Aliases
Disambiguation
Scientific/engineering term for probability of system failure, NOT a person, organization, or event. Used in reliability analysis, risk assessment, and aerospace/military systems engineering.
Stats
Concept
The mathematical probability (0–1 scale) that a system will fail to perform its intended function within a specified time period or operating environment; the complement of reliability.
A probabilidade matemática (escala 0–1) de que um sistema falhará em executar sua função pretendida em um período de tempo ou ambiente operacional especificado; o complemento da confiabilidade.
Enrichment
- Reliability EngineeringWikipedia▎ high· 2026-05-14
- Failure probability is the complement of reliability: Pf = 1 - R
- Calculated using historical data analysis, physics-of-failure methods, reliability testing, and reliability modeling
- Fundamental equation: R(t) = Pr{T > t} where reliability at time t equals probability system survives beyond that point
- Probabilistic Risk AssessmentWikipedia▎ high· 2026-05-14
- PRA is systematic methodology to evaluate risks in complex engineered systems
- Combines magnitude (consequence severity) and likelihood (probability) in risk calculation
- Uses fault tree analysis, event tree analysis, and human reliability analysis
- Basics of FMEA in Aerospace EngineeringAPiS North America▎ high· 2026-05-14
- FMEA originated in 1940s US military to improve equipment reliability
- Mil-Std-1629 published 1974 by Department of Defense; revised 1980 as Mil-Std-1629A
- Standard aerospace methodology for identifying failure modes and calculating failure probability
Failure Probability
Description (EN)
Stub generated by entity dedup. Will be enriched in Phase 6.
Descrição (PT-BR)
Stub gerado pela deduplicação de entidades. Será enriquecido na Fase 6.
<!-- enrichment:start -->Enrichment (EN)
Disambiguation: Scientific/engineering term for probability of system failure, NOT a person, organization, or event. Used in reliability analysis, risk assessment, and aerospace/military systems engineering.
Failure probability is a quantitative measure in reliability engineering and probabilistic risk assessment (PRA) that expresses the likelihood a system will not perform its intended function within a specified time period or operating environment. Mathematically complementary to reliability (R + U = 1), it is calculated using historical failure data, physics-of-failure analysis, and statistical modeling. The concept originated in US military doctrine (Mil-Std-1629, 1974) and is foundational to failure modes and effects analysis (FMEA/FMECA). Applications span aerospace, nuclear energy, chemical processing, and defense systems, where it is combined with consequence severity to quantify overall risk. In aerospace and military contexts, failure probability informs system design, redundancy decisions, and safety certification standards.
Enriquecimento (PT-BR)
Desambiguação: Scientific/engineering term for probability of system failure, NOT a person, organization, or event. Used in reliability analysis, risk assessment, and aerospace/military systems engineering.
Probabilidade de falha é uma medida quantitativa em engenharia de confiabilidade e avaliação de risco probabilístico (PRA) que expressa a probabilidade de um sistema não executar sua função pretendida em um período de tempo ou ambiente operacional especificado. Matematicamente complementar à confiabilidade (R + U = 1), é calculada usando dados históricos de falhas, análise da física de falhas e modelagem estatística. O conceito originou-se na doutrina militar dos EUA (Mil-Std-1629, 1974) e é fundamental para análise de modos de falha e seus efeitos (FMEA/FMECA). As aplicações abrangem aeroespacial, energia nuclear, processamento químico e sistemas de defesa, onde é combinada com severidade de consequências para quantificar o risco geral. Em contextos aeroespaciais e militares, a probabilidade de falha informa decisões de design de sistema, decisões de redundância e padrões de certificação de segurança.
External Sources
- Reliability Engineering · Wikipedia · reliability:
high— Failure probability is the complement of reliability: Pf = 1 - R; Calculated using historical data analysis, physics-of-failure methods, reliability testing, and reliability modeling; Fundamental equation: R(t) = Pr{T > t} where reliability at time t equals probability system survives beyond that point - Probabilistic Risk Assessment · Wikipedia · reliability:
high— PRA is systematic methodology to evaluate risks in complex engineered systems; Combines magnitude (consequence severity) and likelihood (probability) in risk calculation; Uses fault tree analysis, event tree analysis, and human reliability analysis - Basics of FMEA in Aerospace Engineering · APiS North America · reliability:
high— FMEA originated in 1940s US military to improve equipment reliability; Mil-Std-1629 published 1974 by Department of Defense; revised 1980 as Mil-Std-1629A; Standard aerospace methodology for identifying failure modes and calculating failure probability