MIL-PRF-39019F
4.7 Periodic group B inspection. Periodic inspection shall consist of group B inspection. Except where the results
of these inspections show noncompliance with the applicable requirements (see 4.7.1.4), delivery of products which
have passed group A inspection shall not be delayed pending the results of these qualification verification
inspections.
4.7.1 Group B inspection. Group B inspection shall consist of the examinations and tests specified in table III, in
the order shown. Group B inspection shall be made on sample units selected from inspection lots which have passed
the group A inspection. Contractors that have successfully retained the qualification products listing in accordance
with 4.5 shall not be required to perform group B inspection.
4.7.1.1 Sampling plan. Eighteen sample units shall be selected from those covered by a single specification
sheet, 24 months after the date of notification of qualification, and after each subsequent 24 month period. When
periodic inspection is performed for circuit breakers covered by two specification sheets which are identical, except
that one covers circuit breakers with auxiliary contact terminals, equal quantities of sample units with and without
auxiliary contacts shall be selected. The 18 sample units shall be composed of six groups of three each. Each three
unit group shall be composed of circuit breakers specified by the qualifying activity.
4.7.1.2 Failures. If one or more sample units fail to pass group B inspection, the sample shall be considered to
have failed.
4.7.1.3 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be
delivered on the contract or order.
4.7.1.4 Noncompliance. If a sample fails to pass group B 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, 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 B 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 inspection may be reinstituted; however, final acceptance shall be withheld until the
group B 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.
4.8 Method of examination and test.
4.8.1 Visual and mechanical examination. Circuit breakers shall be examined to verify that dissimilar metals,
interface, physical dimensions, marking, and workmanship are in accordance with the applicable requirements (see
4.8.1.1 Resistance to solvents (see 3.25.3). Circuit breakers shall be tested in accordance with the resistance to
solvents test, method 215 of MIL-STD-202. The following details and exceptions shall apply.
a.
Portion to be brushed: All marking.
b.
Number of specimens to be tested: Four; two in solution of 2.1c (terpene) and two in isopropyl alcohol,
American Chemical Society (ACS) reagent grade, or isopropyl alcohol in accordance with TT-I-735, grade A
or B.
c.
Examination: Specimens shall be examined for legibility of marking.
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