Final answer:
The stall horn warning system is a safety feature in aircraft that alerts pilots when the angle of attack is too high, indicating a potential stall. Examples of stall horn warning systems include the stick shaker and the angle of attack indicator.
Step-by-step explanation:
A safety feature on aircraft, the stall horn warning system alerts pilots when the aircraft is getting close to or at the critical angle of attack, which can cause a stall. Usually, it consists of an audible alert, such as a horn, that sounds when the angle of attack gets too high. This alert enables pilots to avoid stalls, which can be exceedingly hazardous, by taking the necessary precautions.
The stick shaker is one type of stall horn warning system. To warn the pilot of an impending stall, the stick shaker vibrates the control stick. The stick shaker gives the pilot tactile feedback when the angle of attack crosses a predetermined threshold.
Another example is the angle of attack indicator. This is a visual instrument that provides real-time information about the angle of attack. When the angle of attack exceeds a certain value, an alert is displayed, warning the pilot of the potential stall.