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Latent-failure risk estimates for computer controlIt is shown that critical computer controls employing unmonitored safety circuits are unsafe. Analysis supporting this result leads to two additional, important conclusions: (1) annual maintenance checks of safety circuit function do not, as widely believed, eliminate latent failure risk; (2) safety risk remains even if multiple, series-connected protection circuits are employed. Finally, it is shown analytically that latent failure risk is eliminated when continuous monitoring is employed.
Document ID
19920059463
Document Type
Conference Paper
Authors
Dunn, William R. (Southern Colorado, University; NASA, Ames Research Center Moffett Field, CA, United States)
Folsom, Rolfe A. (NASA Ames Research Center Moffett Field, CA, United States)
Green, Owen R. (Boeing Aerospace Operations; NASA, Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
QUALITY ASSURANCE AND RELIABILITY
Meeting Information
Annual Reliability and Maintainability Symposium(Orlando, FL)
Funding Number(s)
CONTRACT_GRANT: NCC2-609
CONTRACT_GRANT: NCC2-276
CONTRACT_GRANT: NAS2-13173
Distribution Limits
Public
Copyright
Other