Which statements correctly describe wing anti-ice and engine anti-ice systems on the A320, and when they should be activated?

• A. Wing anti-ice heats wing leading edges to prevent icing; engine anti-ice governs anti-ice for engine inlets and accessories; activated per icing conditions per SOP.
• B. Wing anti-ice heats the entire wing surface.
• C. Wing anti-ice uses hot air from the engine; engine anti-ice uses electric heaters; activated during rain only.
• D. Wing anti-ice is optional; engine anti-ice has no effect; activated at pilot discretion.

Answer: (A)

Wing anti-ice and engine anti-ice are two separate systems designed to prevent icing where it would impact performance. Wing anti-ice heats the leading edges of the wings—this is the critical area that first encounters air and ice. Keeping the leading edges free of ice maintains smooth airflow, preserving lift and preventing an increase in stall speed. Engine anti-ice protects the engine inlet and related accessories; by heating these components, it prevents ice from forming where it could block the intake or affect engine operation.

Both systems use hot bleed air from the engines to provide the required heat, and they are commanded on according to icing conditions defined by the operating procedures. They’re not meant to heat the entire wing or be left on only in rain or at pilot discretion; activation follows the presence of icing conditions as specified by the SOP, ensuring anti-ice is used when needed to maintain safe performance.