MIL-R-83516B
4.5.2 Periodic inspection. Periodic inspection shall consist of group B. Except where the results of these inspections show noncompliance with the applicable requirements (see 4.5.2.2), delivery of products which have passed group A inspection 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 inspections specified in table II. Group B
inspection shall be made on sample units selected from inspection lots which have passed the group A inspection.
4.5.2.1.1 Sampling plan. Every 36 months, 13 sample units shall be subjected to the inspections of table II. The number of failures allowed shall be as specified in table II.
4.5.2.1.2 Failures. If the number of failures exceed the number allowed in table II, the sample shall be considered to have failed.
4.5.2.1.3 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be delivered on the contract or purchase order.
4.5.2.2 Noncompliance. If a sample fails to pass group B inspection, the manufacturer shall notify the qualifying activity and the cognizant inspection activity of such failure and 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 under essentially the same conditions, with essentially the same materials and processes, and which are considered 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 B inspection shall be repeated on additional sample units (all inspection, or the inspection which the original sample failed, at the option of the qualifying activity). Group A inspection may be reinstituted; however, final acceptance and shipment shall be withheld until the group B inspection has shown that the corrective action was successful. In the event of failure after reinspection, information concerning the failure shall be furnished to the cognizant inspection activity
and the qualifying activity.
4.6 Methods of inspection. When applicable, testing of relays with plug-in terminations shall be performed with the appropriate connector mated to the relay. When it is necessary to monitor contact operation during the
specified testing, the contact monitor used shall not load the respective contact in excess of 1/10 watt. A NE-2 neon lamp in series with a 100,000-ohm resistor, represents a suitable contact monitoring device.
4.6.1 Visual and mechanical examination.
4.6.1.1 Internal. Relays shall be examined to verify that the internal design and construction, physical dimensions, materials, and workmanship are in accordance with the applicable requirements (see 3.1, 3.3, 3.4, and
3.31).
4.6.1.2 External. Relays shall be examined to verify that the external design and construction, physical dimensions, materials, marking, and workmanship are in accordance with the applicable requirements (see 3.1, 3.3,
3.4, 3.30, and 3.31).
4.6.2 Thermal shock (see 3.5). Relays shall be tested in accordance with method 107 of MIL-STD-202. The following details and exceptions shall apply:
a. Special mounting: Relays shall be suspended in the test chamber by twine, or other nonheat-conducting material, in a plane parallel to the normal airflow. For group A testing, thermal shock may be performed with relays mounted in a suitable test rack to facilitate performance of electrical tests required during and after temperature cycling. Test leads may be used for mounting, however, they shall not provide a heat sink.
b. Test condition: B, except the high temperature shall be +105°C, and exposure time at temperature extreme during the fifth cycle shall be for 2 hours each (see 3.1).
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