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|  MIL-G-85231(AS)
Manufacturing run-in tests specified in 4.5.1.3 except that
c.
the test duration shall be 120 hours with no restrictions on
the number of failures. However, each failure shall be
analyzed as to cause and remedial action necessary to reduce
the possibility of its recurrence in future control groups.
4.5.3 Reliability assurance tests. Reliability assurance tests shall be
conducted in accordance with MIL-STD-781. Tests as required by both the
qualification phase and the production acceptance (sampling) phase shall be
conducted.
4.5.3.1 Qualification phase. Prior to the acceptance of control groups
under the contract or purchase order, a minimum of three control groups shall
be tested in accordance with MIL-STD-781, under the section entitled
"Qualification Phase of Production Reliability Tests". The maximum number of
control groups to be used shall be those listed in table V of MIL-STD-78l.
For the qualification phase, Test Level E shall be used. The accept-reject
criteria for Test Plan IV shall be used.
4.5.3.2 Reliability sampling phase tests. Samples of the control group
shall be tested In accordance with MIL-S 781 under the section entitled
"Sampling Phase of Production Reliability Tests". For the sampling phase,
Test Level E shall be used, except that the control group shall operate
continuously. The accept-reject criteria for Test Plan V shall be used to
determine the length of the tests (until an accept or reject decision is
reached).
4.5.3.2.1 Lot size for sampling phase. The control groups constructed
during a two-month period shall be specified as one lot. The accept-reject
criteria for Test Plan IV shall be used to determine the length of the tests
in each lot. Unless otherwise specified in the contract of purchase order, no
control groups shall be shipped until an accept decision is reached under each
lot (see 6.2.1).
4.5.3.3 Test details. The test details such as the length of the test
cycle, the length of the heat portion of the cycle, the performance
characteristics to be measured, special failure criteria, and preventive
maintenance to be allowed during the test, shall be part of the test
procedures to be made available and accepted by the procuring activity prior
to the beginning of the qualification test phase of the reliability assurance
tests (see 6.2.2).
4.5.4 Special tests. Special tests shall be conducted for the purpose of
checking the effect o f any design or material change on the performance of the
control group and to assure quality control. The control group selected for
special tests may be selected from control groups previously subjected to the
sampling or reliability assurance tests.
4.5.4.1 Special tests schedule. Selection of control groups for special
tests shall be made as follows:
a.
On an early control group, after an engineering or material
change.
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