Which statement describes wing anti-ice schedules and slats?

Which statement describes wing anti-ice schedules and slats?

• A. There are two wing anti-ice schedules, and the AILC uses a higher temperature when slats are extended.
• B. There are two wing anti-ice schedules, and the AILC uses a lower temperature when slats are extended.
• C. There is one wing anti-ice schedule, and temperature is fixed.
• D. Wing anti-ice is not used with slats extended.

Answer: (A)

Wing anti-ice scheduling depends on the position of the leading-edge devices. The system uses two heat schedules: a standard one when the slats are retracted and a higher-temperature schedule when the slats are extended. Extending the slats changes the leading-edge geometry and airflow, creating more potential ice-prone surfaces, so the AILC raises the anti-ice temperature to ensure effective protection. If there were only one schedule or a fixed temperature, ice protection wouldn’t adapt to the wing’s configuration, especially with slats out. Anti-ice operation is used with slats extended, not avoided, which is why the higher-temperature setting during slat extension is the correct description.

Wing anti-ice scheduling depends on the position of the leading-edge devices. The system uses two heat schedules: a standard one when the slats are retracted and a higher-temperature schedule when the slats are extended. Extending the slats changes the leading-edge geometry and airflow, creating more potential ice-prone surfaces, so the AILC raises the anti-ice temperature to ensure effective protection. If there were only one schedule or a fixed temperature, ice protection wouldn’t adapt to the wing’s configuration, especially with slats out. Anti-ice operation is used with slats extended, not avoided, which is why the higher-temperature setting during slat extension is the correct description.