MIL-DTL-12285F
TABLE III. Zero defect sampling plan.
Minimum number of
Lot Size
switches to be tested
1/
1-8
All
9 - 50
5
51 - 90
7
91 - 150
11
151 - 280
13
281 - 500
16
501 - 1,000
19
1,201 - 3.200
23
3,201 - 10,000
29
10,001 - 35,000
35
1/ For lot sizes that are less than the required
sample size, all switches shall be tested.
4.6.2 Periodic inspection.
4.6.2.1 Group B inspection. Group B inspection shall be completed in accordance with table IV, in the
order shown, within each 3-year period after initial qualification. When a manufacturer has switches
qualified under various MS standards or specification sheets, the qualifying activity may authorize group
B tests that do not require redundant testing on similar product features. Group B inspection shall be
performed on sample units that have been produced, using the same manufacturing facilities and
processes normally used in production and which have passed group A inspection. A manufacturer's
normal quality control tests, production tests, and environmental tests may be used to fulfill all or part of
group B inspection; however, all of group B inspection shall be completed as specified. Data used may
be accumulated within the previous 24 months.
4.6.2.1.1 Sampling plan. The sampling plan and test procedures shall be as specified in the appendix
to this specification. The sample units shall be selected from current production. If switches are not in
current production, they may be selected from stock; however, all switches shall be date coded within 24
months of the required group B submittal date. When there has been no production of a particular type of
switch for a 3-year period, sample units shall be selected from the next production lot presented for
acceptance and for each subsequent 3-year period.
4.6.2.1.2 Noncompliance. If a sample fails to pass group B inspection, the supplier shall take
corrective action on the materials or processes, or both, as warranted, and on all units of product which
can be corrected and which were manufactured under essentially the same conditions, with essentially
the same materials, processes, etc., and which are considered subject to the same failure. Acceptance
of the product shall be discontinued until corrective action, acceptable to the preparing activity, has been
taken. After the corrective action has been taken, group B inspection shall be repeated on additional
sample units (all inspections, or the inspection which the original sample failed, at the option of the
preparing activity). Group A inspection may be reinstituted; however, final acceptance shall be withheld
until the group B reinspection has shown that the corrective action was successful.
6
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