MIL-PRF-87164A
4.5 Verification of qualification. To retain qualification, every 12 months the manufacturer shall provide verification
of qualification to the qualifying activity. Continued qualification is based on meeting the following:
a.
MIL-STD-790 program.
b.
The capacitor design has not been modified.
c.
Lot rejection for group A, subgroup1, inspection does not exceed 5 percent.
d.
The requirements for group C inspections are met.
In the event that there is no production of a single style device during a reporting 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. If during two 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 representative
product of that style to testing.
4.6 In-process inspection and conformance inspection.
4.6.1 Inspection lot. An inspection/production lot shall consist of all the capacitors of a single nominal
capacitance/voltage rating of one design, and processed as a single lot continuously through all manufacturing steps
on the same equipment, and identified with the same date and lot code designation. The lot may contain all
available capacitance tolerances for the nominal capacitance value as well as adjacent values. In addition, the lot
shall conform to the following:
a.
Materials such as silver, foil, terminations, solder, lead material, etc., shall be uniform in quality and from a
single supplier.
b.
The lot code number shall be assigned at or before assembly.
c.
Traceability to the operator and the date each operation was performed shall be maintained.
d.
Lot identity shall be maintained from the time the lot is assembled to the time it is accepted.
e.
The tests of solderability and resistance to solvents shall be made on each production lot according to table
VII.
4.6.2 In-process inspection. As part of the MIL-STD-790 QPL system, the manufacturer shall establish and
document a 100 percent inspection procedure for the following:
a.
Silvered mica visual inspection (4X minimum magnification) prior to assembly.
b.
Pre-encapsulation inspection (4X minimum magnification) which shall include lead attachment and general
workmanship.
4.6.2.1 Rework. Rework is not allowed on any operation except for marking and lead rework unless approved by
the qualifying activity.
4.6.3 Inspection of product for delivery. Inspection of product for delivery shall consist of group A inspection.
4.6.3.1 Group A inspection.
4.6.3.1.1 Subgroup 1. Subgroup 1 tests of Table V shall be performed on 100 percent of the product supplied
under this specification. Failure to meet a 5 percent defective allowable (PDA) shall be cause for lot rejection and
the lot shall not be resubmitted.
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