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Page Title:
Reliability Production Acceptance Phase Tests |
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|  MIL-N-81604C(AS)
Para 4.4.3.1
(cont)
"Qualification Phase of Production Reliability Tests". The
maximum number of sets to be used shall be those listed in Table
5 of MIL-STD-781. For the qualification phase, Test Level E shall *
*
be used. The accept-reject criteria for Test Plan III shall be
used.
4.4.3.2 Reliability Production Acceptance Phase Tests - The
equipment , throughout production, shall be tested as outlined in
MIL-STD-781 (as modified herein) under the section entitled
"Production Acceptance (Sampling) phase of Production Reliability
Tests", except that all equipments produced shall be tested.
Test Level E of MIL-STD-781 shall be used.
4.4.3.2.1 All Equipment Test - Each WRA produced shall be tested
for 50 hours. Prior to the 50-hour test on each WRA, a burn-in
period may be used at the option of the contractor.
If the
*
burn-in period is to be used, the details thereof must be in-
cluded in the approved test procedures. To determine whether
the MTBF is being met at any time during the contract, the
operating test time in multiples of the specified MTBF, and the
*
failures thereon (not including burn-in failures or burn-in
operating time) shall be totaled and the results compared with
the reject line of Test Plan II of MIL-STD-781. (Extend the
line as necessary to accommodate the data.) To calculate the
test time in terms of multiples of the specified MTBF, the test
*
time shall be divided by the MTBF specified for the WRA under
test. All test time and failures accumulating under the contract
during the All Equipment Test shall be plotted on a single chart
similar to that of 4.2.9.5 of MIL-STD-781. This chart shall
combine the test data for various WRA's. These totals shall
accumulate so that, at any one time, the experience from the
*
beginning of the contract is included. At the conclusion of
each month, the test results shall be sent to the Naval Air
*
Systems Command, Attention: Avionics Division. At any time
that the current totals of test hours and test failures plotted
on Test Plan 11 curves show a reject situation, the procuring
activity shall be notified. The procuring activity reserves the
right to stop the acceptance of equipment at any time that a
reject situation exists pending a review of the contractor' s
efforts to improve the equipment, the equipment parts, the equip-
ment workmanship, etc. , so that the entire compilation will show
.
other than a reject decision.
4.4.3.3 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
138
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