Helicopter maintenance is currently based on aircraft flight hours. Each component's retirement time is derived using the Prime Contractors / Original Equipment Manufacturer's (OEM's) safe life methodology which typically includes fatigue testing of production components to determine a working S/N curve, measurements of maximum loads from flight load surveys, and construction of a composite usage spectrum from pilot surveys. Efforts are being made under the Condition Based Maintenance (CBM) program to implement a usage monitoring system, and evaluate the actual aircraft usage based on the time spent in specific maneuvers or missions. Goals of the usage monitoring program are to understand actual aircraft usage spectrums and apply this knowledge to improve safety, decrease component maintenance cost, and increase availability. This paper outlines a recommended Condition Based Maintenance (CBM) approach to helicopter fleet management. The different stages of the approach to CBM discussed in the following sections rely upon the Rotorcraft Structural Integrity Plan (RSIP) along with Usage Monitoring Systems that are based on flight recorder data. The RSIP establishes the structural performance, design development, and verification for rotorcraft structural components. A term that is used frequently throughout this report is fleet management. Fleet management refers to an approach to safety and preventative maintenance that, as with CBM, utilizes the individual aircraft's usage information to ultimately determine the level of damage accrued by critical structural components during routine operational usage. This can only be achieved when both the frequency and severity of the load can be determined from the aircraft's usage information. This paper also introduces concepts for the development of the actual operational Usage Spectrum from the flight recorder data. Issues associated with establishing reliability, mission spectrums and usage spectrums are discussed as a first step in implementing solutions.


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    Titel :

    A condition based maintenance approach to fleet management


    Beteiligte:


    Erscheinungsdatum :

    2008


    Format / Umfang :

    15 Seiten, 19 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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