General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

The indication that engine anti-ice is on is represented by a green display above the EICAS N1 gauge. This green indication signifies that the engine anti-ice system is activated and functioning properly, which is essential for preventing ice buildup on engine components, particularly during flight in cold and humid conditions. The green color typically denotes a normal operating condition, providing pilots with a clear and effective visual cue that engine anti-ice is engaged.

Other options, such as a red light on the EICAS, would usually indicate a malfunction or a critical warning rather than confirming that the engine anti-ice is operational. An amber caution message suggests a potential issue that requires attention, but it does not confirm the active status of the engine anti-ice system. A sound alarm in the cockpit may signal various warnings or alerts, but it is not specifically linked to the activation of engine anti-ice, making the green display the most accurate indication of its status.