MIL-DTL-9177C
4.5.1.3 Group B inspection. Group B inspection shall consist of the inspections specified in table II, in the
order shown, and shall be made on sample units which have been subjected to and have passed the
group A inspection.
TABLE II. Group B inspection.
Inspection
Requirement paragraph
Test method paragraph
Contact resistance
Insulation resistance
Dielectric withstanding voltage
Torque
3.6.13
Insertion and withdrawal forces
4.5.1.3.1 Sampling plan (group B inspection). The sampling plan shall be in accordance with MIL-STD-
1916 for special inspection level S-4. The sample size shall be based on the inspection lot size from
which the sample was selected for group A inspection. The AQL shall be 4.0 percent defective.
4.5.1.3.2 Rejected lots (group B inspection). If an inspection lot is rejected, the contractor may rework it
to correct the defects, or screen out the defective units, and resubmit for reinspection. Resubmitted lots
shall be inspected using tightened inspection and shall not thereafter be tendered for acceptance unless
the former rejection or requirement of correction is disclosed. Such lots shall be separate from new lots,
and shall be clearly identified as reinspected lots.
4.5.1.3.3 Disposition of sample units. Sample units which have passed all group B 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 C inspection. Except where the
results of this inspection show noncompliance with the applicable requirements (see 4.5.2.1.4), delivery of
products which have passed groups A and B inspections shall not be delayed pending the results of this
periodic inspection.
4.5.2.1 Group C inspection. Group C inspection shall consist of the inspections specified in table III, 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 inspections.
4.5.2.1.1 Sampling plan (group C inspection). Twelve sample units of each basic type shall be selected
at random from items produced every 24- or 36-months, as applicable (see 4.4.4). The sample units shall
be subdivided as specified for each subgroup in table III.
4.5.2.1.2 Failures. If any sample units fail to pass group C inspection, the entire sample shall be
considered to have failed and if the contractor has been inspecting on a 36-month basis as permitted in
4.4.4, he shall revert to a 24-month testing basis. He can return to a 36-month inspection basis by
meeting requirements of 4.5.2.1.1.
4.5.2.1.3 Disposition of sample units. Sample units which have been subjected to group C inspection
shall not be delivered on the contract or purchase order.
4.5.2.1.4 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 inspections, or the inspection which the original sample failed, at the option of the
Government). Groups A and B inspections may be reinstituted; however, final acceptance shall be
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