long-term might harm the stakeholders’ confidence in the policy (since we will be conducting unjustified maintenance actions more frequently). Finally, a surprising finding was that none of the (original) scenarios resulted in a selected decision of “Do nothing”. A satisfactory and verified explanation for this result (by extending the sensitivity analysis) is that minimal and major repair costs are smaller than reactive maintenance and downtime costs, which in general make it less expensive to conduct preventive maintenance in any state. Then, we tested situations where: reactive costs are smaller than preventive costs, and minimal repair costs are greater than major repair costs, both leading to “Do nothing” decision results. Another possible explanation for this situation, though not tested in this chapter, is that we are not considering the loss of production due to preventive maintenance activities performed, which also provides an advantage to keep repair costs small. On account of these facts, it is understandable that preferred actions on any state are mostly between “Minimal repair” and “Major repair”.
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