When can caution messages be paged and boxed?

The correct answer is based on operational protocols related to the aircraft's system messaging. Caution messages can be paged and boxed when there is a page of messages and both engines are stabilized above 57% N2. This requirement ensures that the crew can focus on managing important flight operations when engine performance is optimal, and it enhances safety by minimizing distractions during critical phases of flight.

When both engines are above 57% N2, the aircraft is typically in a stable operating condition, which allows the flight crew to review and address the caution messages more effectively without compromising flight safety. This protocol is established to prioritize operational focus when handling potential issues indicated by the caution messages.

In other scenarios, such as when the engines are stabilized at any N2 or when there is just a single message present, the protocol does not support paging and boxing of the caution messages. This helps prevent unnecessary distractions during flight, ensuring the crew can maintain situational awareness and respond appropriately to any critical conditions.