ABSTRACT
In the gas turbine case there are large uncertainties about future performance due to a low amount of relevant data on the existing system and lack of knowledge of the ageing effects/phenomena involved. The traditional approach to maintenance optimisation is not considered adequate as the sole basis for supporting the decision. To solve the decision problem we suggest an alternative method based on a broad risk analysis and management approach. Of specific interest is the treatment and communication of uncertainty. The suggested approach allows for an overall and consistent description and treatment of all types of consequences and associated uncertainties. Qualitative analyses of uncertainty are provided giving useful insights beyond the assigned probabilities and expected values.
