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MIL-HDBK-338 15 OCTOBER 1984 FOREWORD 1. This Electronic Reliability Design Handbook is an updating and extensive revision of the Reliability Design Handbook, published in 1976 by the Reliability Analysis Center under contract with RADC. The Handbook contains the most up-to-date, practical, pertinent guidelines for use by design engineers, reliability engineers, and managers to design, produce, and deploy reliable and maintainable military electronic equipment/systems at minimum life cycle cost. 2. The basic principles of how to design for sustained performance (reliability) and for the rapid diagnosis and removal of faults (maintainability) have not changed. However, the significant advances made in the twin disciplines of reliability and maintainability (R/M) during the past five years, coupled with the growth of digital systems, the increased usage of complex microcircuits, the looming importance of software, and increased complexity in general, have spawned a large number of new techniques which have been incorporated into the Handbook. 3. The approach taken has been to emphasize the practical aspects of R/M design and management techniques and to concentrate on real world examples which would give the reader insight into how the techniques are applied. The intent was to provide sufficient theoretical and practical information to solve those reliability problems frequently encountered. Some readers may feel that the treatment of the theoretical and mathematical aspects of the subject is inadequate; however, because of the broad coverage of the handbook, some sacrifices had to be made. Furthermore, there are many excellent standard textbooks available (and referenced) which treat the theoretical and mathematical areas in great depth. In addition, through a comprehensive list of reference material, the reader will be able to explore, for himself, aspects of the techniques required by those special problems which inevitably appear. 4. This handbook describes a comprehensive methodology covering all aspects of electronic system reliability design engineering and cost analysis as they relate to the design, acquisition, and deployment of DoD equipment/systems. Generally, the further into the handbook one reads, the more technical and detail the material becomes. The fundamental concepts are covered early in the handbook and the details regarding implementing these concepts are discussed primarily in the latter sections. This format, together with an objective for as much completeness as possible within each section, have resulted in some concepts being repeated or discussed in more than one place in the handbook. This should help facilitate the use of this handbook for studying certain topics without extensively referring to previous materi al. 5. In order to keep the Handbook as dynamic and flexible as possible, it has been published in looseleaf form. Each section, reflecting the current state-of-the-art for the subject matter covered, is a complete entity and can stand by itself. Thus, as technology advances occur for each subject, or new subjects become significant, the existing sections can be removed and revised and new sections added, as appro-pri ate. 6. This handbook is dedicated in memory of Mr. Joseph J. Naresky whose untiring effort and dedication pioneered the field of reliability and made this handbook a reality. His vast areas of experience, contributions to and knowledge of reliability theory and techniques have been captured through innumberable hours Mr. Naresky spent in preparing this text. Joe's participation and influence in the reliability community will be difficult to replace. i i i

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