What is the primary effect of engine overspeed on fan blades?

The primary effect of engine overspeed on fan blades is that it can lead to fan blade shingling. Shingling refers to the situation where the fan blades are subjected to excessive centrifugal forces due to high rotational speeds. This can cause the blades to deform or shift from their original position, potentially leading to mishaps such as blade cracking, fracturing, or complete failure.

During overspeed conditions, the increased speed can exceed the design limits for both the blades and the associated components, making them more susceptible to issues like shingling. As the blades are crucial for maintaining proper airflow and thrust generation, any deformation can significantly impact engine performance and safety.

Understanding this phenomenon is crucial for engine performance and maintenance practices. Addressing overspeed events adequately can help prevent severe damage and ensure the longevity of the engine components.