MIL-PRF-19978K
4.4.1 Sample size. The number of capacitors to be submitted for qualification inspection shall be as specified in
table IX or appendix A.
4.4.2 Inspection routine. Capacitors shall be subjected to the qualification inspection specified in table IX in the
order shown. All sample units shall be divided as specified in table IX for groups I through VIII inclusive, and
subjected to the inspection for their particular group; for combined voltage group submissions, each type shall be
equally represented in each group.
4.4.3 Failures. Failures in excess of those allowed in table IX shall be cause for refusal to grant qualification
approval.
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
shall be subjected to the qualification inspection specified in group VI, table IX (see 4.4.2). The entire life
test sample shall be continued on test to 6,000 hours as specified in 4.7.20.3, upon completion of the 2,000
hour qualification.
b. Procedure II: Extension of qualification to lower FRLs. To extend qualification to the "R" (0.01 percent) and
"S" (0.001 percent) FRLs, data from two or more styles of similar construction (see 4.6.1.1.1) may be
combined.
c. 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 (see 4.6.1). Data from MIL-PRF-83421/6 (CRH31, CRH32,
CRH33, CRH34, and CRH35), may be used to maintain FRL qualification of style CQR44.
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 only). Every 12 months the manufacturer shall provide verification of
qualification to the qualifying activity. Continuation of qualification shall be based on meeting the following
requirements:
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.
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. In the case where the lowest failure rate for an un-produced style is M, 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. If during three consecutive reporting periods there has been no
production of a given style, the manufacturer may be required, at the discretion of the qualifying activity, to submit a
newly-produced (not from stock) representative product of that style to testing.
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