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 Engineering
  Wikipedia▎ 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 Assessment
  Wikipedia▎ 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 Engineering
  APiS 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