MIL-PRF-31032/1B
4.2.1.1 Sample. The number of qualification test vehicle(s) to be subjected to qualification inspection shall be in
accordance with TRB approved qualification test plan.
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4.2.2 Test routine. The qualification test vehicle(s) shall be subjected to the inspections and tests specified in
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4.2.3 Qualification by similarity. A production lot may be considered qualified by similarity if the dimensional
parameters are within twenty-five percent of those currently qualified and the processing steps used are a set or
subset of those processes used for a previous qualified technology.
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4.3 Conformance inspection. Conformance inspection shall be in accordance with MIL-PRF-31032 and shall
consist of lot conformance inspection (see 4.4) and periodic conformance inspection (see 4.5).
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4.4 Lot conformance inspection. Lot conformance inspection shall be in accordance with MIL-PRF-31032 and
table I herein. Panels and printed boards to be delivered in accordance with this specification shall have been
subjected to and passed all applicable inspections and tests of table I prior to delivery of product. Lot conformance
inspection testing by subgroup or within a subgroup may be performed in any sequence.
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4.4.1 Subgroup 1 inspections (panel acceptance). The panel acceptance test shall be in accordance with
MIL-PRF-31032, and as specified in table I, subgroup 1.
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4.4.1.1 Sampling, type 3 designs. A minimum of two test coupons (one A and one B test coupon) per completed
panel shall be tested for type 3 designs. The two test coupons shall be taken from opposite corners of the panel.
After the test, one of the test coupons shall be microsectioned in the panel's length (X direction) and the other shall be
microsectioned along the panel's width (Y direction).
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4.4.1.2 Sampling, type 4 designs. In addition to the sampling required in 4.4.1.1, type 4 printed boards shall have
one additional thermal stressed coupon microsectioned for each plating process used. See 6.5 for additional
guidance.
4.4.1.3 Percent defective allowable (PDA) limits. The PDA limits for panel acceptance shall be 32 percent.
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4.4.1.4 Failure mode observations. If the microsection evaluation results indicate a potential failure mode in the
non-stressed printed board test specimens (i.e., propagation of subsurface imperfections, lifted lands within post-
thermal stress acceptance criteria, etc.), additional microsection examination of non-stressed test specimens shall be
performed.
4.4.2 Subgroup 2 inspections (100 percent inspections). The subgroup 2 inspections shall be in accordance with
MIL-PRF-31032, and as specified in table I, subgroup 2.
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4.4.2.1 PDA limits. The PDA limits for subgroup 2 inspections shall be 50 percent.
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4.4.3 Subgroup 3 inspections (sample). Panels and printed boards to be delivered in accordance with this
specification shall have been subjected to and passed all the inspections of table I, subgroups 3a, 3b, and 3c.
4.4.3.1 Sampling. A sample of printed boards (or test coupons that represent the printed boards) shall be
randomly selected from each inspection lot.
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4.4.3.2 PDA limits. When 100 percent of a production lot is inspected, either in lieu of sampling or due to rejection
of a sample inspection lot, the PDA limits for this 100 percent inspection shall be 50 percent.
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