MIL-R-5757J
4.5.2 Periodic inspections. Periodic inspections shall consist of group B and group C. Except where the results of these inspections show noncompliance with the applicable requirements, delivery of products which have passed group A shall not be delayed pending the results of these periodic inspections.
4.5.2.1 Group B inspection. Group B inspection shall consist of the tests specified in table III and shall be made on sample units which have been subjected to and have passed the group A inspection.
4.5.2.1.1 Sampling plan. Four sample units shall be selected every three months from the inspection lots which have passed group A inspection. No failures are allowed.
4.5.2.1.2 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be delivered on the contract or order.
TABLE III. Group B inspection.
Inspection |
Requirement paragraph |
Test method paragraph |
Vibration Mixed loads 1/ Dielectric withstanding voltage 2/ Insulation resistance 2/ Electrical characteristics 2/ Visual inspection (external) |
3.13 3.24 3.9 3.8 3.10 3.1, 3.27, 3.29 |
4.6.11 4.6.22 4.6.7 4.6.6 4.6.8 4.6.1 |
1/ When intermediate current is not applicable, low level testing, as specified, shall be performed in accordance with the life test (see 3.22), using procedure 4.6.20.4 only; otherwise, use procedure 4.6.20.1 only for maximum rated resistive current.
2/ Testing sequence is optional for insulation resistance, dielectric withstanding voltage, and coil resistance (or coil current) only.
4.5.2.2 Group C inspection. Group C inspection shall consist of the inspections specified in table I (qualification table) in the order shown. Group C inspection shall be made on sample units selected from inspection lots which have passed the group A inspection.
4.5.2.2.1 Sampling plan. Every 36 months, the number of sample units specified in 4.3.1.1 shall be subjected to the inspections of table I, performed in the order shown. The number of failures allowed shall be as specified in table I.
4.5.2.2.2 Disposition of sample units. Sample units which have been subjected to group C inspection shall not be delivered on the contract or order.
4.5.2.3 Noncompliance. If any sample fails group B, or if the number of group C failures exceeds the number of failures allowed in table I, the manufacturer shall notify the qualifying activity and the cognizant inspection activity of such failure, and shall 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 with essentially the same materials and processes, and which are considered to be subject to the same failure. Acceptance and shipment of the product shall be discontinued until corrective action acceptable to the qualifying activity has been taken. After the corrective action has been taken, group C inspection shall be repeated on additional sample units (all inspections or the specific inspection which the original sample failed, at the option of the qualifying activity). Group A and group B inspections
may be reinstituted; however, final acceptance and shipment shall be withheld until the group C inspection has shown that the corrective action was successful. In the event of failure after reinspection, information explaining the failure
shall be furnished to the cognizant inspection activity and the qualifying activity.
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