MIL-PRF-28750F
TABLE III. Group B inspection.
Test
Number
Number
Inspection
Requirement
method
of
of
paragraph
paragraph
sample
failures
units
allowed
Vibration
Terminal strength
Moisture resistance
4
0
Insulation resistance
Electrical characteristics
Seal
Visual and mechanical inspection
4.6.2.1.1 Sampling plan. Four sample units from each specification sheet shall be selected every six months from
sample SSR's which have passed group A inspection. No failures shall be allowed. If the manufacturer can
demonstrate this test has been performed for five consecutive times with zero failures, the frequency of this test, with
the approval of the qualifying activity, can be performed on an annual basis. If the design, technology, or processing
of the part is changed, or if there are any quality problems or failures, the qualifying activity may require resumption of
the original test frequency.
4.6.2.1.2 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be
delivered on the contract or purchase order.
4.6.2.2 Group C inspection. Group C inspection shall consist of the tests specified in table I, in the order shown.
Group C inspection shall be made on sample units selected from inspection lots which have passed the group A
inspection.
4.6.2.2.1 Sampling plan. Twelve sample SSR's of the same PIN as originally qualified shall be selected 24 months
after the date of every notification of qualification, and after each subsequent 24-month period.
4.6.2.2.2 Failures. Failures in excess of those allowed in table I shall be cause for removal of qualification.
4.6.2.2.3 Disposition of sample units. Sample units which have been subjected to group C inspection shall not be
delivered on the contract or purchase order.
4.6.2.2.4 Noncompliance. If a sample fails the group B or group C inspection, the manufacturer shall notify the
qualifying activity and the cognizant inspection activity of such failure and take corrective action on the materials or
processes, or both, as warranted. This corrective action shall be performed on all units of product which can be
corrected; which were manufactured under essentially the same materials and processes; and which are subject to
the same failure. Acceptance and shipment of the product shall be discontinued until corrective action, acceptable to
the qualifying activity, has been taken. After the corrective action has been taken, group C 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 and group B inspections may be reinstituted; however, final acceptance and
shipment shall be withheld until the group C 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 qualifying activity.
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