In the event of an engine failure, there will be no way to provide air to the respective wing for ice protection. Which statement is true?

• A. Wing anti-ice cross-bleed selector knob can route air from the good engine to both wings
• B. There is no way to provide wing anti-ice after engine failure
• C. External air must be used for wing anti-ice
• D. Wing anti-ice relies on electric heating

Answer: (A)

Wing ice protection is typically powered by bleed air from the engines. When one engine fails, a cross-bleed path lets the bleed air from the surviving engine be routed to both wings. The cross-bleed selector controls this routing, so you can maintain anti-ice on both wings even with one engine out. This redundancy is exactly what keeps ice protection active when one source is lost. External air isn’t required in flight for this system, and the standard wing anti-ice method here is bleed-air heating rather than relying solely on electric heating.