RAM Commander may also calculate the "Lambda Equivalent" parameter according to the EN 50129 standard (CENELEC) requirements - Use the "Equivalent Lambda" report from the "Reports" menu of FTA module.

 

Lambda-equivalent of the system S is an indicator of the ability of the system to fail. It is evaluated using the following equation:

 

where: w (e) is unconditional failure rate of the BE e,

MIF is Marginal importance factor - the rate at which the TOP unavailability S increases when the unavailability of component e increases,