MIL-R-93 Resistors, Fixed, Wire-Wound, Accurate, General Specification ForThis specification covers the general requirements for accurate, wire-wound, fixed resistors having a maximum resistance tolerance of 1 percent, with the winding protected against high humidity. The resistors are rated for continuous full load operation at any ambient temperature up to 125 Degrees C, and derated up to 145 Degrees C. They are not capable for application where alternating current ac characteristics are of critical importance. Performance characteristics are in accordance with table I.

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MIL-R-93F

4.6.2.2.2  Rejected lots.  In the event of one or more defects, the inspection lot is rejected.  The manufacturer may use one of the following options to rework the lot.

a.  Each production lot that was used to form the failed inspection lot shall be individually submitted to the solderability test as required in 4.7.5.  Production lots that pass the solderability test can be reworked only if submitted to the solder dip procedure in 4.6.2.2.2.b.

b.  The manufacturer submits the failed lot to a 100 percent solder dip using an approved solder dip process in accordance with the appendix A.  Following the solder dip the electrical measurements required in group A, subgroup 1 tests shall be repeated on 100 percent of the lot.  The percent defective allowable (PDA) for the electrical measurements, shall be the subgroup 1 tests.  Thirteen additional samples shall then be selected and subjected to the solderability test with zero defects allowed.  If the lot fails this solderability test, the lot shall be considered rejected and shall not be furnished against the requirements of this specification.

4.6.2.2.3  Disposition of samples.  The solderability test is considered a destructive test and samples submitted to the solderability test shall not be supplied on the contract.

4.6.3  Group B inspection.  Group B inspection shall consist of the tests specified in table X, in the order shown.  The inspection shall be performed on sample units which have been subjected to and passed group A inspection.

TABLE X.  Group B inspection.

4.6.3.1  Sampling plan.  Thirteen sample units per lot shall be subjected to group B inspection with no failures permitted.

4.6.3.2  Small quantity production.  If no more than 75 resistors of the same style or group of styles defined for lot formation (see 4.6.1.1) are produced during a continuous 3 month period, the entire 3 month production may be submitted as one lot.  In case of failure, the entire lot shall be rejected and all units involved shall be subjected to corrective action.

4.6.3.3  Disposition of sample units.  Sample units that have been subjected to group B inspection shall not be delivered on the contract or purchase order.

4.6.4  Inspection of preparation for delivery.  Sample package or packs and the inspection of the preservation, packing and marking for shipment and storage shall be in accordance with the requirements in section 5.

4.6.5  Alternate inspection.  For the purpose of retention of qualification and conformance inspection

(see 4.5 and 4.6) the test results on identical items covered by MIL-PRF-39005 may be used.

4.7  Methods of inspection.

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