What is the primary purpose of non-destructive testing (NDT) in maintenance?

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Non-destructive testing focuses on finding hidden flaws in a component without altering or damaging it. Its goal is to reveal internal defects such as cracks, voids, corrosion, or delaminations while the part remains intact, so maintenance can decide whether the part is safe to continue in service, needs repair, or should be retired. This capability is what makes NDT valuable: you can assess integrity and make informed maintenance decisions without removing material or destroying the part.

Removing material to test would be destructive and defeats the purpose of NDT. Checking only cosmetic finishes doesn’t address internal integrity that could compromise safety. Measuring electrical resistance is a specific test used for particular inspections but does not describe the broad aim of detecting hidden defects without damage.