What is the function of the stick shaker in the stall warning system?

The function of the stick shaker in the stall warning system is to provide tactile feedback to the pilot. When an aircraft approaches its stall angle of attack, the stick shaker activates to vibrate the control yoke or stick. This vibration serves as a warning to the pilot that the aircraft is at risk of entering a stall condition, prompting immediate corrective action to prevent loss of control. This tactile feedback is essential since it allows pilots to recognize critical aerodynamic conditions even if they are not looking at their instruments.

Other options do not accurately reflect the role of the stick shaker. For example, extending the landing gear, triggering an alarm, or adjusting pitch trim are not functions associated with the stick shaker, as these actions relate to different systems within the aircraft. The primary purpose of the stick shaker is to ensure pilots receive a clear and immediate physical alert regarding their aircraft’s performance, allowing for quick response to potential stall situations.