MILPRF55110G
APPENDIX A
A.4.7
A.4.7 Periodic conformance inspection. Periodic conformance inspection shall consist of group B inspection.
Except where these inspections show noncompliance with the applicable requirements (see A.4.7.1.4), 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
A.4.7.1 Group B inspection. Group B inspection shall consist of the tests specified in table AV. All tests in
subgroup 1 tests shall be performed. Tests in subgroup 2 are dependant on printed wiring board construction
techniques and if compliance testing was performed during group A.
A.4.7.1.1
A.4.7.1.1 Inspection lot. The sample units shall be randomly selected from an inspection lot or lots that have
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. If all the inspections in table AV cannot be performed on the
most complex lot of the month, additional sample units from other designs shall be submitted if they address the
technology to be verified.
A.4.7.1.2
A.4.7.1.2 Sampling procedures. Samples for each base material type groupings (see A.4.5.4.2) produced during
that reporting period shall be subjected to group B inspection. The extent of qualification of types allowed by
A.4.5.4.1 shall apply. The following criteria shall be used in selecting samples for group B testing:
Rework simulation and MIR. The sample units shall be from the most complex (see A.7.2) printed wiring
a.
board design produced that calendar month. Because of the performance nature of this document, the
design details of the test coupons or the printed boards that they represent shall be supplied with the sample
units so that proper verification can be confirmed (see A.6.7). 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.
b.
Surface peel strength. When multiple lots using foil lamination are available, a minimum of eight peel
strength specimens shall be selected from at least two different production lots; a maximum of 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 available for a calendar month, then only the test coupon(s) from that lot shall be
submitted for testing.
c.
Resistance to solvents. The test specimens can be either whole or parts of production printed wiring boards
or quality conformance test circuitry strip identification areas containing ink or paint marking. The minimum
number of samples shall be at least one sample for each solution specified by the applicable test method
(i.e., one sample for each solution required).
Example: The most complex lot using FR-4 base material did not use ink or paint marking, foil lamination
construction, and was a surface mount only design. However, other compliant lots constructed that month of
legacy types GF and GH base materials (within the same base material grouping) did use ink or paint
marking, foil lamination, and though-hole mounting. The group B inspection lot for that month shall contain
samples from more than one design (or part number) or lot of printed board design in order to comply. The
exact breakdown of 5 different part numbers for the group B submission could be as follows:
(1)
Part number "A" for the MIRDWV test, the most complex design of the month. Although part
number "A" it is a SMT only design with no component size holes, it still can and must be used
because the test coupon hole size is determined by IPC-2221 for SMT designs.
(2)
Part numbers "B" and "D" for surface peel strength testing.
(3)
Part number "C" for rework simulation testing. Part number "C" is the third most complex design
produced that month, but it is the most complex design using component holes.
(4)
Part numbers "B", "D", and "E" for resistance to solvents testing since this test is not being
preformed during group A on a lottolot basis.
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