Area Dependability / Reliability related concepts: measures IEV ref 192-05-07 Symbol $\overline{\lambda }\left({t}_{1},\text{\hspace{0.17em}}{t}_{2}\right)$ en mean failure rateaverage failure rate average value of the instantaneous failure rate over a given time interval (t1, t2) $\overline{\lambda }\left({t}_{1},\text{\hspace{0.17em}}{t}_{2}\right)=\frac{1}{{t}_{2}-{t}_{1}}{\int }_{\text{\hspace{0.17em}}\text{\hspace{0.17em}}{t}_{1}}^{\text{\hspace{0.17em}}\text{\hspace{0.17em}}{t}_{2}}\lambda \left(t\right)\text{\hspace{0.17em}}\text{d}t$ fr taux moyen de défaillance, m moyenne du taux instantané de défaillance sur un intervalle de temps donné (t1, t2) $\overline{\lambda }\left({t}_{1},\text{\hspace{0.17em}}{t}_{2}\right)=\frac{1}{{t}_{2}-{t}_{1}}{\int }_{\text{\hspace{0.17em}}\text{\hspace{0.17em}}{t}_{1}}^{\text{\hspace{0.17em}}\text{\hspace{0.17em}}{t}_{2}}\lambda \left(t\right)\text{\hspace{0.17em}}\text{d}t$ ar معدل الانهيارمعدل متوسط الانهيار de mittlere Ausfallrate, f es tasa media de fallo ko 평균 고장율평균 고장율 ja 平均故障率 pl intensywność uszkodzeń średnia, f pt taxa média de falhas zh 平均失效率