Nondestructive testing is used in investigations to...

• A. Evaluate material properties without damaging the part.
• B. Remove the part from service immediately.
• C. Determine the flight crew's actions.
• D. Detect internal flaws without causing damage.

Answer: (D)

Nondestructive testing is about finding hidden flaws inside a component without altering it. This lets investigators identify internal cracks, voids, or other defects while keeping the part intact, which is essential when the item may still be in use or needs further analysis. The goal isn’t to remove the part from service or to assess unrelated actions, and while some tests can hint at material properties, the primary purpose in investigations is to detect internal flaws without causing damage.