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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 220F 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
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