Driven by increasing demands for increased safety and reduced operational costs, advanced Health and Usage Monitoring System (HUMS) technologies and applications are emerging/maturing that can be used to introduce structural Usage Based Maintenance (UBM) credits. FAA Advisory Circular AC-29-2C, Section MG 15 addresses airworthiness approval of rotorcraft HUMS and HUMS-based maintenance credits. The AC provides general guidance for achieving airworthiness approval for installation, credit validation, and instructions for continued airworthiness. This paper describes an FAA funded R&D effort to assess and validate existing regime recognition algorithms and establish a viable end-to-end UBM process that would be compliant with the FAA AC and therefore certifiable. This is accomplished by two sets of tasks. First, a proposed end-to-end UBM process is shown to exploit the capability of currently available HUMS, while mitigating any deficiencies, to enable near-term benefit of regime recognition technology. Second, existing HUMS regime recognition algorithms are evaluated against both flight test and HUMS fleet data. A new technique is presented to post-process available HUMS output to make it compatible with the established dynamic component life assessment process and credit validation guidelines. The UBM process is demonstrated to be compliant to the FAA AC as one but not the only means of complying.
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