What immediate action should be taken in response to a stall warning in the Warrior PA-28A?

When a stall warning is activated in the Warrior PA-28A, the most critical immediate action is to reduce the angle of attack and add power. This response helps prevent an actual stall from occurring. The aircraft stalls when the angle of attack exceeds a critical threshold; therefore, lowering the angle of attack—usually by pushing the control yoke forward—reduces that angle and allows for smoother airflow over the wings.

Simultaneously adding power helps maintain lift as the aircraft may begin to lose altitude when decreasing the angle of attack. The combination of these actions ensures that the aircraft continues to fly safely and prevents a stall situation from escalating.

Turning off the autopilot, reducing speed to below stall speed, or initiating a descent may not address the immediate cause of stall warnings effectively and could lead to further complications if not followed by properly managing the angle of attack and power settings.