Which surfaces are typically protected by anti-ice systems?

Which surfaces are typically protected by anti-ice systems?

• A. Wing trailing edges, tail surfaces.
• B. All surfaces equally protected.
• C. Wing leading edges, horizontal stabilizer leading edges, engine inlets, and nacelle surfaces.
• D. Only engine inlets.

Answer: (C)

Anti-ice systems focus on surfaces where ice would most disrupt aerodynamics or engine operation. The leading edges of wings and the leading edges of the horizontal stabilizer are where ice forms first and where a rough, iced surface can dramatically alter airflow, raise stall speed, and reduce lift. Protecting these edges helps preserve predictable handling and performance. Engine inlets and nacelle surfaces are protected to prevent ice from restricting or altering the engine intake, which could lead to compressor stalls or engine damage. Since heating the entire aircraft isn’t practical, anti-ice systems target these critical surfaces to maintain safe operation. Surfaces like trailing edges or other non-leading-edge areas are not the primary focus because they’re less likely to cause immediate, dangerous changes in lift or engine performance.

Anti-ice systems focus on surfaces where ice would most disrupt aerodynamics or engine operation. The leading edges of wings and the leading edges of the horizontal stabilizer are where ice forms first and where a rough, iced surface can dramatically alter airflow, raise stall speed, and reduce lift. Protecting these edges helps preserve predictable handling and performance. Engine inlets and nacelle surfaces are protected to prevent ice from restricting or altering the engine intake, which could lead to compressor stalls or engine damage. Since heating the entire aircraft isn’t practical, anti-ice systems target these critical surfaces to maintain safe operation. Surfaces like trailing edges or other non-leading-edge areas are not the primary focus because they’re less likely to cause immediate, dangerous changes in lift or engine performance.