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

What indicates that engine anti-ice is on (EAI)?

1. Red light on the EICAS

2. Green display above the EICAS N1 gauge

3. Amber caution message on the display

4. Sound alarm in the cockpit

The correct answer is: Green display above the EICAS N1 gauge

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.