MIL-PRF-39015E
4.7.1 Sampling plan. If more than 1,000 resistors of any style or style grouping are produced over the
maintenance period, the group B tests shall be performed as specified. If the production rate is less than
1,000 resistors for any style or style grouping over the maintenance period then the monthly, quarterly, or
semi-annual group B inspection may be postponed until at least 1,000 resistors of that style or style
grouping are produced (except for the monthly life test). In any case, the monthly tests shall be
performed at least once every 3 months. The quarterly tests shall be performed at least every 6 months
and the semi-annual tests shall be performed at least once every year. This requirement is waived if the
manufacturer has obtained a reduced inspection status through the qualifying activity.
All qualified styles may be grouped together in a single sample. This can be accomplished by
proportion based on manufacturing percentages by style, equally divided by style, or by establishing an
alternating style sequence. In order to incorporate a style sampling grouping, a written description must
be presented and approved by the qualifying activity. This plan must assure that the grouping only
combines styles of the same basic design, encapsulation material, and the same element type.
4.7.2 Quarterly.
4.7.2.1 Subgroup 1. Samples shall be accumulated from each inspection lot and placed on extended
life (see 4.8.25) for the full 10,000 hour life test. A sufficient number of samples shall be selected from
each lot by the manufacturer so that the maintenance of FR requirements are complied with, within the
specified maintenance period. In any event, a minimum of 5 samples shall be selected from each lot. As
far as practicable, the manufacturer shall select the resistance values so that all resistance decades
produced during the maintenance period are represented.
4.7.2.2 Subgroup 2 and subgroup 3. Quarterly, the specified number of sample units shall be
subjected to the tests specified in table IX.
4.7.3 Semiannual. Sample units and tests shall be as specified in table IX.
4.7.4 Disposition of sample units. Sample units which have been subjected to group B inspection shall
not be delivered on the contract or purchase order.
4.7.5 Noncompliance. If a sample fails to pass group B inspection, the manufacturer shall immediately
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 materials and processes and which are
considered subject to the same failure. For ER level, acceptance and shipment of the product shall be
discontinued until corrective action; acceptable to the qualifying activity has been taken. For C level, stop
shipment may not be necessary depending on the nature of the failure. After the corrective action has
been taken, group B inspection shall be repeated on additional sample units (all inspections, 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.
4.8 Methods of inspection.
4.8.1 Visual and mechanical inspection. Resistors shall be examined to verify that the materials,
design, construction, physical dimensions, marking, and workmanship are in accordance with the
applicable requirements (see 3.1, 3.4 to 3.4.2 inclusive, and 3.5 to 3.5.8 inclusive, and 3.32 to 3.33
inclusive).
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