A Condition-Based Maintenance (CBM) strategy is presented, that combines condition monitoring of selected parts with scheduled inspections of the remaining parts. This strategy takes into account that it may not be possible or practical to monitor every failure mode within a system and to obtain a maintenance credit for each individual scheduled inspection task. An assessment of maintenance need is used to identify components for condition monitoring, and to determine an appropriate inspection schedule for notmonitored parts. Based on past experience with gearbox overhauls, maintenance-need based CBM development has a high potential, considering that of the multitude of failure modes that could affect a gearbox, only very few actually occur with any regularity. The assessment of maintenance need is based on an analysis of in-service fault findings. The analysis procedures require detailed information about observed faults, such as a severity measurement or a classification between "acceptable degradation" and "unacceptable degradation," that is presently not always systematically collected. A future requirement for comprehensive fault documentation can lead to additional work for the maintenance organization, however this can be considered as a price that must be paid in order to implement maintenance strategies that aim for optimal part usage. The degradation data also plays an important role, in combination with corresponding HUMS data, in the evaluation of the fault detection performance of the monitoring system. The degradation analysis methods presented here are arguably more suitable than conventional failure analysis techniques to assess the operational reliability of helicopter drive systems. Due to the high inherent reliability of modern aerospace components and comprehensive preventive maintenance practices, functional failures are very rarely observed in the field. When using the quantitative degradation analysis method presented in this paper, the probability of failure can be inferred from the wear distribution, even when no failures are observed. The proposed methodology enables the aircraft design organization to not only systematically develop a condition monitoring strategy based on maintenance need, but also to quantify the risk involved with a specific inspection frequency for a fault in terms of the associated maintenance need and probability of failure. Thereby the impact of a CBM strategy on the operational safety of critical systems, such as helicopter transmissions, can be assessed. The ability to quantitatively demonstrate to airworthiness authorities how operational safety is affected by implementing CBM can be of advantage in the maintenance credit application process.


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    Titel :

    Assessment of maintenance need for condition-based maintenance development


    Weitere Titelangaben:

    Bewertung der Wartungsbedürftigkeit für die zustandsbasierte Wartungsentwicklung


    Beteiligte:
    Wurzel, Georg (Autor:in) / Doleschel, Andreas (Autor:in) / Hoffmann, Falk (Autor:in) / Weigand, Michael (Autor:in)


    Erscheinungsdatum :

    2011


    Format / Umfang :

    8 Seiten, 11 Bilder, 13 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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