Inspection Reliability of Nortec-30 Eddyscan System
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1995-08-01
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NTL Classification:NTL-AVIATION-Aviation Safety/Airworthiness
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Abstract:This report is in MS Word 6.0/95 format.
A key task of the Aging Aircraft Nondestructive Inspection Validation Center
(AANC) at Sandia National Laboratories is to establish and apply a consistent
and systematic methodology to assess the reliability of inspections through
laboratory and field experiments. Under this mandate the Nortec-30 Eddyscan
inspection system was evaluated using procedures and test specimens originally
developed to assess the reliability of eddy-current inspections for cracks
beneath fasteners. The Nortec-30 Eddyscan inspection system is designed for
testing fastener holes with the fastener in place. To evaluate its reliability,
the system was used to inspect simulated Boeing lap splice joints. The extent
and location of cracks in the upper skins were unknown to the inspector using
the equipment. The results of the experiment are discussed in this report in
terms of probability of detection curves. Comparisons are made to baseline
laboratory detection data obtained using other eddy current equipment. This
report is organized into four sections. Section 1 contains a brief product
description. Section 2 discusses the conditions surrounding the experiment and
the setup procedures followed in performing the experiment. Results of the
inspection are presented in the form of probability of detection (PoD) curves
and relative operating characteristic (ROC) curves in Section 3. A summary and
a discussion of the results are given in section 4.
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