MIL-PRF-83531C
4.4.3 Sample. The number of units comprising a sample of delay lines to be submitted for qualification
inspection shall be as specified in table I.
4.4.4 Test routine. Qualification samples shall be subjected to the tests of table I, in the order shown.
All sample units shall be subjected to the tests of Q-I. The sample delay lines shall then be divided into
three groups (see table I). The tests within each group shall be performed in the order shown.
4.4.5 Failures. Failures in excess of those allowed in table I shall be cause for refusal to grant
qualification.
4.4.6 Extent of qualification. Extent of qualification shall be applicable only for delay lines on the same
specification sheet. As a requisite for extension of qualification, the product involved must be
manufactured using the same facilities, processes, and materials as the product originally submitted for
qualification. Qualification of the lowest total delay time and highest total delay time for a given
specification sheet will extend qualification for all intermediate total delay values. Lowest delay time shall
have lowest impedance; highest delay time shall have highest impedance.
4.4.7 Retention of qualification. To retain qualification, every 24 months, the contractor shall provide
verification of the following requirements:
a. MIL-STD-790 program.
b. Design of the passive delay line has not been modified.
c. Screening tests, qualification inspections, and conformance inspections have been performed as
specified herein.
d. The contractor retains the capability to manufacture and test passive delay lines to this
specification.
e. Continued qualification to screening level C shall be based on continued maintenance of
qualification for screening level M.
In the event that no production occurred during this period, the contractor shall still verify to the qualifying
activity the capability to manufacture and test the QPL passive delay line still exists and the contractor
wants to remain on the QPL.
4.5 Conformance inspection and in-process inspection.
4.5.1 Inspection of product for delivery. For the "M" level PIN, inspection of product for delivery shall
consist of group A inspections (see 4.5.2.2). For the "C" part level number, inspection of product for
delivery shall consist of the manufacturer's inspection system (see 4.5.2.1).
4.5.1.1 Production and inspection lots.
4.5.1.1.1 Production lot. A production lot shall consist of all delay lines of a single PIN produced under
essentially the same conditions, and offered for inspection at one time.
4.5.1.1.2 Inspection lot. An inspection lot shall consist of all delay lines of the same specification sheet
manufactured under the same processes and conditions during a manufacturing period of 1 month
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