What is the primary purpose of non-destructive testing in aviation maintenance?

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Non-destructive testing is about finding hidden defects without altering or destroying the component, so its service life is preserved. In aviation, many flaws like internal cracks, corrosion, or delaminations aren’t visible on the outside, and removing material or taking the part apart would shorten its life or reduce reliability. NDT uses methods such as ultrasound, radiography, magnetic particle, dye penetrant, eddy current, and infrared thermography to detect those hidden issues while keeping the part intact. This lets maintenance teams decide whether a component can be repaired, monitored, or retired without causing unnecessary damage or downtime.