Which of the following represents a 'gouge' in blade maintenance?

A 'gouge' in blade maintenance is defined as the displacement of material from a surface, which is commonly associated with damage that affects the structural integrity and aerodynamic performance of the blade. Gouges can occur due to impacts, wear, or other forms of mechanical abuse, and they often require careful assessment and repair to ensure that the blade continues to function effectively and safely.

In the context of blade maintenance, identifying and addressing gouges is critical because they can lead to further deterioration if not properly managed. Recognizing this specific type of damage helps maintenance personnel prioritize necessary repairs and maintain operational readiness.

The other options refer to different conditions that do not accurately define a gouge. For instance, while a bent blade indicates physical deformation, it does not specifically describe the displacement of material as a gouge does. A smooth surface repair and a small, rounded hollow relate to different types of blade conditions and repairs which do not capture the essence of what constitutes a gouge.