The 'on condition' concept of aircraft engine maintenance has led to intensive analysis of the data recorded by engine health monitoring systems during steady-state operation of the engine. To date however the transient data acquired during takeoff or during in-flight transients have received far less attention. In this paper the results of an investigation of the feasibility of utilizing engine data acquired during takeoff to trend the performance of a modern turbofan engine (GE-F404) are presented. Factors influencing the repeatability of takeoff data such as throttle rate, variable geometry and instrumentation effects are discussed in detail. Using representative engine data from operational aircraft, various trending parameters are evaluated using a data capture window developed to minimize the scatter of nominal engine performance. A statistical tool employed to identify performance shifts is described, and when applied to a recently-repaired engine successfully detected a shift in its takeoff performance. It is concluded that trending of transient performance data is a viable means of detecting certain engine faults and recommendations are made concerning the implementation of such a program for the F404 engine.


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    Title :

    Transient performance trending for a turbofan engine


    Additional title:

    Uebergangsleistung fuer einen Turbofan-Motor


    Contributors:
    Henry, J.R. (author) / Moffatt, W.C. (author)

    Published in:

    ASME-Papers ; Jun ; 1-11


    Publication date :

    1988


    Size :

    11 Seiten, 10 Bilder, 3 Tabellen, 7 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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