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

When are the engine anti-ice switches turned ON if icing conditions exist on ground?

1. Before landing

2. After each engine start

3. Only during taxiing

4. Immediately after takeoff

The correct answer is: After each engine start

The practice of turning ON the engine anti-ice switches after each engine start when icing conditions exist on the ground is crucial for ensuring the safe operation of the aircraft. During ground operations in icing conditions, the engines are vulnerable to ice accumulation on critical components. Switching the engine anti-ice systems ON after each engine start helps to prevent ice build-up, which can lead to reduced engine performance or even engine failure. It is particularly important because ice can form due to the cold air entering the engine in combination with moisture present in the atmosphere during icing conditions. Therefore, activating the anti-ice systems as part of the pre-flight checks ensures that the engines remain clear of ice during all phases of ground operation. The other options address actions related to specific phases of flight rather than ground operations in icing conditions, making them unsuitable in this context. It's essential for flight crews to be aware of these procedures to mitigate risks associated with icing, thereby enhancing flight safety.