When can CAUTION messages be paged and boxed?

• A. Boxed only with engines at takeoff thrust
• B. Boxed with both engines at stabilized idle
• C. Always boxed, regardless of engine state
• D. Not pageable or boxable

Answer: (B)

CAUTION messages are meant to surface important but non-emergency issues without cluttering crew workload during critical phases. The system can page and box a CAUTION only when engine conditions are stable, so the alert is meaningful and not a transient artifact of power changes. When both engines are at stabilized idle, parameters are steady, allowing the message to be highlighted in the display (boxed) and brought to the crew’s attention (paged) for appropriate action. If engines are at takeoff thrust or not stabilized, paging/boxing is generally avoided to prevent distraction during busy phases, so the CAUTION would not be emphasized in the same way. Hence, the best condition is when both engines are at stabilized idle.