What is the function of a stall warning system?

The primary function of a stall warning system is to alert the pilot of an impending stall. This system plays a critical role in aviation safety by providing warnings when the aircraft is approaching critical angles of attack, where airflow over the wings becomes insufficient to maintain lift. By notifying the pilot of this dangerous situation, the stall warning system helps ensure timely corrective actions can be taken to prevent a stall from occurring, thus enhancing overall control and safety of the aircraft during flight.

Other options do not pertain to the stall warning system. For example, enhancing fuel efficiency is related to optimizing aircraft performance but is not a function of the stall warning system. Assisting in navigation is typically the role of navigation instruments and systems, while regulating cabin pressure involves environmental control systems, which are unrelated to stall warnings or flight dynamics.