Read the passage below:
Nondestructive testing technicians frequently rely on eddy current inspection to detect microscopic fatigue cracks in conductive aircraft skins without stripping protective paint. By inducing localized alternating electromagnetic fields into the aluminum alloy, the probe detects subtle disruptions in electrical conductivity caused by subsurface flaws. While ultrasonic and radiographic methods can penetrate thicker structural spars, eddy current testing provides rapid, highly sensitive surface-level scanning on assembled airframes. Consequently, maintenance depots prioritize this method during routine turnarounds to identify invisible micro-fractures before catastrophic structural failure occurs.
Statement: Based on the passage, the author's primary purpose is to explain the function and practical advantages of eddy current inspection in aircraft maintenance.
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