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|  MIL-A-81371(AS)
4.4.3
Reliability Assurance Tests - Reliability assurance tests shall be con-
ducted as required by MIL-STD-781. "Equipments selected for reliability assurance tests
shall first have passed the individual tests.
4.4.3.1
Test Level - The test level shall be F from table I of MIL-STD-781.
4.4.3.2
Accept-Reject Criteria - Test plan V of MIL-STD-781 shall be used to
determine the accept-reject criteria for the reliability qualification test plan. Test plan VI
of MIL-STD-781 shall be used to determine the accept-reject criteria for the reliability
sampling test plan.
Length of Heat Portion of Cycle - After stabilization at the high temper-
4.4.3.3
ature limit required by the test level, the equipment shall be operated 2 hours during each
.. .
cycle.
4.4.3.4
Performance Characteristics to be Measured - The performance charac-
teristics to be measured shall be as specified in 6.10,
4.4.3.5
Failure Criteria - In addition to the requirements of MIL-STD-781, the
following requirements shall be used to determine when a failure has occurred during the
test:
(1) Whenever performance characteristics fall below the acceptance
requirement (4. 4.3. 4) at least one failure has occurred. If sub-
sequent analysis reveals that several parts have deteriorated, each
shall be counted a failure, unless one caused the other parts to fail.
4.4.3.6
Preventive Maintenance - During the period of the tests no preventive
maintenance measures are required.
4.4.4
Special Tests - Special tests shall be conducted on a quantity of equip-
ments for the purpose of checking the effect of any design or material change on the perform-
ance 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 or
reliability assurance tests.
4.4.4.1
Special Test Schedule - Selection of equipments for special tests shall be
made as follows:
(1) On an early equipment after an engineering or material change.
(2) Whenever failure reports or other information indicate additional
tests are required. (This will be determined by the procuring
,
activity. )
4.4.4.2
Scope of Tests - Special tests shall consist of such tests as approved by
the procuring activity, Test procedures previously approved for the preproduction 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.
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