Read the following passage:
Eddy current testing is a non-destructive inspection method widely utilized in aviation maintenance to identify subsurface fatigue cracks in conductive metallic components without damaging the material. During the procedure, an inspection probe containing a coil energized with alternating current is swept across the surface of an aluminum structure. This alternating current induces circular eddy currents within the conductive test piece. If a crack or structural flaw disrupts the flow of these circulating currents, the secondary magnetic field changes, causing a measurable fluctuation in probe coil impedance. By interpreting these electrical signal variations, technicians can detect microscopic defects long before visible surface fissures develop.
Statement: The author's primary purpose in this passage is to explain the operational principle and diagnostic function of eddy current testing in aircraft maintenance.
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