MIL-V-62347(AT)
TABLE III. 750 Mile test cycle.
Course Mileage
Number of
and speed 1/ ITV missions
Hard-surfaced roads |
150 |
6 |
Gravel and dirt roads |
300 |
12 |
Level cross-country 2/ |
150 |
6 |
Hilly cross-country 2/ 150 6
1/ Speeds shall be varying up to the maximum safe speed in all applicable gear ranges depending on course and conditions.
2/ Ten percent (10%) of all operation on cross-country courses shall be conducted with the launcher erected and a vehicle speed not to exceed 5 mph.
4.4.2.3 Reliability verification. To determine conformance to 3.2.1, a point estimate of the MTBF equal to greater than 180 hours must be demonstrated during the test. The point estimate will be computed by dividing the total weapon station hours (adjusted to 11.5 hours per mission), of the ITV undergoing durability testing, by the total cumulative chargeable combat mission failures.
4.4.2.4 Maintainability verification. To determine conformance to 3.2.2, the point estimate of the maintenance ratios for the ITV installed on the IPT durability vehicles shall not be greater than 0.05 for Organizational Maintenance, 0.04 for Direct Support Maintenance, and 0.09 for Combined Organizational and Direct Support. The maintenance ratio shall be calculated by dividing the active maintenance man hours (scheduled and unscheduled scored in accordance
with the Improved TOW Vehicle RAM-D Failure Definition and Scoring Criteria experienced on
the kits of these ITV's) for each level of maintenance by the total ITV kit hours, adjusted to
11.5 hours per mission.
4.4.2.5 Failure. Failure of the vehicle attributable to a deficiency in workmanship or materials during, or as a result of, the test shall be cause for rejection of the vehicle. Further, the Government may refuse to continue acceptance of production vehicles until evidence has been provided by the manufacturer that corrective action has been taken to eliminate the cause of the deficiency. Any deficiency found during or as a result of the test shall be prima facie evidence that all vehicles already accepted prior to completion of the IPT are similarly deficient unless evidence satisfactory to the contracting officer is furnished by the contractor that they are not similarly deficient. Such deficiencies on all vehicles shall be corrected by the contractor at no cost to the Government.
4.5 M901 System integration break-in. To determine conformance to 3.5, each vehicle shall be operated for a distance of fifty miles or more on smooth, hard-surfaced roads. A section of road shall be as shown in figure 1 and shall be traveled at least once every 5 miles. Except for equipment and component installation, and servicing performed by the contractor as a final processing of vehicles for acceptance, the vehicles shall be completely assembled. Vehicles
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