MIL-PRF-1/1698D
TABLE I. Testing and inspection - Continued.
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This test shall be performed during the initial production and once each succeeding 12-calendar months in which there is
production. A zero defect sampling plan shall be used, with a sample of three tubes with an acceptance number of zero.
In the event of failure, the test will be made as a part of conformance inspection, part 2, with an acceptance level of 0.65
(see MIL-PRF-1, table III). The regular "12-calendar month" zero defect sampling plan shall be reinstated after three
consecutive samples have been accepted.
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This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
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The manufacturer, with the approval of the qualifying activity, may perform this test on a periodic basis, versus performing the test
on every lot. Approval will be based on demonstrating to the qualifying activity the capability of the design to meet this requirement.
If the design, material construction or processing of the tube is changed or if there are any quality problems, the qualifying activity
may require resumption of the original testing frequency. This allowance does not relieve the manufacturer from meeting the test
requirements in case of dispute.
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W ith qualifying activity approval the manufacturer may provide, in accordance with MIL-PRF-1, service-life guarantee, in lieu of
performing life testing. Life test endpoints specified shall apply to service-life guarantee conformance as well as to life test
conformance. The number of hours of system-deployed, accumulated tube-operating time shall be approved by the qualifying
activity and shall be a minimum of 500 hours. Service-life guarantee shall define tube operating life and not time from purchase or
delivery. Tubes sold under service-life guarantee shall be marked with contract number and with the number of tube operating
hours guaranteed.
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