MIL-PRF-27208F
TABLE VI. Group A sampling plan.
Subgroup 1
Subgroup 2
Lot size
Sampling plan
Sample plan
1
to
12
100 percent
100 percent
13
to
90
100 percent
13
91
to
150
90
13
151
to
280
125
20
281
to
500
192
29
501
to
1,200
192
34
1,201
to
3,200
192
42
3,201
to 10,000
192
50
10,001
to 35,000
294
60
35,001
to 150,000
294
74
150,001
to 500,000
345
90
500,001
and over
435
102
4.6.1.2.1.3 Subgroup 3 (solderability). A sample of five parts from each inspection lot shall be selected subjected
to the subgroup 3 solderability test. If there are one or more defects, the lot shall be considered to have failed. As an
option, the manufacturer may use electrical rejects from the subgroup 1 tests for all or part of the sample. If there are
one or more defects, the lot is rejected. The manufacturer may use one of the following options for corrective action:
a. Each production lot that was used to form the failed inspection lot shall be individually submitted to the
solderability test as required in 4.7.21. Five samples shall be selected from each production lot that formed the
failed inspection lot. Production lot samples that pass the solderability test are available for shipment.
Production lots failing the solderability test can be reworked only if submitted to the solder dip procedure in (b).
b. The manufacturer submits the failed lot to a 100 percent solder dip using an approved solder dip process in
accordance with the Appendix A section 5. Following the solder dip, the electrical measurements required in
group A, subgroup 1, tests shall be repeated on 100 percent of the lot. The PDA for the electrical
measurements shall be as for the subgroup 1 tests. An additional sample shall then be selected in
accordance with table VII and subjected to the solderability test with zero defects allowed. If the lot fails this
solderability test, the lot may be reworked a second time and retested. If the lot fails the second rework the
lot shall be considered rejected and shall not be furnished against the requirements of this specification.
TABLE VII. Solderability sampling plan.
*
Lot size
Sample size
1 to 3,200
5
3,201 to 10,000
8
10,001 to 35,000
13
35,001 and over
20
4.6.1.2.1.3.1 Disposition of samples. The solderability test is considered a destructive test and samples submitted
to the solderability test shall not be supplied on the contract.
4.6.1.3 Group B inspection. Group B inspection shall consist of the tests specified in table VIII, in the order shown,
and the sample shall be selected from inspection lots that have passed group A inspection.
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