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MIL-T-81404B(AS)
The test set shall be vibrated (without vibration isolators) for a period of
10 minutes prior to the beginning of the six period of operation. Where
feasible, the test set shall be operated during this vibration for the purpose
of detecting flaws and imperfect workmanship. The direction of vibration
should be vertical to the normal mounting plane for five minutes and lateral
to that plane for five minutes.  Where it is not feasible to vibrate the
test set in two directions the vertical direction shall be used.  During the
six hour period of operation following the 10-minute vibration period, the
test set shall be mechanically cycled periodically through its various phases
of operation.  Should a failure occur, it shall be repaired and the test
started over, except that the 10-minute vibration period need not be repeated
when it is certain the failure was not a result of the vibration.  Should
repetitive failures occur, corrective action shall be taken to eliminate this
defect from future test set.  A record shall be kept of all failures. The six
hour period specified above may be composed of two 3-hour periods to conform
with standard working hours.
4.5.2 Sampling tests. Test sets selected for sampling tests shall first
have passed the individual tests.  Test sets will be selected for sampling
tests by the government inspector in accordance with table V.
4.5.2.1  Scope of sampling tests.  As a minimum, each test set selected
for sampling tests shall be subjected to the following tests:
TABLE V.
Sampling tests sample selection.
Quantity of Test Sets
Quantity to be Selected
Offered for Acceptance
for Sampling
First 10
1
Next 50
1
Next 75
1
Next 100
1
1 for each additional
200 or fraction thereof
Sampling Tests are not required when Reliability Assurance Tests are
conducted.
a. Complete operational test at ambient room conditions, making
all necessary measurements to assure that all applicable
specification requirements have been met.
b.
Operational test at certain environmental conditions. The
conditions may vary for each test set tested and should be
based on results of the first article, individual, and
special tests.

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