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Abstract
While Health and Usage Monitoring Systems (HUMS) continue to advance and provide increasingly refined Condition Based Maintenance (CBM) solutions (exemplified at References 1 through 6), HUMS-equipped aircraft procured before the maturation of these systems require consideration of novel approaches to maximize the benefit of available data. Presented as a case study, the Canadian Search & Rescue CH149 Cormorant helicopter, a variant of the Finmeccanica (AgustaWestland) EH-101, entered service for Canada in 2002 equipped with a HUMS. The following paper will present how HUMS data have been employed to support the CH149 fleet of 14 aircraft; specifically, how such data are used to (i) support fleet and individual aircraft usage monitoring, and (ii) identify adverse trends for additional detailed investigation. It is herein demonstrated that heavily processed data from a legacy HUMS, even without defined thresholds, may have value with proper consideration and validation.

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