MIL-PRF-19E
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. Qualification inspection (see 4.4)
b. Conformance inspection (see 4.6)
4.2 Test equipment and inspection facilities. The manufacturer shall establish and maintain a calibration system in
accordance with NCSL Z540-1, ISO-10012-1, or equivalent system as approved by the qualifying activity.
4.3 Inspection conditions and precautions.
4.3.1 Inspection conditions. Unless otherwise specified herein, all inspections shall be in accordance with the test
4.3.2 Precautions. Adequate precautions shall be taken during inspection to prevent condensation of moisture on
resistors. Precautions shall also be taken to prevent damage by heat when soldering resistor leads to terminals.
4.4 Qualification. Qualification inspection shall be performed at a laboratory acceptable to the Government
(see 6.3) on sample units produced with equipment and procedures normally used in production.
4.4.1 Sample size. The number of sample units comprising a sample of resistors to be subjected for qualification
inspection shall be as specified in the appendix to this specification. The sample shall be taken from a production run
and shall be produced with equipment and procedures normally used in production.
4.4.2 Test routine. Sample units shall be subjected to the qualification inspection specified in table VII or table VIII, in
the order shown. All sample units shall be subjected to the inspection of group I. The specimens shall then be divided
into groups in accordance with table A-II or table A-III as applicable, and subjected to the inspection for their particular
group. For combined-type submission, the inspection routine shall be in accordance with the appendix to this
specification.
4.4.3 Defective. Defectives in excess of those allowed in table VII or table VIII will be cause for refusal to grant
qualification.
4.5 Retention of qualification. Every 6 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 failure of the qualified product to meet the requirements of the 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.
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