W-F-1814D
4.6.1.3.1 Sampling plan. A sample of parts shall be randomly selected in accordance with table III.. If one or more defects are found, the lot shall be rescreened and defects removed. After screening and removal of defects, a new sample of parts shall be randomly selected in accordance with table III. If one or more defects are found in the second sample, the lot shall be rejected and shall not be supplied to this specification.
4.6.1.3.2 Disposition of sample units. Sample units subjected to group B inspection shall not be delivered on the contract or purchase order.
4.6.2 Qualification verification inspection. Qualification verification inspection shall consist of group C. Except where the results of this inspection show noncompliance with the applicable requirement (see 4.6.2.1.4), delivery of products which have passed groups A and B shall not be delayed pending the results of this qualification.
4.6.2.1 Group C inspection. Group C inspection shall consist of the interrupting capacity rating test (see 3.10 and
4.7.6). Group C inspection shall be made on sample units selected from lots which have passed groups A and Binspections, unless the Government considers it more practical to select a sample from current production. A manufacturer's normal quality control and production tests may be used to fulfill group C inspection.
4.6.2.1.1 Sampling plan. Samples shall be selected at random. Fifteen each of the maximum and minimum
ratings shall be selected from those covered on a single specification sheet, 12 months after the date of notification of qualification and after each subsequent 12-month period.
4.6.2.1.2 Failures. If one or more sample units fail to pass group C inspection, the sample shall be considered to have failed.
4.6.2.1.3 Disposition of sample units. Sample units which have been subjected to group C inspection shall not be delivered on the contract or purchase order.
4.6.2.1.4 Noncompliance. If a sample fails to pass group C 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 are manufactured under 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 C inspection shall be repeated on additional sample units
(all tests and examinations, or the test which the original sample failed, at the option of the qualifying activity).
Groups A and 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 concerning the failure shall be furnished to the cognizant inspection activity and the qualifying activity.
4.7 Methods of examination and test.
4.7.1 Visual and mechanical examination. Fuses shall be examined to verify that the material, design and construction, physical dimensions, marking, and workmanship are in accordance with the applicable requirements (see 3.1 through 3.5.3, 3.14, and 3.15).
4.7.2 Terminal strength (see 3.6). Terminals shall be tested in accordance with method 211 of MIL-STD-202, test condition E. Torque shall be as specified (see 3.1).
4.7.3 Current carrying capacity (see 3.7). Fuses shall be subjected to an alternating current, of any convenient voltage, at the specified percentage of rated current (see 3.1). Each fuse shall be mounted in such a position that its major axis is horizontal. The current shall be maintained until the temperature has stabilized.
4.7.3.1 Classes G, J, R, and K fuses. It may be assumed that the temperature has stabilized when three successive temperature readings, taken at 5-minute intervals, indicate no increased rise above the temperature of the ambient air. The temperature of the fuse case, or body, and of the terminals shall be measured using a standard all-glass mercury thermometer. The thermometer shall be supported so that the angle of its stem and the vertical shall not exceed 60 degrees. Contact between the bulb and the fuse will be insured by completely covering the bulb with glazing putty. The test shall be conducted in still air with the ambient temperature within 18°C to 32°C (65°F to 90°F) provided the air temperature does not vary more than 5°C (9°F) during the test. When two or more fuses are tested in series, the fuseholders shall be located so that there will be a spacing of not less than 6 inches between any two
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