What condition is signified by the ANTI ICE annunciator?

• A. Anti-ice off
• B. Anti-ice on
• C. Engine overheating
• D. Fuel temperatures high

Answer: (B)

The ANTI ICE annunciator indicates that the anti-ice system is engaged and functioning properly. This system is critical in preventing the formation of ice on vital aircraft components, such as the wings and engine inlets, particularly during flight in icy or winter conditions. When the annunciator illuminates, it serves as a clear indication to the pilot that anti-ice operations are active, thereby ensuring that the aircraft maintains safe aerodynamic performance and engine efficiency by mitigating ice-related hazards.

In this context, the other options do not accurately reflect the meaning of the ANTI ICE annunciator. For instance, if the system were off, a different annunciator would typically indicate that; instead, the illumination signifies the "on" condition, enhancing the aircraft's safety in relevant flight conditions. Hence, understanding the function of the annunciator is crucial for effective aircraft operation and safety management during flight.