Maintenance decision making tool reaching a compromise between maintainability and reliability performances

An original maintenance decision making tool based on Bruss theorem has previously been investigated by the authors to select the optimal last production stoppage convenient to operate a maintenance action on a component according to its conditions of degradation. This stoppage is optimal with respect to the combination of antagonistic criteria such as maintainability and reliability. The approach is also opportunistic as maintenance is developed during production stoppages already planned. However the optimality with respect to the separate criteria alone has not been taken into account to find this global optimal stoppage. The present work aims at providing, for this tool, a way to eliminate stoppages a priori unacceptable for one criterion, so that this stoppage cannot be proposed as the final global solution. This will be done with the help of a maintenance expert. Case studies are presented and commented. Two criteria have been considered, namely maintainability and reliability. These criteria will also be used for emphasis on the difference between local optimal decisions and a global optimal decision.