Above 230 KIAS, which surfaces are heated by the anti-ice system?

• A. Cowls
• B. Wings and Cowls
• C. Wings
• D. Pylons

Answer: (A)

Anti-ice systems heat surfaces to prevent ice from forming where it would affect performance or safety. In this scenario, when you’re above 230 KIAS, the system is configured to heat only the engine cowls. The heated cowls protect the engine nacelles and inlet from ice buildup that could disrupt airflow and thrust at higher speeds. Wing leading edges aren’t heated at this speed in this configuration, and pylons aren’t heated by the anti-ice system here, likely because icing concerns and system design don’t require heating those surfaces at that operating range. So the surface being heated above 230 KIAS is the cowls.