How does an engine failure affect the propeller under normal conditions?

When an engine failure occurs in the T-6A, the propeller is designed to feather due to oil pressure loss. This is a crucial safety feature that minimizes drag and allows for a better glide in the event of an engine failure. Feathering the propeller means that the blades are rotated to a position where they are parallel to the airflow, significantly reducing drag and enabling the aircraft to maintain a more efficient glide path.

When the engine fails, the loss of oil pressure—needed for the propeller's pitch change mechanism—causes the blades to move into the feathered position automatically. This helps optimize performance during engine-out operations and provides the pilot with more control during descent and landing.

The other responses do not accurately describe the behavior of the propeller during an engine failure. For instance, the propeller does not continue to rotate normally, as that would create significant drag. Similarly, it does not lock in place or rotate in reverse; rather, it automatically transitions to a feathered position for efficiency in a glide.