W-F-18140
4.5.2 Retention of qualification. To retain qualification, the contractor shall provide verification to the qualifying activity for the following items every 12 months:
a. Verification that the conformance inspections have been performed on inspection lots supplied to the requirements of this specification. If test results indicate nonconformance with specification requirements, and corrective action acceptable to the qualifying activity has not been taken, action may be taken to remove the failing product from the QPL.
b. Those contractors that used the UL Listed mark to obtain qualification shall submit certification that the qualified fuses retain the UL Listed Mark, at 12-month intervals, to the qualifying activity. The letter of certification shall include the UL file number, the Government part number, and the manufacturer's part number for each fuse rating that is qualified. The manufacturer shall also certify that they will notify the qualifying activity of any problem which threatens loss of the UL Listed Mark within 30 days after recognition of the problem. The initial reporting date shall be established by the qualifying activity. Failure to submit the certification within 30 days after the end of each 12-month period may result in loss of qualification for the product.
In the event that no production has occurred in this period, the contractor shall still verify to the qualifying activity that the capacity to manufacture and test QPL fuses still exists and that the contractor wants to remain on the QPL.
4.6 Quality conformance inspection. Quality conformance inspection shall consist of groups A, B, and C inspections as specified herein, for fuses which qualified in accordance with 4.5a. For fuses which qualified in accordance with
4.5b. the UL Listed Mark shall be evidence of compliance.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A and B
inspections.
4.6.1.1 Inspection lot. An inspection lot shall consist of all fuses of the same class and current rating produced under essentially the same conditions, and offered for inspection at one time.
4.6.1.2 Group A inspection. Group A inspection shall consist of the inspections specified in table II.
TABLE II. Group A inspection.
Inspection |
Requirement paragraph |
Method paragraph |
Visual and mechanical examination - - - - - - - - - - - - - - - - - Terminal strength - - - - - - - - - - - - - - - |
3.1 through 3.5.3, 3.14, and 3.15 3.6 |
4.7.1 4.7.2 |
4.6.1.2.1 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.
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