What warning is provided by the ice detection system on the 737-800?

The ice detection system on the 737-800 is designed specifically to monitor and detect the formation of ice on critical surfaces of the aircraft. When ice is detected, the system provides an alert to the pilots. This is essential for safe operation as ice can significantly affect the aircraft's performance and control. Ice accumulation on wings, tail surfaces, or in the engine can lead to aerodynamic issues and potential hazards during flight, which is why the timely warning helps pilots take necessary precautions, such as activating anti-ice systems or changing flight parameters to ensure safety.

Other options relate to different functions that are not associated with the ice detection system. Notifications related to engine performance, reminders for maintenance checks, or signals for fuel system issues do not pertain to ice detection and therefore do not address the purpose of the system in question.