MIL-PRF-26H
APPENDIX A
PROCEDURE FOR QUALIFICATION APPROVAL
A.1. SCOPE
A.1.1 Scope. This appendix details the procedure for submission of samples for qualification testing and approval
of resistors covered by this specification. The procedure for extending qualification of the required sample to other
resistors covered by this specification is also outlined herein.
A.2. APPLICABLE DOCUMENTS
A.2.1 Government documents.
A.2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a
part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are
those cited in the solicitation or contract (see 6.2).
DEPARTMENT OF DEFENSE STANDARDS
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Established Reliability and High Reliability Qualified Products List (QPL)
Systems for Electrical, Electronic, and Fiber Optic Parts Specifications
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Leads for Electronic Component Parts.
(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch/ or
https://assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D,
Philadelphia, PA 19111-5094).
A.2.2 Order of precedence. In the event of a conflict between the text of this document and the references cited
herein (except for related specification sheets), the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained
A.3. SUBMISSION
A.3.1 Sample.
A.3.1.1 All characteristics. A sample consisting of 15 or 20 sample units, as applicable, each of the highest and
lowest or 10 ohms, whichever is higher, values within the resistance range for which qualification is sought, of coated
or enclosed resistors shall be submitted in accordance with A.4 and table A-I. The resistance tolerance for
characteristic V shall be ±5 percent, and for characteristic U, ±1 percent or the lowest for which qualification is
sought. If 1 (F) percent resistance tolerance is submitted and lower resistance tolerance qualification is also sought,
then 10 sample units each of the highest resistance value and lowest or 10 ohms, whichever is higher, in the lower
resistance tolerance for which approval is sought shall be submitted and subjected to the inspection of groups I and
III. If the same coating and materials are not used, a separate submission shall be furnished in each characteristic in
lieu of characteristic submission outlined in A.4. Two uncoated or unenclosed resistors (one of the highest value and
one of the lowest or 10 ohms, whichever is higher) shall be submitted in each style. If enclosures are used in lieu of
coatings, two enclosures shall also be furnished. All submitted samples shall be representative of the supplier's
normal production.
A.3.1.2 Critical value. If the lowest resistance value (see A.2.1.1) is below the critical value specified (see 3.1) and
the highest resistance value is above the critical value (see 3.1), then 50 sample units of the critical value shall also
be submitted and shall consist of 10 each for group II through group V.
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