eddy current inspection


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eddy current inspection

eddy current inspection
Eddy current which is induced in a disc moving through a nonuniform magnetic field.
A nondestructive testing technique (NDT) that interrogates a component for surface inconsistencies and conditions such as hardness, conductivity, etc. It can only be applied to conductive materials. Eddy current testing generates small alternating magnetic fields on the surface of the component, and these magnetic fields interact with conductive components to generate small eddy currents on the surface. These currents in turn generate their own secondary alternating magnetic fields that interact with the primary fields. By analyzing the interaction, the defects and the changes in the conductivity and the permeability of the surface can be analyzed. The detection limits of the technique depend upon the surface condition of the piece under examination. It is normally not possible to detect defects that are smaller than about three times the surface roughness of the component. The detectable length of defects depends upon the integrity of the scan pattern.
References in periodicals archive ?
This AD would require repetitive high frequency eddy current inspections to find cracking of the bulkhead frame support at body station 2598 under the hinge support fittings of the horizontal stabiliser, and repair if cracking is found.
The existing AD currently requires a one-time visual inspection and a one-time eddy current inspection and/or dye penetrant inspection of the nose landing gear (NLG) main fitting to detect cracking, as well as rework of the NLG main fitting if necessary.
This AD would require an eddy current inspection to detect cracks in the upper girder of the two main landing gear brackets (MLG) and repair of a cracked bracket followed by repetitive inspections, or replacement of a cracked MLG bracket with an improved bracket as applicable.
The existing AD requires repetitive visual and high frequency eddy current inspections to detect cracking of the corners of the door frame and the cross beams of the aft cargo door, and corrective actions if necessary.
The AD requires measuring the diameter of the hole counterbore of the outboard idler hinge fitting of the left and right wing flap; the performance of repetitive high frequency eddy current inspections to detect cracks at the flap idler hinge fitting if necessary and replacement of the flap idler hinge fitting with a new like part if any crack is detected.
This new technology makes eddy current inspections easier, more accurate and faster than ever before.
Under the amendment, which is effective from 9 May 2000, repetitive high frequency eddy current inspections are required, together with corrective actions where necessary.