220.127.116.11.2 Voltage cycling.
Voltage cycling in accordance with MIL-STD-781 is
4.8 Special tests. Special tests shall be conducted on a quantity of test
sets as specified by the Government inspector 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 sets selected for special tests may be
from test sets previously subjected to the sampling or reliability assurance
4.8.1 Special test schedule.
Selection of test sets for special tests shall
be made as follow:
On early test sets after an engineering or material change.
Whenever failure reports or other evidences indicate that additional
tests are required. (This will be determined by the procuring activity. )
4.8.2 Scope of tests. Special tests shall consist of such tests acceptable
to the procuring activity. Test procedures previously approved for the first
article test may be used where applicable (see 6.2.2).
4.9 Test set failure. 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 due to design defect.
c. Where practical, include a test (in the individual test) to check all
test sets for this requirement until assurance is forthcoming that the
defect has been corrected.
4.10 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
4.10.1. The life test sample will be selected by the Government inspector in
accordance with table III. (Test sets which have successfully completed the
sampling tests, reliability tests, or special tests may be selected for life