MIL-DTL-21604F
4.7.1.4 Group B inspection. Two switches of each contact configuration produced during each 12-month period
following qualification shall be selected from the lot and subjected to the examination and tests specified in table VI in
the order listed. If a specification sheet covers both positive detent and momentary action mechanisms, one sample
shall be positive detent and one sample shall be momentary action. Samples selected shall have passed the group A
inspection specified in 4.7.1.2. No samples are required for testing during the year that the group C tests are
completed and submitted. Sample switches which have been subjected to group B inspection shall not be offered for
delivery.
TABLE VI. Group B inspection.
Examination and
Examination or test
Requirement
test method
Visual and mechanical examination
3.20 and 3.21
Circuit configuration
Torque
Endurance
Temperature rise
Contact resistance
Seal (style JF only)
Dielectric withstanding voltage
Insulation resistance
Torque
Circuit configuration
Visual and mechanical examination
3.20 and 3.21
4.7.2 Qualification verification inspection. Qualification verification inspection shall consist of group C inspection.
Except where the results of these inspections show noncompliance with the applicable requirements (see 4.7.2.2),
delivery of products which have passed groups A and B shall not be delayed pending the results of these qualification
verification inspections.
4.7.2.1 Group C inspection. The number of sample switches shall be as specified in 4.5.1 and shall be submitted
36 months after the date of notification of qualification, and after each subsequent 36-month period, when production
of a particular type of switch has been suspended for 24 months, sample switches shall be selected from the first lot
of the new production following this period. The sample switches shall be subjected to the examination and tests
specified in table II in the order listed. Samples selected shall have passed the group A inspection specified in
4.7.1.2 and shall be taken from production which occurred during the last year of the reporting period. Sample
switches which have been subjected to group C inspection shall not be offered for delivery.
4.7.2.1.1 Group C suspension. At the request of the manufacturer, group C testing may be suspended with the
qualifying activity's approval. If the design, material, construction, or processing is changed or if there are any quality
problems or failures, the qualifying activity may require resumption of the original testing requirements. Regardless of
reduction of tests, the manufacturer shall supply product capable of passing the prescribed tests.
4.7.2.2 Noncompliance. If a sample fails to pass group B or group C inspection, the supplier 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 and processes
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 B
or group C inspection shall be repeated on additional sample units (all inspection, or the inspection which the original
sampled failed, at the option of the Government). Group A inspection may be reinstituted; however, final acceptance
shall be withheld until the group B or group C reinspection has shown that the corrective action was successful. In
the event of failure after reinspection, information concerning the failure and the corrective action taken shall be
furnished to the cognizant inspection activity and the qualifying activity.
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