onditional probability per unit of time that the restoration of a failed item ends between t and t+dt,
provided that it was not finished over [0, t]
Note 1 to entry: The following relationship holds when the restoration rate is constant: MTTRes = 1/μ.
Note 2 to entry: The “restoration” rate is in relationship with the restoration time. Similarly the “repairing” rate
can be defined in relationship with the “overall repairing” time and the “active repair” rate in relationship with
the “active repair” time.
Note 3 to entry: The restoration rate has the same mathematical properties for the restoration as the failure rate
for the failures.
Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards