The inspection of engine parts during overhaul is divided into which three categories?

The correct response identifies the three categories of engine part inspections during an overhaul as Visual, Structural NDT (Nondestructive Testing), and Dimensional.

Visual inspections involve examining the engine components to identify any surface defects, signs of wear, or other anomalies that could affect performance or safety. This type of inspection is critical because it allows for a general assessment of the component's condition without requiring disassembly.

Structural NDT encompasses various methods used to evaluate the integrity of components without causing damage. Techniques such as ultrasonic testing, magnetic particle inspection, and dye penetrant inspection are included in this category. NDT is vital for detecting internal flaws, stress fractures, or material weaknesses that might not be visible during a visual inspection.

Dimensional inspections ensure that the engine components meet specified tolerances and measurements as defined by engineering standards. Accurate measurements are essential for safe operation and assembly of the engine, as any deviations could lead to performance issues or failures.

In contrast, the other options either include categories that are too broad or specific or do not accurately represent the key inspection aspects required for engine overhaul. For instance, functional inspections are generally more about verifying operation post-maintenance rather than during the disassembly process.