MIL-DTL-62013E(AT)
prior to testing. A combat-loaded condition is not required. When specified (see 6.2), the
break-in run shall be simulated (see 4.5.3.3).
3.5 Performance. A complete vehicle, loaded with rated payload, serviced as specified in
4.3, and equipped for existing climatic conditions, shall operate as specified herein without special
equipment. Performance shall be demonstrated on smooth, level, hard-surfaced roads free of
loose material, except that a section of road shall be as shown in figure 1.
3.5.1 Reliability. Reliability shall be not less than 750 mean miles between failure
(MMFB) when subjected to a 5000 mile operational test (see 4.5.4).
3.5.2 Durability. The vehicle with rated payload shall have a 50% probability of
completing the 5000 test miles (see 4.5.4) without replacement, rebuild, or major overhaul of the
engine, transmission, transfer gear unit, differential steer unit, or final drives, and without repair or
rebuild of the hull.
3.5.3 Maintainability. Total maintenance, excluding driver/crew checks and services, shall
not exceed 175 manhours during the 5000 mile operational test (see 4.5.4).
3.5.4 Environmental conditions. The complete vehicle with rated payload shall operate in
ambient air temperature of +125°F to -25°F and, with special equipment installed, to -65°F. The
complete vehicle shall withstand storage at -80°F without deterioration that may cause failure of
any component part of the vehicle (see 4.5.19).
3.5.5 Cooling systems.
3.5.5.1 Engine cooling. With the vehicle operating in an ambient temperature of 125°F,
the engine cooling system shall maintain engine coolant at not more than 230°F measured at a
point in the engine outlet to radiator. The radiator pressure cap shall relieve between 13 and
18 pounds per square inch gage (psig). Air conditioning or microclimatic cooling should be used
to provide cooling for the operators of these vehicles to allow them to effectively operate the
vehicles at their mission parameters (see 4.5.2 and 4.5.20).
3.5.5.2 Transmission, lubricant cooling. With the vehicle operating in an ambient
temperature of 125°F, the transmission lubricant cooling system shall maintain lubricant
temperature at not more than 325°F, at the point where the coolant flows out of the radiator and
into the cooler except at torque converter speed ratios less than four to ten (see 4.5.2 and 4.5.20).
3.5.5.3 Differential oil cooler. With the vehicle operating in an ambient temperature of
125°F, the differential lubricant cooler shall maintain lubricant temperature below 300°F,
measured out of differential into cooler (see 4.5.2 and 4.5.20).
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