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 setting that may be required for adequate ice protection.
• B. The arc turns blue to 50%
• C. A red block appears at 60%
• D. The gauge shows 77% in green

Answer: (A)

When wing anti-ice is turned on, the N2 gauge uses a color cue to show the power setting related to providing enough bleed air for ice protection. The arc turning white up to about 77% indicates the N2 range that may be required to ensure adequate anti-ice capability. It gives the crew a quick visual reference that the engine is in the appropriate high-N2 region to supply sufficient bleed air for the wing anti-ice system.

Other color/marks described in the distractors don’t match this instrument cue. The important idea is the white arc up to 77% as the indicator when anti-ice is active.