What will be seen on the N2 gauges when the wing anti-ice system is activated?

What will be seen on the N2 gauges when the wing anti-ice system is activated?

• A. The arc will turn white up to 77% to indicate power required for adequate ice protection.
• B. The arc will turn blue up to 77%.
• C. The arc will turn green at 77%.
• D. The arc will turn red at 77%.

Answer: (A)

Wing anti-ice relies on the engine to provide bleed-air power, and the N2 gauge uses a color arc to show the current power demand for that system. When the wing anti-ice is activated, the arc on the N2 gauge will appear white, extending up to about 77%. This white portion indicates that the engine is delivering the required power range to provide adequate ice protection. Reaching and showing that white arc up to 77% tells you the system is in the proper range to protect the wings. Other colors would signal different statuses, but for active wing anti-ice and proper protection, the white arc up to 77% is the expected indication.

Wing anti-ice relies on the engine to provide bleed-air power, and the N2 gauge uses a color arc to show the current power demand for that system. When the wing anti-ice is activated, the arc on the N2 gauge will appear white, extending up to about 77%. This white portion indicates that the engine is delivering the required power range to provide adequate ice protection. Reaching and showing that white arc up to 77% tells you the system is in the proper range to protect the wings. Other colors would signal different statuses, but for active wing anti-ice and proper protection, the white arc up to 77% is the expected indication.