When conducting a borescope inspection of the compressor, why can Airfoil and tip cracks be difficult to detect?

Correct Answer: Option D — All of the above.

Compressor airfoil cracks are often tight, shallow, and located in areas with poor lighting or limited access. High-speed rotation during inspection makes visual tracking difficult, while degraded optics obscure fine details. These factors combined make detecting early-stage fatigue cracks extremely challenging, necessitating high-quality equipment and careful, methodical inspection techniques.