transfer case. The air operated transfer case for front axle drive, shall operate between air pressure of 50 psi to vehicle maximum air pressure.

3.4.5 Highway operation. The vehicle shall transport the rated highway (HY) payload over prepared roads. Performance shall be demonstrated on smooth, dry, relatively level, concrete roadway.

3.4.5.1 High speed. The vehicle shall operate at a sustained high speed of not less than

50 miles per hour (mph).

3.4.5.2 Low speed. The vehicle with towed load shall operate at a low speed of not more than 2 1/2 mph with the engine operating in the speed range which delivers a maximum torque.

3.4.6 Water fording operation. The vehicle shall transport the rated cross-country payload and towed load when fording hardbottom crossings of fresh or salt water, at least