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MIL-A-81373(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 tempera-
4.4.3.3
ture 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 char-
acteristics 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 fail below the acceptance
requirement (4. 4. 3.4) at least one failure has occurred. If subse-
quent analysis reveals that several parts have deteriorated, each
shall be counted a failure, unless one caused the other parts to fail.
Preventive Maintenance - During the period of the tests no preventive
4.4.3.6
maintenance measures are required.
Special Tests - Special tests shall be conducted on a quantity of equip-
4.4.4
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 re-
liability assurance tests,
Special Test Schedule - Selection of equipments for special tests shall be
4.4.4.1
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. )
Scope of Tests - special tests shall consist of such tests as approved by
4.4.4.2
-
-
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.
9

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