What is non-destructive testing (NDT) and name two common methods used in aerospace maintenance?

What is non-destructive testing (NDT) and name two common methods used in aerospace maintenance?

• A. A destructive procedure used for material property testing
• B. Testing methods that detect flaws without damaging the part; examples include ultrasonic testing and dye penetrant inspection
• C. A visual inspection only method
• D. A method used only in manufacturing

Answer: (B)

Non-destructive testing means evaluating a component for flaws or degradation without altering its usefulness or removing it from service. In aerospace maintenance, two common methods are ultrasonic testing and dye penetrant inspection. Ultrasonic testing uses high-frequency sound waves sent into the material with a probe. The waves travel until they meet a boundary or flaw, and reflections are detected and analyzed to reveal internal defects or to measure material thickness. This technique works well for metals and composites and can inspect welds, joints, and interior areas that aren’t visible. Dye penetrant inspection relies on a liquid that seeps into surface-breaking cracks or flaws. After a dwell time, excess liquid is removed and a developer is applied to draw out the penetrant, making flaws visible under bright light or UV light. It’s particularly effective for detecting small surface cracks on accessible surfaces, especially on non-porous materials. Other descriptions that imply destruction, rely only on visual checks, or apply strictly to manufacturing don’t fit non-destructive testing in maintenance.

Non-destructive testing means evaluating a component for flaws or degradation without altering its usefulness or removing it from service. In aerospace maintenance, two common methods are ultrasonic testing and dye penetrant inspection.

Ultrasonic testing uses high-frequency sound waves sent into the material with a probe. The waves travel until they meet a boundary or flaw, and reflections are detected and analyzed to reveal internal defects or to measure material thickness. This technique works well for metals and composites and can inspect welds, joints, and interior areas that aren’t visible.

Dye penetrant inspection relies on a liquid that seeps into surface-breaking cracks or flaws. After a dwell time, excess liquid is removed and a developer is applied to draw out the penetrant, making flaws visible under bright light or UV light. It’s particularly effective for detecting small surface cracks on accessible surfaces, especially on non-porous materials.

Other descriptions that imply destruction, rely only on visual checks, or apply strictly to manufacturing don’t fit non-destructive testing in maintenance.