What happens when only one ice detector detects ice?

When only one ice detector detects ice, the system triggers an ICE caution. This is an essential safety feature designed to alert the flight crew to potential icing conditions that could affect aircraft performance and safety. The warning is aimed at ensuring that the crew remains vigilant and can take appropriate actions to mitigate the risks associated with icing, such as adjusting altitude or changing flight paths.

This caution is vital because even a single detector indicating ice can signify that the aircraft is entering an environment where icing may become a factor, thereby allowing the crew to prepare and respond according to established protocols. Continuous monitoring and awareness of ice conditions are crucial, as ice accumulation can lead to increased drag, reduced lift, and potentially hazardous situations if not addressed timely.