A Safety-Deviation is a Measure of the estimated-or-observed difference between a required Safety-Margin, and the estimated or actual System Attribute Level.

Alternative Names

Concept Number: *405
English Master: Safety-Deviation
Synonyms, Variations & Acronyms: none


“How safe?” or “How safe compared to plan?”



Figure *405: Diagram showing calculation of a Safety-Deviation for a performance Attribute. The Safety-Margin is relative to the target Level and the distance between the Baseline and the target. In this example, as the required Safety-Margin is 150%, it must be 50% beyond the target Level. The distance (x) is worked out from the distance between the target and the Baseline (2x).


[Safety-Deviation *405]: Metric.

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Created by system. Last Modification: Friday 08 of November, 2013 00:21:12 CET by Adore Shuko.

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