MIL-PRF-18546G
TABLE V. Group A sampling plan.
Lot size
Subgroup 1
Subgroup 2
sample size
Sample size
2 to
13
100 percent
100 percent
14 to
125
100 percent
13
126 to
150
125
13
151 to
280
125
20
125
281 to
500
29
501 to 1,200
125
34
1,201 to 3,200
125
42
3,201 to 10,000
192
50
10,001 to 35,000
60
294
35,001 to 150,000
74
294
90
150,001 to 500,000
345
102
500,001 and over
435
4.6.2.3.2 Rejected lots. In the event of one or more defects, the inspection lot is rejected. The
manufacturer may use one of the following options to rework the lot:
a. Each production lot that was used to form the failed inspection lot shall individually submitted to
the solderability test as required in 4.7 3. Production lots 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 4.6.2.3.2b.
b. The manufacturer submits the failed lot to a 100 percent solder dip using an approved solder dip
process in accordance with 3.4.3.1. Following the solder dip, the electrical measurements
required in group A, subgroup 2 tests shall be repeated on 100 percent of the lot. The Percent
Defective Allowable (PDA) for the electrical measurements shall be as for the subgroup 1 tests.
Five additional samples shall then be selected and subjected to the solderability test with zero
defects allowed. If the lot fails this solderability test, the lot shall 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.
4.6.2.3.2.1 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.
4.6.3 Group B inspection. Group B inspection shall consist of the test specified in table VI, in the order
shown. They shall be performed on sample units that have been subjected to and have passed the group
A inspection, unless the Government considers it more practical to select from the lot for group B
inspection.
4.6.3.1 Sampling plan. A sample of 13 parts (highest value) shall be randomly selected. If one or
more defects are found, the lot shall be rescreened and defects removed. After screening and removal of
defects, a new sample of 13 parts shall be selected. If one or more defects are found in the second
sample, the lot shall be rejected and shall not be supplied to this specification.
4.6.3.2 Deposition of sample units. Sample units which have been subjected to group B inspections
may be delivered on the acquisition document provided they are within resistance tolerance.
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