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|  MIL-T-85472A(AS)
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 tests.
4.5.4.1 Special test schedule.
Selection of test sets for special tests
shall be made as follows:
On early test sets after an engineering or material change.
a.
b.
Whenever failure reports or other evidences indicate that
additional tests are required.
(This will be determined by
the procuring activity.)
4.5.4.2 Scope of tests. Special tests shall consist of such tests acceptable
to the procuring activity. Test procedures previously approved for the first
article tests may be used where applicable.
4.6 Equipment failure. Should a failure occur during the sampling,
reliability assurance 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 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.
The contractor shall furnish all samples and shall be
4.7 Life test.
responsible for accomplishing the life test. The life 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 4.7.1. The life test samples shall be selected by the Government
inspector in accordance with table III.
(Test sets which have successfully
completed the sampling tests or special tests may be selected for life tests.)
The life test may be omitted, if accumulated operating time during other
testing for a quantity of test sets is equal to or more than that listed in
table III after having received at least 300 hours each of test time.
TABLE III. Life test sample selection.
Quantity of test sets
Quantity to be selected
for life test
offered for acceptance
1
First 1
1
Next 10
1
Next 100
One for each additional 100
or fraction thereof.
4,7.1 Life test conditions. The life test shall be conducted under the
following simulated service conditions:
25
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