MILPRF50884F
APPENDIX A
A.4.7 Periodic conformance inspection. Periodic conformance inspection shall consist of groups B and C
inspection. Except where these inspections show noncompliance with the applicable requirements (see A.4.7.1.4
and A.4.7.2.4), delivery of printed wiring boards which have passed in-process and group A inspection shall not be
delayed pending the results of these periodic inspections. Periodic inspections shall be performed at a certified
suitable laboratory (see A.6.5).
A.4.7.1 Group B inspection. Group B inspection shall consist of the inspections specified in table AVIII.
A.4.7.1.1 Inspection lot. The sample units (printed wiring board test specimens) shall be randomly selected from
the most complex printed wiring board (see A.7.2) inspection lot or lots that has passed all in-process and group A
inspections during that production month (i.e., the group B reporting period). The most complex printed wiring boards
shall be as determined by the manufacturer using its definition of complex (see A.7.2), subject to approval by the
qualifying activity.
A.4.7.1.2 Sampling procedures. Sample units for each extent of qualification base material type family (see
E.4.1.4) produced during that reporting period shall be subjected to group B inspection. Because of the performance
nature of this document, the design details of the printed wiring boards represented by the sample units will need to
be supplied to the testing facility (see A.6.7).
A.4.7.1.2.1 Sample unit selection. Except for the case of a 1 panel inspection lot, the sample units shall be
selected from different panels. Unless otherwise specified in A.4.8.3.2 (resistance to solvents) or A.4.8.4.11 (surface
peel strength), the following criteria shall be used in selecting samples for group B testing:
a.
The sample units shall be from the most complex (see A.7.2) printed wiring board design produced that
calendar month that allow for each test to be performed.
b.
The sample units shall be randomly selected from panels which have passed group A inspection during that
calendar month.
c.
The sample units can be either:
(1)
Two sets of quality conformance test circuitry, or
(2)
Two test coupons for each test to be performed.
Eight foil lamination peel strength specimens shall be selected from two different production lots; four from each lot or
100 percent if the number of coupons available is less than four for a production lot. If only one foil laminated lot is
produced in a calendar month, then only the test coupons from that lot shall be submitted.
A.4.7.1.3 Frequency. The frequency of selecting sample units and performing group B testing shall be on a
monthly basis. The sample units shall be submitted for testing within 30 calendar days after the end of each reporting
period.
A.4.7.1.4 Failures. If one or more sample units fail to pass group B inspection, the sample shall be considered to
have failed. The qualifying activity shall be notified of any group B failure within 3 business days. Group B inspection
shall be repeated on additional sample units (either all group B inspections or just the group B inspection which the
original sample failed, at the discretion of the qualifying activity) from the next most complex (see A.7.2) inspection lot
from the same month that the failure occurred. Group A inspection and shipment of the product represented by the
failed group B sample shall be discontinued.
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