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|  MIL-D-85859(AS)
"Sampling Phase of Production Reliability Tests."
For the sampling phase,
Test Level E shall be used, except that the distribution box shall operate
continuously. The accept-reject criteria for Test Plan V shall be used to
determine the length of the tests (until an accept or reject decision is
reached).
4.5.3.2.1 Lot size for sampling phase. The distribution boxes constructed
during a 2-month period shall be one lot, The accept-reject criteria for
Test Plan IV shall be used to determine the length of the tests in each lot.
Unless otherwise specified in the contract or purchase order, no
distribution boxes shall be shipped until an accept decision is reached
under each lot (see 6.2.1).
4.5.3.3 Test details. The test details shall be part of the test
procedures prepared prior to the beginning of the qualification test phase
of the reliability assurance test.
4.5.4 Maintainability test. The Mean-Corrective-Maintenance-Time and
Maximum-Corrective-Maintenance-Time as specified in 3.4.2 shall be
demonstrated as specified in MIL-STD-471. Test Method 9.
4.5.5 Special tests. Special tests shall be conducted on a quantity of
distribution boxes for the purpose of checking the effect of any design or
material change on the performance of the distribution box and to assure
adequate quality control. The distribution box selected for special tests
may be selected from distribution boxes previously subjected to the sampling
or reliability assurance tests.
a.
On an early distribution box, after an engineering or material
change.
b.
Whenever failure reports or other evidences indicate additional
tests are required.
(This will be determined by the procuring
activity.)
4.5.5.2 Scope of special tests. Special tests shall consist of such tests
acceptable to the procuring activity. Test procedures previously approved
for the first article tests shall be used where applicable.
4.5.6 Distribution box failure. Should a failure occur during either the
sample or special tests, the following action shall be taken:
a.
Determine the cause of failure.
b.
Determine if the failure is an isolated case or design defect.
Where practical, include a test (in the individual test) to check all
c.
distribution boxes for this requirement until assurance is
obtained that the defect has been corrected.
4.6 Life test. The contractor shall furnish all samples and shall be
responsible for accomplishing the life test. The test shall be of 300-hours
duration and shall be conducted on distribution boxes that have passed the
individual tests. The life test shall be performed under the conditions
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