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Page Title:
Reliability Production Acceptance (Sampling) Phase Tests |
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|  MIL-N-81497A(AS)
Qualification Phase - Prior to the acceptance of equip-
4.4.3.1
ments under the contract or order, a minimum of 3 equipments shall be tested
as outlined in MIL-STD-781, under the section entitled "Qualification Phase
of Production Reliability Tests." The maximum number of equipments to be
used shall be those listed in Table 5 of MIL-STD-781. For the Qualification
Phase, Test Levels E and Al shall be used. The Accept-Reject Criteria for
Test Plan IV shall be used.
Reliability Production Acceptance (Sampling) Phase Tests -
4.4.3.2
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." Test Level E shall be used.
All Equipment Test - Each equipment produced except those
4.4.3.2.1
submitted for the Reliability Qualification Test, shall be tested for 50 hours.
Prior to the 50 hour test on each equipment, 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 included in the approved test procedures. To determine whether
the MTBF is being met at any time during the contract the operating test hours
and the failures thereon (not counting 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.)
These totals shall accumulate so that at any one time the experience from the
beginning of the contract is included. At the conclusion of the month the
test results shall be sent to the procuring activity and to the Naval Air Sys-
tems Command, Attention:Avionics Division. At any time that the current totals
of test hours and test failures plotted on Test Plan II 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 re-
ject situation exists pending a review of the contractor's efforts to improve
the equipment, the equipment parts, the equipment workmanship, etc., so that
the entire compilation will show other than a reject decision.
Test Details - The test details such as the length of the
4.4.3.3
the test cycle, the length of the heat portion of the cycle, the performance
characteristics to be measured, special failure criteria, preventive mainte-
nance to be allowed during the test, etc., shall be part of the test procedures
to be submitted and approved by the procuring activity prior to the beginning
of the Qualification Test Phase of the Reliability Assurance Tests.
Special Tests - Special tests shall be conducted on a
4.4.4
quantity of equipments for the purpose of checking the effect of any design
or material change on the performance 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 of reliability assurance
tests.
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