In a joint effort by the Federal Aviation Administration and Delta Air Lines, the detailed inspection, destructive evaluation, and extended fatigue testing of fuselage structure from a retired revenue-service passenger airplane was undertaken. Eleven large sections of fuselage representative of structure susceptible to widespread fatigue damage were removed from a retired Boeing 727-232 airplane near its design service goal of 60,000 flight cycles. This volume (volume 2 of a 5-volume report) documents the findings associated with the destructive evaluation and damage characterization of selected fuselage structural elements. The target structure of this evaluation was the crown lap joints, which was known to be susceptible to multiple-site damage. The main objective of this teardown was to characterize the state-of-damage in lap joints that had seen only in-service loads and conditions. The primary focus was the right-hand crown lap joint forward of the wing along stringer 4R between frame stations (FS) 460 and-FS 740, which had over 150 nondestructive inspection crack indications prior to the teardown. This report presents the findings from the destructive examination of over 200 fastener holes from this lap joint. Stereomicroscope documentation of over 400 cracks found in the lower skin of the lower row of fasteners of these lap joints and scanning electron microscope documentation and crack backtracking of 50 of these cracks is included. Additionally, this report also presents findings of the condition of the rivet installation and hole quality at these rivet holes.


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    Titel :

    Destructive Evaluation and Extended Fatigue Testing of Retired Transport Aircraft. Volume 2: Damage Characterization


    Beteiligte:
    R. Ramakrishnan (Autor:in) / D. Jury (Autor:in)

    Erscheinungsdatum :

    2007


    Format / Umfang :

    481 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch