MIL-STD-690D
APPENDIX A
GUIDANCE FOR SPECIFICATION WRITERS
A.1. SCOPE
A.1.1 Scope. This appendix provides an outline and description of requirements which are to be included in ER specifications. Their use will insure uniform requirements and procedures in all ER specifications. This appendix is a mandatory part of the standard. The information contained herein is intended for compliance.
A.2. APPLICABLE DOCUMENTS.
A.2.1 General. The documents listed in this section are specified in this appendix of this standard. This section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in appendix of this standard, whether or not they are listed.
A.2..2 Government documents.
A.2.2.1. 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 cited in the solicitation or contract.
DEPARTMENT OF DEFENSE HANDBOOKS
MIL-HDBK-217 - Reliability Prediction of Electronic Equipment.
(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch/ or https://assist.daps.dla.mil or from the Standardization Documents Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)
A.2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, 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. QUALIFICATION
A.3.1 Qualification at the initial FR level. Qualification shall be granted at the FR level representing the state-of- the-art. Unless valid data from current production substantiates other FR levels, qualification shall be granted at the "M" (1.0%) level. Qualification at the "M" (1.0%) level shall be based on results of qualification FR tests on a single sample size. A sampling plan in which the maximum number of failures permitted is greater than zero shall be used. In those ER specifications in which the initial qualification ER test is shorter in time then the extended ER test, all units subject to the qualification FR test shall be maintained on test for the time specified for the extended FR test. It is preferred that qualification be granted at initial failure rate through testing of a specified sample size and that qualification to lower failure rate levels be accomplished by accumulation of data from successive inspection lots. In this manner the failure rate will be more representative of production capability and history.
A.3.2 Extension of qualification to FR levels. Extension of qualification to lower FR level shall be accomplished by accumulating data from FR tests performed on sample selected from successive inspection lots. Qualification at lower failure rates is thus based upon data taken over a long period of production and not a single sample produced at one time. Extension of qualification is granted at the same confidence level (60 percent or 90 percent) as was used for the initial FR qualification.
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