MIL-PRF-24236D
TABLE III. Zero defect sampling plan.
Number of switches to be tested
Lot size
Subgroup 1
Subgroup 3
All
5
1 - 15
20
5
16 - 50
20
7
51 - 90
20
11
91 - 150
20
13
151 - 280
47
16
281 - 500
47
19
501 - 1,200
53
23
1,201 - 3,200
68
29
3,201 - 10,000
77
35
10,001 - 35,000
4.5.1.2.2 Rejected lots. If an inspection lot is rejected, the lot shall be 100 percent inspected for the defects noted.
The contractor may correct the defects or remove the defective units from the lot. The lot shall then be sampled
again in accordance with table III. For acceptance, there shall be zero occurrences of defects. Such lots shall be
separate from new lots and shall be clearly identified as reinspected lots.
4.5.1.2.3 Disposition of sample units. Sample units which have passed all the group A inspection may be delivered
on the contract or purchase order, if the lot is accepted and the sample units are still within specified electrical
tolerances.
4.5.2 Periodic inspection. Periodic inspection shall consist of group B, except where the results of these
inspections show noncompliance with the applicable requirements (see 4.5.2.1.4), delivery of products which have
passed group A shall not be delayed pending the results of this qualification verification inspection.
4.5.2.1 Group B inspection. Group B inspection shall consist of the examinations and tests specified in table IV, in
the order shown. Group B inspection shall be made on sample units selected from inspection lots which have passed
the group A inspection.
4.5.2.1.1 Sampling plan. Six sample units shall be selected for each type of switch produced, within 36 months
after the date of notification of qualification and within each subsequent 36-month period. A supplier's normal quality
control tests, production tests, environmental tests, and so forth, may be used to fulfill all or part of group B
inspection; however, all of the group B inspection shall be completed as specified.
4.5.2.1.2 Failures. If one or more sample units fail to pass group B inspection, the sample shall be considered to
have failed.
4.5.2.1.3 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be
delivered on the contract or purchase order.
4.5.2.1.4 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, and so forth, and
which are considered subject to the same failures. Acceptance of the product shall be discontinued until corrective
action, acceptable to the Government, has been taken. After the corrective action has been taken, group B
inspection shall be repeated on additional sample units (all inspection, or the inspection which the original sample
failed, at the option of the Government). 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. In the event of failure
after reinspection, information concerning the failure and the corrective action taken shall be furnished to the
cognizant inspection activity and the qualifying activity.
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