During dynamic rollover the helicopter exceeds its ______.

• A. Max Bank Angle
• B. Yaw Angle Limit
• C. Critical Rollover Angle
• D. Roll Angle Limit

Answer: (C)

During dynamic rollover there is a specific bank angle at which the roll tends to become self-reinforcing and recovery becomes unlikely. That point is known as the critical rollover angle. Once the helicopter reaches this angle, the combination of lateral inertia, weight transfer toward the outside of the roll, and the ground contact forces makes it extremely difficult to stop the roll with corrective control inputs. Before reaching this angle, a timely reduction of bank and opposite cyclic can arrest the motion and relevel the rotor plane.

This phrase isn’t about a general maximum bank limit, a yaw limit, or a simple roll-angle limit. It describes a threshold where the dynamics of rollover shift from survivable to unrecoverable given typical responses, which is why it’s the best answer.