Windchill Risk and Reliability Desktop Help > Windchill FRACAS > FRACAS Calculations > FRACAS Calculation Equations > Reliability
Reliability
The equation for calculating reliability is:
Where:
λ
=
Failure rate in failures per hour or the inverse of MTBF.
t
=
Total mission time in hours.
When calculating reliability based on FRACAS data, constant failure rates are assumed for all items. On the FRACAS > FRACAS Calculations page in the Calculate window, you enter the mission time that you want to use to calculate FRACAS reliability results. The default is 0 hours. For more information, see FRACAS Calculations Page.