 |
|||
|
|
|||
| ||||||||||
|
|  MIL-T-81404B(AS)
Manufacturing run-in test specified in 4.5.1.3 except that
c.
the test duration shall be 120 hours with no restriction 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 test sets.
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 test sets under
the contract or purchase order, a minimum of three test sets shall be tested
in accordance with MIL-STD-781, under the section entitled "Qualification
Phase of Production Reliability Tests". The maximum number of test sets to be
used shall be those listed in table V of MIL-STD-781. 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 test set shall
be tested in accordance with MIL-STD-781 under the section entitled "Sampling
Phase of Production Reliability Tests". For the sampling phase, Test Level E
shall be used. The accept-reject criteria for Test Plan VI 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 entire contract quantity
(with the exception of those test sets used in the Qualification Phase) shall
be considered one lot. The test program shall start the first month after the
Qualification Phase has been completed. Samples shall be selected and placed
on test in the same manner as though one month's production was a lot. The
samples shall be tested until an accept or reject decision is reached. In the
meantime other test sets constructed shall be shipped. The test results shall
be summarized monthly for the procuring activity (see 6.2.2). The procuring
activity reserves the right to stop the acceptance of test sets any time after
one or more reject decisions have been reached, pending a review of the
contractor's efforts to improve the test sets, the test sets parts, the test
set quality control, etc., so that the entire contract quantity will show an
accept decision.
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 of any design or material change on the performance of the
test set and to assure adequate quality control. The test sets selected for
special tests may be selected from test sets previously subjected to the
sampling or reliability assurance tests.
16
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals