When do post-stall gyrations occur in an aircraft?

Post-stall gyrations occur when the aircraft has exceeded its critical angle of attack (AOA), resulting in a stall, and the control surfaces become ineffective due to the disruption in airflow. During this phase, the aircraft can enter an uncontrolled state where it experiences rapid yawing, rolling, or pitching movements, known as gyrations. These movements are essentially the result of the aerodynamic limits being exceeded, and the pilot loses effective control over the aircraft.

While the other options describe situations that do not align with the conditions under which post-stall gyrations would occur, understanding that post-stall gyrations are inherently linked to loss of control after a stall is critical. This knowledge is essential for recognizing the signs of a stall and taking proactive measures to recover before post-stall gyrations begin.