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PERFORMANCE, reliability, and operational flexibility are critical requirements of complex mechanical systems,such as aircraft propulsion, and these requirements may vary with different mission perspectives during the service life. In spite of meticulous engineering design, complex systems do eventually degrade and often fail to yield the anticipated performance during the later phases of their operational life. Recently, much attention has been devoted to condition-based maintenance using the online information of sensor-based observables. For example, life extending
Tolani et al. (2006) studied this question.