Which of the following is a common non-destructive testing method used in aircraft maintenance?

Ultrasonic testing is indeed a widely recognized non-destructive testing (NDT) method employed in aircraft maintenance. This method utilizes high-frequency sound waves that are transmitted into the material being examined. The sound waves interact with any internal imperfections or discontinuities, such as cracks or voids, and are reflected back to the testing equipment. By analyzing these reflections, technicians can determine the presence, size, and location of flaws without causing any damage to the material.

Ultrasonic testing is particularly valuable in aircraft maintenance due to its ability to detect internal defects that are not visible on the surface. It is effective for assessing the integrity of critical components, such as metal structures and composite materials, making it essential for ensuring safety and reliability in aviation.

The other methods listed also serve important roles in non-destructive testing within the industry. However, each has its specific applications and limitations. Understanding these methods helps technicians choose the right approach based on the situation, the materials in question, and the nature of potential defects.