An ultrasonic inspection method was developed at FAA's Airworthiness Assurance NDI Validation Center (AANC) to easily and rapidly detect hidden fatigue cracks in the copilot vertical windshield post on USCG (Coast Guard) HU-25 'Guardian' aircraft. The inspection procedure locates hidden cracks as small as 3.2 mm emanating from internal fastener holes and determines their length. A test procedure was developed and a baseline assessment of the USCG fleet conducted. Inspection results on 41 aircraft revealed good correlation with results made during subsequent structural disassembly and visual inspection of selected aircraft.


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    Title :

    Crack detection on HU-25 Guardian aircraft


    Contributors:
    D. G. Moore (author) / C. R. Jones (author) / J. E. Mihelic (author) / E. Dassler (author) / J. Walizer (author)

    Publication date :

    1996


    Size :

    5 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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