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|  MIL-F-21572(wep)
4.4.2.1 Scope of Tests -As a minimum, each equipment selected for sampling tests
shall be subjected to the following tests:
(1) Complete operational test at ambient room conditions, making all necessary
measurements to assure that all applicable specification requirements have
been met.
(2) Operational test at certain environmental conditions. The conditions may
vary for each equipment tested and should be based on results of the pre-
production and speciaI tests.
.
(3) Manufacturing reliability test specified in - 4.4.1.3, except that the test
duration shall be 30 hours.
4.4.3
Special Tests - Special tests shall be conducted on a quantity of equipments for
the purpose of checking the effect of any design or material change on the peformance of the
equipment and to assure adequate quality control The equipment selected for special tests
may be selected from equipments previously subjected to-the sampling tests.
4.4.3.1
Special Tests Schedule - Selection of equipments for special tests shall be made
as follows:
(1)
On an early production. equipment.
(2)
On an equipment midway of the production run.
(3)
On an early equipment after an engineering change.
(4)
Whenever failure reports or other information indicate additional
equipments should be tested (This will be determined by the procur-
ing activity. )
.
Exceptions from the above may be necessary when the number of equipments procured under
contract or other factors affecting performance may require a variation to assure satisfactory
control.
4.4.3.2 Scope of Tests - Special tests shall consist of such tests as are approved by
the procuring activity. Test procedures previously approved for the preproduction and sampl-
ing tests shall be used where applicable. When not applicable, the contractor shall prepare a
test procedure and submit it to the procuring activity for approval prior to conducting the tests.
As a minimum$ the following tests shall be made, except that for those equipments selected as
a result of design changes and failure reports, only those tests required to check the character-
istics in question need be conducted.
(1)
Temperature - Altitude Tests
Vibration Test (60 minutes cycling in each of 3 planes)
(2)
(3)
Humidity Tests
4.4.4
Equipment Failure - Should a failure occur during either the sampling or
special tests, the following action shall be taken: .
(1)
Determine the cause of failure.
(2)
Determine if the failure is an isolated case or design defect.
Submit to the procuring activity for approval, Proposed corrective activity
(3)
intended to reduce the possibility of the
future tests.
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