DORMANT OPERATING AND STORAGE EFFECTS ON ELECTRONIC EQUIPMENT AND PART RELIABILITY
Abstract
A 22 month program has been conducted to determine the effects of dormant operating and storage conditions on electronic equipment and parts. An extensive data search has been made covering major aerospace industries, research institutes, and government agencies. Over 760 billion part-hours of dormant operating and storage information on various part classes have been collected from all sources. Of these data, approximately 76 billion part-hours are on military standard parts, 52 billion on selected military standard parts, 630 billion on high reliability parts, and 3 billion on microcircuits. These data have been processed and are presented in the form of storage or dormant operating failure rates by part type and subtypes for the various part classes. Failure rate charts have been constructed and partially validated for military standard and for high reliability part classes. Environmental effects of dormant operation and storage on the various part classes are discussed together with some factors relating them to each other whether in the dormant operating or storage mode. Test data from storage programs have been statistically analyzed to determine performance drift trends with nonoperating time. Part failures that occurred during storage were dissected in the laboratory and failure mechanisms isolated. Case histories of these analyses and a list of mechanisms found after nonoperating time periods are included in the appendices of this report. Design notes, prepared for various high-usage parts, detail the preferred application, procurement, vendor manufacturing, and user assembly practices. These practices are shown to result in maximum reliability during nonoperating time periods.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1967
- Accession Number
- AD0821988
Entities
People
- D. F. Cottrell
- E. W. Kimball
- T. R. Gagnier