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

During which phase of flight should engine anti-ice be turned on after landing?

1. During final approach

2. Until engine shutdown

3. Only during taxiing

4. Immediately after takeoff

The correct answer is: Until engine shutdown

The engine anti-ice system is designed to prevent the build-up of ice on engine components, which can significantly affect performance and safety. After landing, it is crucial to ensure that the system remains engaged until the engine is shut down. This is particularly important if there is potential for ice accumulation on the engine while the aircraft is on the ground, for instance, during taxiing or when ambient conditions are conducive to icing. When the aircraft is still in motion post-landing, conditions such as low temperatures and moisture can lead to ice formation, which could compromise engine performance during the taxi phase. By keeping the engine anti-ice on until shutdown, the crew ensures that any ice that might have formed during the landing roll or taxiing is effectively mitigated, maintaining operational safety. The other options suggest turning off the anti-ice system prematurely, either during final approach, only during taxiing, or immediately after takeoff, which do not take into account the necessary precautions after landing, when the risk of ice remains a concern in certain conditions.