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|  MIL-T-85378(AS)
4.5.4 Special tests. Special tests shall be conducted on a quantity of
test sets for the purpose of checking the effect of any design or material
change on the performance of the test set and to assure quality control. The
test set selected for special tests may be selected from test sets previously
subjected to the sampling or reliability assurance tests.
Selection of test sets for special tests
4.5.4.1 Special tests schedule.
shall be made as follows:
On an early test sets, after an engineering or material
a.
change.
b.
Whenever failure reports or other information indicate
(This will be determined by
additional tests are required.
the procuring activity. )
4.5.4.2 Scope of special tests. Special tests shall consist of such
tests as are acceptab le to the procuring activity. Test procedures previously
approved for the first article tests shall be used where applicable. When not
applicable, the contractor shall prepare a test procedure for procuring
activity acceptance prior to conducting the tests (see 6.2.2).
4.5.5 Equipment failure. Should a failure occur during either the
sampling 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.
Have available, for procuring activity acceptance, proposed
c.
corrective action intended to reduce the possibility of the
same failure(s) occurring in future tests (see 6.2.2).
Where practical, include a test in the individual test to check
d.
all test sets 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 test sets that have passed the individual
tests. The life test shall be performed under the conditions specified in
4.6.1. The life test sample shall be selected by the government inspector in
accordance with the following.
(Test sets which have successfully passed the
Sampling Tests, Reliability Tests, or Special Tests may be selected for life
tests.) When reliability tests are conducted, the life test may be omitted
if, during the reliability tests, a quantity of test sets equal to, or more
than, that listed in table IX receive at least 300 hours each of test time.
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