How many wing anti-ice schedules are there?

The correct answer is two because the CRJ550 has two distinct wing anti-ice schedules that correspond to different operational scenarios. These schedules are designed to activate the wing anti-ice system appropriately based on the aircraft's flight conditions, such as during takeoff and initial climb or when encountering in-flight icing conditions.

One schedule is typically used during takeoff and landing phases when the aircraft is on the ground, ensuring the wings are adequately protected from ice formation during these critical phases of flight. The other schedule comes into play in-flight, responding to actual icing conditions by activating the anti-ice system to prevent ice accumulation on the wings.

Understanding these schedules is essential for pilots to maintain safe handling of the aircraft in various weather conditions, particularly those involving potential ice buildup on the wings.