Keywords: condition-based maintenance, multi-component systems, joint maintenance, economic dependency.

In this paper, maintenance policies for advanced capital goods where condition monitoring data are available for a subset of all critical components, are studied. Users of such goods may suffer from high costs related to downtime; and those costs can be reduced by condition-based maintenance. At the same time, one is faced with high joint set-up whenever maintenance is executed for one or multiple components. This requires that maintenance actions for all components of a system are coordinated, where one has to deal explicitly with the fact that for some components a condition-based policy is applied while for other components an age-based policy or failure based policy is applied (e.g. because no condition data are available for them). The objective of the research, described in this paper, is to develop maintenance policies for multi-component systems, under the given mixture of different maintenance policies for individual components. An efficient heuristic that can be applied for real-life systems with large numbers of components is described.

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