Which indicators are looked for during rotor blade inspection to detect cracks, light impact damage, or corrosion?

Which indicators are looked for during rotor blade inspection to detect cracks, light impact damage, or corrosion?

• A. Cracks through blade, major punctures, leading edge erosion, visible delamination under coating, and unusual blade flutter.
• B. Surface rust only on the blade tips.
• C. Cracks around the hub and torsion link indicating rotor misalignment.
• D. Knots in the blade with no structural damage.

Answer: (C)

Focusing inspection on the area around the blade root where the blade attaches to the hub and the torsion link is crucial. These joints bear the highest bending and torsional loads, so small cracks or signs of distress tend to show up there first. A crack in this region is a direct hint of rotor misalignment and potential structural damage that could propagate if not addressed, making it the most reliable indicator for cracks, light impact damage, or corrosion affecting the blade. Other signs like surface rust only on the blade tips or damage with no structural context aren’t as telling about the integrity of the root and hub area. Cracks around the hub and torsion link specifically point to issues that can alter rotor alignment and overall airframe safety, which is why they’re the focus for detecting these problems.

Focusing inspection on the area around the blade root where the blade attaches to the hub and the torsion link is crucial. These joints bear the highest bending and torsional loads, so small cracks or signs of distress tend to show up there first. A crack in this region is a direct hint of rotor misalignment and potential structural damage that could propagate if not addressed, making it the most reliable indicator for cracks, light impact damage, or corrosion affecting the blade.

Other signs like surface rust only on the blade tips or damage with no structural context aren’t as telling about the integrity of the root and hub area. Cracks around the hub and torsion link specifically point to issues that can alter rotor alignment and overall airframe safety, which is why they’re the focus for detecting these problems.