What EICAS messages cannot be removed from view by boxing?

• A. All messages
• B. Only advisories
• C. Warnings (red) and advisories (green)
• D. Only warnings

Answer: (C)

The key idea is that EICAS is designed to keep the most important alerts on screen until they’re dealt with. Boxing is a way to hide nonessential messages and reduce clutter, but some messages are considered so critical that they must remain visible regardless of boxing.

Warnings (red) signal immediate action is required and must stay visible to ensure the crew doesn’t miss a safety-critical issue. Advisories (green) indicate important information or actions, but not as urgent as warnings; they also should remain accessible to the crew. Because of that design, both warnings and advisories cannot be removed from view by boxing.

Other, less critical messages can be boxed away to declutter the display, which is why the option stating that both warnings and advisories cannot be boxed is the correct one.