How many wing and anti ice schedules are there?

• A. One
• B. Two
• C. Three
• D. Four

Answer: (B)

Anti-ice protection is split across separate subsystems, each with its own control logic. The wings and the engines (or nacelles) have different surfaces, heat requirements, and icing conditions that trigger protection, so each uses its own schedule. That means you need two schedules to cover both wing anti-ice and engine anti-ice properly. If there were only one schedule, protection could be inadequate for one of the systems, and having more schedules isn’t necessary given the typical two-subsystem setup. So the correct count is two.