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|  MIL-R-5757H
TABLE III. Group B inspection.
Inspection
Requirement
Test method
paragraph
paragraph
4.6.11
Vibration
3.13
4.6.22
Mixed loads 1/
3.24
4.6.7
Dielectric withstanding voltage 2/
3.9
4.6.6
Insulation resistance 2/
3.8
4.6.8
Electrical characteristics 2/
3.10
4.6.1
3.1, 3.27, 3.29
Visual inspection (external)
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.
4.6 Methods of inspection.
4.6.1. Visual and mechanical. Relays shall be examined to verify that the materials (see 3.3), interface
and construction (see 3.4), physical dimensions (required only where mechanical inspection is specified),
marking (see 3.27), and workmanship (see 3.29) are in accordance with the applicable requirements.
Inspection requirements apply only where indicated (see 3.28).
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