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|  MIL-T-81404B(AS)
4.5.4.1 Special test schedule.
Selection of test sets for special tests
shall be amde as follows:
a.
On an early equipment after an engineering or material
change.
Whenever failure reports or other information indicate
b.
additional tests are required. (This will be determined by
the procuring activity.)
4.5.4.2 Scope of special tests. Special tests shall consist of such
tests as are acceptable to by 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 and make available for procuring activity acceptance prior to
conducting the tests (see 6.2.2).
4.5.5 Test Set. Should a failure occur during either the sampling,
reliability assurance or special tests, the following action shall be taken:
a. Determine the cause of failure.
Determine if the failure is an isolated case or a design
b.
defect.
c.
Have available for procuring activity authorization, proposed
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.
4.5.6 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
4.5.6.1. The life test sample will 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 VI receive at least 300 hours each of test time.
4.5.6.1 Test conditions. The life test shall be conducted under the
standard conditions specified in 3.3.3.
4.5.6.2 Test periods. The test may be run continuously or
intermittently.
Any period of operation shall be of sufficient duration to
permit the test set temperature to stabilize. Periodically, the test set
shall be turned on and off several times and put through its various phases of
operation.
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