Which statement is true regarding wing anti-ice operations when the slats are extended?

Which statement is true regarding wing anti-ice operations when the slats are extended?

• A. The AILC schedules a higher temperature when the slats are extended.
• B. The AILC schedules a lower temperature when the slats are extended.
• C. The AILC schedule remains unchanged with slat position.
• D. Wing anti-ice is automatically disabled when slats are extended.

Answer: (A)

Wing anti-ice temperature control is adjusted based on the wing’s leading-edge configuration. When the slats are extended, more leading-edge surface is exposed and the airflow around the wing changes, which can make ice accumulate more readily on the extended surfaces. To maintain effective protection across this larger and differently shaped leading edge, the AILC increases the bleed-air temperature setpoint. In other words, the anti-ice system schedules a higher temperature with the slats extended to ensure adequate heat transfer and ice protection. If the slats are retracted, the protective heating needs decrease, so a lower temperature would be sufficient. The system is not designed to disable wing anti-ice automatically just because the slats are extended.

Wing anti-ice temperature control is adjusted based on the wing’s leading-edge configuration. When the slats are extended, more leading-edge surface is exposed and the airflow around the wing changes, which can make ice accumulate more readily on the extended surfaces. To maintain effective protection across this larger and differently shaped leading edge, the AILC increases the bleed-air temperature setpoint. In other words, the anti-ice system schedules a higher temperature with the slats extended to ensure adequate heat transfer and ice protection. If the slats are retracted, the protective heating needs decrease, so a lower temperature would be sufficient. The system is not designed to disable wing anti-ice automatically just because the slats are extended.