Feilmodus

Feilmodus is a Norwegian term used primarily in reliability engineering and safety analysis to denote a specific failure mode, i.e., a discrete way in which a system can fail or operate incorrectly. The term is used in methods such as Failure Modes and Effects Analysis (FMEA) and fault-tree analysis to categorize and analyze how components or systems can depart from their intended function. By identifying feilmodus, engineers assess potential consequences, underlying causes, existing controls, and detection methods, enabling prioritization of mitigation actions.

Typical use: In a mechanical system, a feilmodus might be "bearing wear leading to excessive play" or "switch contact corrosion causing intermittent loss of signal." In software, it could be "input validation bypass enabling unauthorized access," though in software contexts the term failure mode is more common.

Etymology: from feil (fault) and modus (mode); cognate with German Fehlmodus. It is mainly used in Norwegian-language technical literature and translated standards and is generally understood in Nordic reliability communities.

Limitations: The term describes the mode, not the probability of occurrence; risk assessment combines likelihood and severity to prioritize actions.

See also: Failure Modes and Effects Analysis, reliability engineering, fault tree analysis.