Define engine N.D.T.

• A. The means of checking the external and internal condition of aircraft and engine parts without changing their airworthiness
• B. A process to repair parts
• C. A destructive testing method
• D. A certification program for maintenance

Answer: (A)

Non-destructive testing is a set of inspection techniques used to assess the condition of aircraft and engine parts without causing damage or changing their airworthiness. It looks for surface and subsurface flaws such as cracks, corrosion, porosity, or delamination while keeping the part fit for service. Common methods include visual inspection, dye penetrant, magnetic particle, eddy current, radiography, and ultrasonic testing. This approach is why the best choice describes checking the external and internal condition of components without altering their airworthiness. The other options describe repairing parts, destructive testing, or certification programs, which are not what NDT is.