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Feasibility Study of a Rotocraft Health and Usage Monitoring System (HUMS): Results of Operator's Evaluation (MS Word file)
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1996-02-01
[PDF-579.31 KB]
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NTL Classification:NTL-AVIATION-AVIATION;NTL-AVIATION-Aviation Safety/Airworthiness;
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Abstract:The objective of this study was to evaluate the feasibility of a state of the
art health and usage monitoring system (HUMS) to provide monitoring of critical
mechanical systems on the helicopter, including motors, drive train, engines
and life limited components. The implementation of HUMS and cost integration with current maintenance procedures was assessed from the operator's viewpoint in order to achieve expected benefits from these systems, such as enhanced safety, reduced maintenance cost and increased availability. An operational HUMS was used as a basis for this study that was installed and operated under an independent flight trial program. The HUMS equipment and software were commercially available. Based on the results of the feasibility study, the HUMS used in the flight trial program generally demonstrated a high level of reliability in monitoring the rotor system, engines, drive train and life limited components. The system acted as a sentinel to warn of impending failures. Examples of potential payback to the operator with HUMS were identified, including reduced insurance cost through enhanced safety, lower operating costs derived from maintenance credits, increased aircraft availability and improved operating efficiency. The interfacing of HUMS with current operational procedures, was assessed to require only minimal revisions to the operator's maintenance manuals. Finally the success in realizing the potential benefits from HUMS technology was found to depend on the operator, helicopter manufacturer, regulator (FAA), and HUMS supplier working together. NOTE: This document as linked in this record is a Word document, 7219k, 54p. NOTE: A companion activity was also accomplished as a second phase of this project and is contained in NASA CR198447 (ARL CR 290; DOT/FAA/AR 95/9). In that report two techniques are used to assess data gathered under an independent flight study as it related to rotorcraft health and usage monitoring.
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