When blending a nicked blade, which direction is it accomplished in?

• A. Parallel to the length of the blade
• B. Perpendicular to the length of the blade
• C. Diagonal along the blade angle
• D. In a circular motion around the edge

Answer: (B)

When repairing a nicked blade, the goal is to restore a smooth, continuous aerodynamic contour without altering the blade’s thickness distribution in a way that could initiate fatigue. Blending perpendicular to the blade length achieves this by removing material and blending the damaged area in cross sections, creating a gradual, rounded transition that preserves the spanwise thickness and surface geometry. Grinding along the length would carve a groove or line that runs with the blade, potentially thinning the profile and acting as a fatigue crack starter. Diagonal blending or circular motion around the edge can leave irregular shapes or notches that disrupt the smooth airfoil surface and introduce stress concentrations.