MILPRF50884F
APPENDIX A
A.4.7.2 Group C inspection. Group C inspection shall consist of the inspections specified in table AIX for
A.4.7.2.1 Inspection lot. The sample units (test coupons or production printed wiring boards) shall be randomly
selected from the inspection lot that have passed all in-process and group A inspections during that reporting period.
A.4.7.2.2 Sampling procedures. The selection of sample units and testing shall be on an annual basis. Samples
for each flexibility class (see 1.2.2) and each extent of qualification grouping based on the flexible base material type
produced during that reporting period shall be subjected to group C inspection. If no printed wiring boards were
produced during the reporting period, then group C inspection does not need to be performed.
Example: If both installation use A and B printed wiring boards were produced of adhesive flexible metal clad base
material family and only class A printed wiring boards were produced using adhesiveless flexible metal clad base
material family, then testing would be as follows:
a.
Adhesive family: Both installation use A and use B verification tests (folding flexibility and flex endurance)
would need to be performed.
b.
Adhesiveless family: Only installation use A verification test (folding flexibility) would need to be performed.
A.4.7.2.2.1 Sample unit selection. Unless otherwise specified, the following criteria shall be used in selecting
samples for group C testing:
a.
The sample units shall be for each class of product produced during that reporting period. NOTE: If only
use A printed wiring boards were produced during the reporting period, then only use A needs to be tested.
b.
The sample units shall be randomly selected from panels which have passed in-process and group A
inspection during that inspection period.
c.
The sample units can be either:
(1)
Two test coupons or sets of quality conformance test circuitry, or
(2)
Two printed wiring boards for each test to be performed.
A.4.7.2.3 Frequency. The frequency of group C testing shall be annually. The sample units shall be submitted for
testing within 30 calendar days after the end of each reporting period.
TABLE AIX. Group C inspection.
Inspection
Requirement
Method
Test specimen 1/
paragraph
paragraph
Flexibility endurance (use B)
PWB or 2/
Folding flexibility (use A)
PWB or 3/
1/
2/
A suitable singlesided portion of a type 3, 4, or 5 production printed wiring board or the test specimen
described in the applicable test method.
3/
A suitable portion of a production printed wiring board or the test coupon described in appendix H.
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