A plan view display or recording of a part under examination is known as what?

A plan view display or recording of a part under examination is referred to as a C-scan display. This type of display provides a two-dimensional view, mapping out the cross-section of the object being tested. The C-scan technique captures and represents data as a color map, where different colors indicate variations in material properties, such as thickness or the presence of defects. This visual representation makes it easier to understand the internal structure of the part and locate any anomalies or areas of concern, making it a valuable tool in nondestructive testing.

Both A-scan and B-scan displays serve different purposes; A-scan provides a one-dimensional view showing the amplitude of signals received over time, while B-scan offers a cross-sectional view depicting changes along a line, rather than a complete plan view. C-scan, on the other hand, excels in providing a full area representation, which is crucial for comprehensive analysis in many applications. D-scan is not a recognized mode in conventional ultrasonic testing terminology, which adds to the clarity of why C-scan is the appropriate answer.