IAC Condition Based Maintenance (CBM)

Condition based maintenance (CBM) is an approach to maintenance where actions are preformed based on a part’s condition or trend in condition rather then on a fixed maintenance time schedule. The CBM goal is to extend a parts useful life and reduce unnecessary replacement and thus save cost.

As indicated in the figure shown, time schedule part replacement occurs at a fixed time. For the CBM approach, the part is replaced based on crossing the horizontal line “Condition of part if replaced with CBM”. The equivalent time of CBM part replacement can be read off where the CBM replacement line intersects the part’s condition curve. The equivalent CBM replacement time is necessarily longer then the time-based replacement time. However because of the variable and asymptotic nature of the part condition tail, as seen when comparing the red and blue curves, this time can vary considerably.

IAC’s developed unique approaches for condition based maintenance diagnostics that does not rely on a single technique, algorithm or sensor [download papers]. The integration of a variety of techniques always yields a more reliable and accurate solution. We are constantly developing new advanced techniques as well as adding those developed by others to improve our results. IAC has successfully used vibration related aircraft health condition indicators coupled with trending analysis to successfully perform CBM for US Army helicopters [download paper]. Visit the Case Studies to learn more of IAC’s CBM successes. Let us show you how our diagnostic architectures can work with your existing system to save both time and money.

Downloads:

Prognosis of Faults in Gas Turbine Engines, Proc 2000 IEEE Aerospace Conf

Rotor Smoothing and Vibration Monitoring of US Army Helicopters, Proc 2003 American Helicopter Society Conf

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