MIL-STD-981C
5.6.7.4 Group B inspection. Group B inspection shall consist of the applicable group B tests (see tables XI through XV). For Class S devices, the group B inspection shall be performed on sample units selected at random from each inspection lot that passed the group A inspection. Group B inspection shall not apply to those lots from which devices are sampled for First article inspection. Group B inspection for Class B devices shall be performed when specified by the procurement document. The group B
inspection, when specified for Class B devices, shall be performed on sample units selected at
random from inspection lots which have passed the group A inspection. Group B inspection shall not apply to those lots from which devices are sampled for First article inspection.
5.6.7.4.1 Sampling plan.
5.6.7.4.1.1 Class B. The sampling plan shall be specified in the procurement document. For device qualification based on similarity, a sample consisting of three of the devices shall be subjected to applicable tests specified in TABLE IV.
5.6.7.4.1.2 Class S. Four sample units shall be subjected to the applicable group B tests. Two sample units shall be subjected to the tests of Subgroup 1 and two sample units to the tests of Subgroup 2.
5.6.7.4.2 Failures.
5.6.7.4.2.1 Class S. If the number of failures exceeds the number allowed in Tables XI through XV, the sample shall be considered to have failed. (See 5.6.7.4.4)
5.6.7.4.2.2 Class B. The number of allowable failures shall be specified in the procurement document.
5.6.7.4.3 Disposition of sample units. Disposition of sample units which have been subjected to the group B inspection shall be as specified in the procurement document.
5.6.7.4.4 Noncompliance.
5.6.7.4.4.1 Class B devices. If a sample fails to pass group B inspection, the manufacturer shall notify the procuring activity and the cognizant inspection activity of such failure and 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 and shipment of the product shall be discontinued until corrective action acceptable to the procuring 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 qualifying activity). Group A inspection may be reinstituted; however, final acceptance and shipment shall be withheld until the group B inspection has shown that the corrective action was successful. In the event of failure after reinspection, information concerning the failure shall be furnished to the cognizant inspection activity and the procuring activity.
5.6.7.4.4.2 Class S devices. If an inspection lot fails to pass group B inspection, the inspection lot shall not be delivered on the contract or purchase order. The manufacturer shall notify the procuring activity and cognizant inspection activity of the failure and take corrective action on the material or processes, or both as warranted. A failure analysis (see 5.6.7.4.4.2.1) shall be performed on the failing product and forwarded to the procuring activity. A copy of the results shall be maintained by the manufacturer.
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