MIL-PRF-39019F
4.4 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable to the
Government (see 6.3) on sample units produced with equipment and procedures normally used in production.
4.4.1 Sample size. The number of circuit breakers to be subjected to qualification inspection shall be as specified
in the appendix to this specification.
4.4.2 Inspection routine. Sample units, grouped as specified in the appendix, shall be subjected to the
qualification inspection specified in table III, in the order shown. All 36 sample units shall be subjected to the
inspection of group I. Then the 36 sample units shall be allocated as follows into six 6-unit groups, as specified in the
appendix, and subjected to the inspection for their particular group.
Group II:
One 6-unit group covering the highest current rating.
Group III, IV, and V:
One 6-unit group each; each 6-unit group uniformly composed of circuit breakers at either
the highest or lowest current rating at the option of the supplier.
Group VI
One 6-unit group covering the highest current rating and one 6-unit group covering the
lowest current rating.
4.4.2.1 Time delay C. Six sample units (three each at the highest and lowest current rating) shall be subjected to
the inspection specified in table III.
4.4.3 Failures. One or more failures shall be cause for refusal to grant qualification approval.
4.5 Verification of qualification. To retain qualification, the contractor shall provide verification to the qualifying
activity for the following items every 12 months:
a.
Design of the circuit breaker has not changed.
b.
Verification that the conformance inspections have been performed on inspection lots supplied to the
requirements of this specification.
c.
Verification that the periodic inspections have been performed as applicable. The inspections shall consist of
the examinations and tests specified in table IV in the order shown. If test results indicate nonconformance
with specification requirements, and corrective action acceptable to the qualifying activity has not been taken,
action may be taken to remove the failing product from the QPL.
In the event that no production has occurred in this period, the contractor shall still verify to the qualifying activity that
the capacity to manufacture and test QPL circuit breakers still exists and that the contractor wants to remain on the
QPL.
4.5.1 Failures. If one or more sample units fail to pass verification of qualification inspection, the sample shall be
considered to have failed.
4.5.2 Disposition of sample units. Sample units which have been subjected to the inspections in table IV shall not
be delivered on the contract or order.
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