MIL-PRF-11693E
4.4.4 Failure rate (FR) qualification (applicable to ER parts only). FR qualification for capacitors shall be in
accordance with the general and detailed requirements of MIL-STD-690 and as follows.
a. Procedure I: Qualification at the initial FRL. Level "M" (1.0 percent) of FRSP-90 shall apply. Sample units
b. Procedure Ill: Maintenance of FRL qualification. Maintenance period B of FRSP-10 shall apply. Regardless
of the number of production lots produced during this period, the specified number of unit hours shall be
accumulated to maintain qualification.
4.4.5 Quality level verification (ER styles only). The manufacturer is responsible for establishing a quality system
to assess the ppm defect level of lots that are subjected to subgroup 2 tests of the group A inspections. The ppm
defect level shall be based on a 6-month moving average.
4.5 Verification of qualification (ER styles). Every 6 months the manufacturer shall compile a summary of the
results of qualification conformance inspections and extended FR test data, in the form of a verification of qualification
report, and forward it to the qualifying activity whenever the FR data indicates that the manufacturer has failed to
maintain the qualified FR level, or the group B inspection data indicates failure of the qualified product to meet the
requirements of this specification. Continuation shall be based on evidence that over the 6-month period the
following has been met:
a. MIL-STD-790 program.
b. The capacitor design has not been modified.
c. Lot rejection for group A inspection does not exceed 5 percent or one lot, whichever is greater.
d. The requirements for group B inspection are met.
e. Verification of FRLs.
f. PPM assessment.
When group B requirements were not met and the manufacturer has taken corrective action satisfactory to the
qualifying activity, group B retesting shall be instituted. A summary of the retesting shall be forwarded to the
qualifying activity within 30 days after completion of the retest.
In the event that there is no production of a single style device during a maintenance period and the manufacturer is
listed for more than one style on the QPL, the manufacturer shall certify that they retain the capabilities and facilities
necessary to produce that product. However, the manufacturer shall still maintain the required number of unit hours
in the maintenance period using those styles produced in order to remain qualified to the applicable failure rate levels.
Styles need not be manufactured for testing only but the manufacturer must certify that the capability and facilities
needed to produce that style are still in place. In the event that units must be built for the purpose of maintaining the
required hours, they shall also undergo all required testing prior to being placed on life test and be subjected to all
group B requirements.
4.5.1 Verification of qualification (non-ER styles). Every 6 months the manufacturer shall compile a summary of
the results of qualification conformance inspections in the form of a verification of qualification report, and forward it to
the qualifying activity whenever the group B inspection data indicates failure of the qualified product to meet the
requirements of this specification. Retention of qualification of an ER style will also retain qualification of
corresponding non-ER style (e.g., CZR23 and CZ23).
Failure to submit the report within 30 days after the end of each 6 month period may result in loss of qualification for
the product. In addition to the periodic report, the supplier shall immediately notify the qualifying activity at any time
during the 6 month period that the inspection data indicates failure of the qualified product to meet the requirements
of this specification.
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