Repairs based on adhesively bonded fibre composite patches or reinforcements are standard procedure for repairing mechanical damage in thin-skinned graphite/epoxy and are becoming widely accepted for repairing cracks, corrosion and other defects in aluminium alloy airframe structure. However, bonded composite repairs although often more cost effective and efficient than mechanically fastened patch repairs, and thus a promising technology for extending the life of ageing aircraft, are generally limited to non-primary structure and to non-critical damage in primary structure. Perhaps the major obstacle to the application of bonded composite repairs to critical damage in primary structure is the cost of airworthiness certification. This paper discusses the critical issues in the certification in bonded repairs to primary structure and suggests a generic approach to minimise costs. Two case histories are described as examples: one a boron/epoxy repair to an F111 aluminium alloy wing skin the other a demonstrator scarf repair to a F/A-18 graphite/epoxy stabilator. Finally, the 'Smart-Patch' concept is discussed and an early attempt for using this approach to monitor in-service structural integrity of a critical boron/epoxy reinforcement of the F111 wing pivot fitting is described.


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    Titel :

    On the certification of bonded composite repairs to primary aircraft structure


    Weitere Titelangaben:

    Über die Zertifizierung von Instandsetzungen geklebter Verbundstoffe an der tragenden Flugzeugkonstruktion


    Beteiligte:
    Baker, A. (Autor:in)


    Erscheinungsdatum :

    1997


    Format / Umfang :

    24 Seiten, 7 Bilder, 7 Tabellen, 34 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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    Baker, Alan / Gunnion, Andrew J. / Wang, John | Tema Archiv | 2015


    Issues in the Certification of Bonded Composite Patch Repairs for Cracked Metallic Aircraft Structures

    Baker, A. / International Committee on Aeronautical Fatigue | British Library Conference Proceedings | 1999


    Micrographic studies on adhesively bonded scarf repairs to thick composite aircraft structure

    Whittingham, B. / Baker, A.A. / Harman, A. et al. | Tema Archiv | 2009


    Towards a Certification Methodology for Adhesively Bonded Structures and Repairs

    Davis, M. / International Committee on Aeronautical Fatigue | British Library Conference Proceedings | 1999


    Advances in the Bondline Control Technology for the Certification of Adhesively Bonded Composite Repairs

    Heilmann, Lennert / Wierach, Peter / Wiedemann, Martin | Deutsches Zentrum für Luft- und Raumfahrt (DLR) | 2019

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