What do stall warning systems do in aviation?

Stall warning systems are crucial safety features in aviation, specifically designed to alert pilots to the approach of a stall condition. A stall occurs when an aircraft exceeds its critical angle of attack, resulting in a significant loss of lift. These systems use various sensors to monitor the aircraft's speed and angle of attack, providing audible and visual warnings to the pilots when they are nearing a stall.

This early warning allows pilots to take corrective action—such as reducing the angle of attack or increasing power—to prevent the stall from occurring. The effectiveness of stall warning systems is vital in enhancing situational awareness and ensuring the safety of the aircraft and its occupants, particularly during critical phases of flight like takeoff and landing.

The other choices, while relevant to aviation, do not pertain to the primary function of stall warning systems. For instance, notifications about fuel reserve levels, optimal cruising altitudes, and real-time weather updates are essential for flight management but do not address the specific safety concerns related to stall conditions.