MIL-DTL-642E
4.5.1.2.1 Sampling plan. The acceptable quality levels (AQL) shall be 1.0 and 2.5 (percent defective) for
major or minor defects, respectively. Major and minor defects shall be as defined in MIL-STD-1916.
4.5.1.2.2 Rejected lots. 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 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.
4.5.1.3.1 Sampling plan. 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. 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.
TABLE II. Group B inspection.
Inspection
Requirement
Test
paragraph
paragraph
Contact resistance - - - - - - - - - - - - - -
Insulation resistance- - - - - - - - - - - - -
Dielectric withstanding voltage- - - - - -
Torque - - - - - - - - - - - - - - - - - - - - - -
4.5.1.3.3 Disposition of sample units. Sample units which have passed all the group B inspection may be
delivered on the contract, if the lot is accepted and the sample units are still within specified electrical
tolerances.
4.5.2 Verification of qualification inspection. Verification of qualification inspection shall consist of group C.
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 groups A and B shall not be delayed pending the
results of these verification of qualification inspections.
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. 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. The contractor can return to a 36-month inspection
basis by meeting requirements of 4.5.2.1.1.
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