MIL-PRF-23648F
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 indicates 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 are 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 tests; however, group B tests shall not delay delivery.
4.6.1.1 Inspection lot. An inspection lot shall consist of all thermistor of the same style, resistance
ratio, characteristic, lead type, and protective enclosure or coating under essentially the same conditions
and offered for inspection during a period of 1 month.
4.6.2 Group A inspection. Group A inspection shall consist of the inspections specified in table V, and
shall be made on the set of sample units, in the order shown. Thermistors subjected to subgroup II shall
not be supplied against purchase order.
4.6.2.1 Subgroup 1. A sample of parts from each inspection lot shall be randomly selected in
accordance with table VI. If one or more defects are found, the lot shall be screened and defectives
removed. After screening and removal of defectives, a new sample of parts shall be randomly selected in
accordance with table VI. 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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