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|  MIL-T-62531(AT)
4.5 RAM-D. To determine conformance to 3.5, the RAM-D requirements shall be verified
by reviewing the test data developed during the testing of ______ vehicles at a Government
Proving Ground. The vehicles shall be operated for a distance of ______ kilometers each, for a
total of ______ kilometers. The data collected shall be reviewed, analyzed and computed as
specified in 3.5.1, through 3.5.4 and appendix B, system failure definition/scoring criteria
(FD/SC scoring criteria).
4.5.1 Reliability (mission). To determine conformance to 3.5.1, the vehicles shall
demonstrate the ability to meet the reliability and confidence levels specified based on the
duration of the mission, the number of missions, and the number of mission failures as scored by
the FD/SC scoring criteria.
4.5.2 Availability (inherent). To determine conformance to 3.5.2, vehicle availability shall
be calculated using the results of reliability testing and maintainability testing. The minimum
availability acceptance shall be ______ percent.
4.5.3 Maintenance ratio. To determine conformance to 3.5.3, the vehicles shall not exceed
the maintenance ratio specified.
4.5.4 Durability. To determine conformance to 3.5.4, the number of failures occuring during
testing shall not exceed those specified.
4.6 Payload. To verify conformance to 3.6, vehicles shall be tested with their rated payloads
as specified in table I, except that the truck tractor will include the towed payload with applicable
semitrailer and all other trucks will tow their rated towed load whenever possible throughout the
test.
4.6.1 Terrain mobility percentage. Vehicles shall be tested with rated payload and towed
load as specified in 3.6.1, and shall be operated to the percentages specified.
4.7 Performance. The vehicle shall be verified as suitable for the intended use by
satisfactorily completing the specified performance requirements. Vehicles submitted for
acceptance shall pass the specified inspections and tests. The vehicles shall be completely
assembled, including required kits, as applicable, and shall be properly adjusted and serviced for
operation (see 3.7).
4.7.1 Vehicle loading. Vehicle performance shall be demonstrated with the vehicle loaded
as specified in 3.7.1 and table I, over cross country operation (see 3.6.1.1,3.6.1.2 and 3.6.1.3).
4.7.2 Highway operation. To determine conformance to 3.7.2, the vehicle shall transport the
rated payload and towed load over prepared roads. Performance shall be demonstrated on
smooth, dry, relatively level, concrete roadway (see 3.7.2).
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