MIL-PRF-49464C
4.7 Periodic group B inspection. Periodic group B inspection shall consist of the tests specified in table VII in the
order shown, and shall be performed on sample units selected from lots that have passed group A inspection.
Capacitor styles manufactured during each 3-month or 6-month period, as applicable, shall be represented, as far as
practical, in at least the approximate ratio of production. Except where the results of this inspection show
noncompliance with the applicable requirements (see 4.7.3), delivery of products that have passed group A
inspection shall not be delayed pending the results of this periodic inspection.
4.7.1 Sampling plan.
4.7.1.1 Subgroups 1 and 2. 24 sample units shall be taken from production every 6 months and subjected to the
applicable tests for their particular subgroup. Permitted failures shall be as specified in table VII.
4.7.1.2 Subgroup 3. A minimum of 25 sample units per style of the highest capacitance value produced shall be
selected from the first inspection lot produced during a 6-month period. Permitted failures shall be as specified in
MIL-STD-690. The accumulated data shall be used for maintenance and extension of FR qualification.
4.7.2 Disposition of sample units. Sample units that have been subjected to group B inspection shall not be
delivered on the contract.
4.7.3 Noncompliance. If a sample unit fails to pass group B inspection, the manufacturer shall notify the qualifying
activity and cognizant inspection activity of such failure and 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 and processes, and which are considered
subject to the same failure. Acceptance and shipment 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 inspections, or the inspection which the original sample failed), at the
option of the qualifying activity. Group A inspection may be reinstituted; however, final acceptance shall be withheld
until the group B inspection has shown that corrective action was successful.
TABLE VII. Periodic group B inspection.
Number of
Number of
Requirement
sample units
Test method
defectives
Inspection
paragraph
to be
paragraph
permitted
inspected
1/
Subgroup 1
12
0
Temperature coefficient limits 2/
Immersion
Subgroup 2
0
Humidity, steady state, low voltage
12
Subgroup 3
25
Life
See 4.7.1.2
1/ A sample unit having one or more defects shall be charged as a single defective.
2/ Need not be repeated if performed on same samples as group A inspection.
4.8 Methods of examination and test.
4.8.1 Visual and mechanical examination. Capacitors shall be examined to verify that the materials, design,
construction, physical dimensions, and workmanship are in accordance with the applicable requirements (see 3.1,
11
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business