A dedicated eddy current instrument, introduced by Staveley NDT Technologies is used to find flaws in aircraft fastener holes with the fastener remaining in place.
(1991), "Dedicated Eddy Current Unit: Inspection of Aircraft Fastener Holes With the Fasteners ‘In Situ’", Aircraft Engineering and Aerospace Technology, Vol. 63 No. 3, pp. 8-8. https://doi.org/10.1108/eb037066
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