Under which condition is Autothrottle ICE mode active?

The Autothrottle ICE mode becomes active when propeller de-ice is selected. This mode is designed to adjust engine performance to optimize safety and efficiency, particularly in conditions where ice accumulation on the propeller could be a concern. When prop de-ice is in operation, it indicates that there may be freezing conditions that could affect propeller performance. The Autothrottle system then automatically compensates for any potential loss of thrust due to ice on the propeller blades, ensuring that the aircraft maintains optimal performance.

While engine anti-ice and outside air temperature conditions are relevant considerations for flight safety, they do not directly trigger the Autothrottle ICE mode. The option regarding d is misleading; ICE mode is not always active, as it specifically requires the selection of prop de-ice to engage this safety feature.