What does NDT stand for in aircraft maintenance contexts?

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Non-Destructive Testing is a group of inspection methods used in aviation to evaluate the condition of parts without damaging them. In aircraft maintenance, NDT lets technicians find hidden flaws such as cracks, corrosion, voids, or delaminations while the component remains intact, often allowing it to stay in service or be repaired without removing or destroying the part. Techniques include visual inspection, liquid penetrant, magnetic particle, eddy current, ultrasonic, and radiographic testing. Because no damage is done to the part during assessment, NDT is essential for ensuring safety and reliability by catching issues early and guiding timely repairs. The other terms don’t reflect recognized aviation inspection practices.