MIL-PRF-29C
4.5 Retention of qualification. Every 12 months, the manufacturer shall verify the retention of qualification to the
qualifying activity. In addition, the manufacturer shall immediately notify the qualifying activity whenever the group B
inspection results indicate failures of the qualified product to meet the requirements of this specification. Verification
shall be based on meeting the following requirements:
a.
The manufacturer has not modified the design of the item.
b.
The specification requirements for the item have not been amended so far as to affect the character of the
item.
c.
Lot rejection for group A inspection does not exceed the group A sampling plan.
d.
The requirements for group B inspection are met.
When group B requirements were not met and the manufacturer has taken corrective action satisfactory to the
Government, group B inspection retesting shall be instituted.
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and group B
inspection.
4.6.2 Inspection lot. An inspection lot, as far as practicable, shall consist of all the resistors of the same style,
produced under essentially the same conditions, and offered for inspection at one time.
4.6.3 Group A inspection. Group A inspection shall consist of the inspection specified in table III, and shall be
made on the same set of sample units, in the order shown.
TABLE III. Group A inspection.
Requirement
Method
Number of
Number of
Test
paragraph
paragraph
samples
defects allowed
Visual and mechanical inspection
Body and mounting dimensions
Marking 1/
See 4.6.3.1
0
Concentricity and parallelism of ferrules
Workmanship
DC resistance
1/
Marking defects shall be charged only for illegible, incorrect, or incomplete marking.
4.6.3.1 Sampling plan. A sample of parts from each inspection lot shall be randomly selected in accordance with
table IV. If one or more defects are found, the lot shall be rescreened and defects removed. After screening and
removal of defects, a new sample of parts shall be randomly selected in accordance with table IV. If one or more
defects are found in the second sample, the lot shall be rejected and shall not be supplied to this specification.
Resistance values shall be representative, and where possible, in proportion to the resistors in the inspection lot.
4.6.4 Group B inspection. Group B inspection shall consist of the tests specified in table V, in order shown. They
shall be performed on sample units that have passed the group A inspection, unless the Government considers it
more practical to select a separate sample from the lot for group B inspection.
4.6.4.1 Sampling plan. Group B inspection shall be performed on an inspection lot basis. A sample of 13 parts
shall be randomly selected. If one or more defects are found, the lot shall be rescreened and defects removed. A
new sample of 13 parts shall be randomly selected. If one or more defects are found in this second sample, the lot
shall be rejected and shall not be supplied to this specification.
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