MIL-DTL-28748D
4.6 Group C inspection (periodic). Periodic inspection shall consist of a 12-month inspection and a 36-month
requalification. Delivery of products, which have passed groups A and B inspections, shall not be delayed pending results of
these periodic inspections. Upon passing this inspection two consecutive times, the supplier may select sample connectors
every 36 months. If production of a particular PIN is not current, the periodic inspection tests shall take place at the time
production is resumed. The testing shall revert to the original schedule, which is applied to a newly qualified product.
4.6.1 Group C inspection. Group C inspection shall consist of the examinations and tests specified in table XIV, in the
order shown. Group C inspection shall be made on sample units selected from inspection lots, which have passed the groups
A and B inspection.
4.6.1.1 Sampling plan. Six mated pairs of the smallest, medium (exact middle or next higher), and largest insert for every
design type. Forty sets of nonremovable pin and socket contacts shall be selected from current production after 200,000
connectors of each PIN have been produced or once every 36 months, whichever occurs first.
All sample units are to contain a proper mix of hardware for which the manufacturer has approval of sample units of each PIN
of connector. The six sets of connectors shall be divided into three groups and two pairs each shall be subjected to groups I,
II, and III tests of table XIV. The 40 sets of nonremovable pin and socket contacts shall be divided into two groups for the
tests of groups IV and V of table XIV.
A design type is defined as a style represented per military specification sheet. Therefore, a company qualified to two slash
sheets would test six mated pairs or 12 mated pairs if qualified to four slash sheets, etc.
4.6.1.2 Noncompliance. If a sample fails to pass group C inspection, the contractor 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 Government, has been taken. After the corrective action has been taken, group C 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 and B inspections may be reinstituted; however, final acceptance shall be withheld until the group C reinspection has
shown that the corrective action was successful. In the event of failure after reinspection, information concerning the failure
and corrective action shall be made available to the cognizant inspection activity and to the qualifying activity.
4.6.1.3 Defectives. Any failures of the samples tested in table XIV, the entire lot is considered to have failed.
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