Which blade damage indicators suggest possible delamination or structural compromise?

Which blade damage indicators suggest possible delamination or structural compromise?

• A. Cracks through blade, major punctures, leading edge erosion, visible delamination under coating, unusual blade flutter.
• B. Minor surface scratches only.
• C. Dents along the blade surface without any cracks.
• D. Normal wear with no signs of damage.

Answer: (C)

Damage to a rotor blade that may indicate delamination or a structural problem shows up as signs of internal separation or loss of stiffness, not just cosmetic marks. Cracks through the blade are critical because they can propagate through the blade’s material and sever the load path, signaling a serious integrity issue. A major puncture breaches protective layers and can expose inner structure, again pointing to possible compromise. Erosion of the leading edge can reveal or hasten internal damage and reduce the blade’s ability to carry loads safely. If delamination is visible under the coating, you’re seeing actual separation of internal layers, which directly compromises strength. Unusual blade flutter is another strong indicator because it suggests changes in the blade’s stiffness and aerodynamics due to internal damage. In contrast, dents without cracks or only minor surface scratches are not reliable indicators of delamination by themselves, and normal wear shows no signs of active structural damage.

Damage to a rotor blade that may indicate delamination or a structural problem shows up as signs of internal separation or loss of stiffness, not just cosmetic marks. Cracks through the blade are critical because they can propagate through the blade’s material and sever the load path, signaling a serious integrity issue. A major puncture breaches protective layers and can expose inner structure, again pointing to possible compromise. Erosion of the leading edge can reveal or hasten internal damage and reduce the blade’s ability to carry loads safely. If delamination is visible under the coating, you’re seeing actual separation of internal layers, which directly compromises strength. Unusual blade flutter is another strong indicator because it suggests changes in the blade’s stiffness and aerodynamics due to internal damage.

In contrast, dents without cracks or only minor surface scratches are not reliable indicators of delamination by themselves, and normal wear shows no signs of active structural damage.