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|  MIL-T-83808
(84)
scribed in 4.6.9.1 with the contractor's option of using the tests described in paragraphs 4.6.6, 4.6.7.3,
4.6.7.4, 4.6.7.5, 4.6.7.5.1, and 4.6.7.8 towards the total hours required to meet the reliability demonstra-
tion. The required 250 hours MTBF at a 0.80 confidence level equates with 400 hours of testing without a
failure. The test in 4.6.9.1 shall be continued if necessary to accumulate the required hours Scheduled
maintenance or adjustments authorized by this specification or the procuring activity shall be not be
counted as failures.
Vehicle durab ility test. The vehicle, at its GVW, shall be driven 2,000 miles under loads as
4.6.9.1
follows :
a. One hundred miles at 4,500 pounds DBP
b. Two hundred miles at 3,500 pounds DBP
c. Four hundred miles at 3,000 pounds DBP
d. Five hundred miles at 2,000 pounds DBP
e. Eight hundred miles at 1,000 pounds DBP
During the tests, the vehicle shall be stopped by the service brakes at least once in each five
miles.
nstration. . Compliance with the repair time requirements shall be demon-
4.6.10
strated by task performance. All scheduled maintenance tasks and all tasks listed in 3.1.3.2.1 shall be
performed In addition, corrective maintenance tasks shall be selected by the procuring activity from an
approved list of tasks provided by the contractor in the first article test procedure. This list shall represent
all expected failures over the life of the vehicle. Not less than 25 or more than 50 of the tasks shall be
demonstrated to verify a maximum repair time within the required limit. As part of this demonstration, the
recommended frequencies of the scheduled maintenance tasks and the times recorded to accomplish the
tasks shall be used to develop an expected value of scheduled maintenance time per measure of use,
such as calendar time, hours of operation, or miles traveled. The capability of performing maintenance
tasks by personnel wearing arctic mittens shall be demonstrated.
Air transportability analysis. A detailed engineering analysis shall be
conducted to demon-
4.6.11
strate compliance with 3.1.9. The analysis shall include the tiedowns and all major
components and their
ability to withstand the accelerations specified in MlL-STD-1791. The evaluation
shall also include a
dimensional analysis for the vehicle while loaded aboard Types C-130, C-141, C-17,
and C-5 Aircraft.
4.6.12
User test. The vehicle shall be delivered to the location specified (see 6.2) for 60 days of op-
erational use. The 60 available days shall be consecutive, except when interrupted for maintenance/
repair downtime, as defined herein. The user test will not begin until after completion of the first article
tests as defined by 4.4 and air transportability certification. Acceptance test (see 4.5) and the examination
of the product (see 4.6.1) shall be performed on the user test sample prior to shipment of the user test
sample. The user test sample shall not be shipped without prior 15 day notification to the PCO. The test
period shall begin after the vehicle has been inspected and prepared for towing and shall end when 60
days of availability are complete or 75 calendar days have elapsed, whichever occurs first. If the user test
sample has not been available for 60 test days after 75 calendar days have elapsed, the user test sample
shall be considered a failure. The vehicle shall be available for any one period of eight consecutive hours
during each day of the 60 day test. The periods shall be scheduled by the sites representative, and the
schedules shall be provided to the contractor at least 12 hours in advance. Any period of more than four
hours of the same day that the vehicle is out of service for maintenance or repair shall not be considered
an available day for the test period. The vehicle shall be operated, and scheduled maintenance shall be
performed by Air Force personnel using the operation and maintenance procedures contained in the
preliminary technical data to be supplied with the test sample. The preliminary technical data shall contain
procedures for preparation/tiedown of the tractor for air shipment. The contractor shall provide any spe-
cial tools/equipment required to perform operators maintenance/scheduled maintenance. Any parts or
corrective actions required shall be provided by the contractor. Any corrective actions performed by the
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