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|  MIL-G-85299(AS)
a.
Complete operational test at standard laboratory 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.
c.
Environmental burn-in test specified in 4.5.1.3.
4.5.3 Reliability assurance tests. Reliability assurance tests shall be
conducted in accordance with the requirements of MIL-STD-781. Tests shall be
conducted as required for both the qualification phase and the production
acceptance (sample) phase.
4.5.3.1 Reliability q ualification phase. Prior to acceptance of test sets
under the contract or purchase order, a contractually specified quantity of
test sets (or not less than three if not specified) shall be tested in -
accordance with MIL-STD-781. For the qualification base, the test set shall
be preconditioned at a test temperature level of
to
(temperature
cycling with the unit off during the cold portion of the cycle and temperature
cycling with the unit on during the hot portion of the cycle), The accept/
reject criteria for Test Plan IVC shall be used.
4.5.3.2 Reliability acceptance phase. Production lot samples of the test
sets shall be tested in accordance with MIL-STD-781. For the sample phase.
MIL-STD-781 shall be used. The accept/reject criteria for Test Plan IVC shall
be used to determine the length of the tests (until an accept or reject
decision is reached).
4.5.3.2.1 Acceptance phase sample size. The test sets constructed during a
six month period shall be one lot. The accept/reject criteria for
MIL-STD-781, Test Plan IV shall be used to determine the length of the tests
in each lot. When specified in the contract or purchase order, no test sets
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.
4.5.4 Special tests. Special tests shall be conducted for the purpose of
checking the effect of any design or material change on the performance of the
test set and to assure adequate quality control, The test set selected for
special tests shall be selected from test sets previously subjected to the
sample or reliability assurance tests.
4.5.4.1 Special test schedule.
Selection of test sets for special tests
shall be made as follows:
a.
On early test sets after an engineering or material change.
b. Whenever failure reports or other evidences indicate that additional
tests are required.
(This will be determined by the procuring
activity.)
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