When does the screen display the MAINTENANCE page?

The MAINTENANCE page is available on the display system of the A320 primarily while the aircraft is on the ground, either before engine start or after engine shut-down. This is crucial for maintenance personnel and flight crews to assess the aircraft's systems and perform necessary checks while the aircraft is in a stable and non-flight condition.

Displaying the MAINTENANCE page at this time allows for easy access to system status and troubleshooting information, facilitating any required checks prior to a flight or responding to maintenance requirements after a flight is completed. This dedicated access to maintenance information ensures that all necessary evaluations can be performed without the distractions or complexities of conducting them in-flight or immediately post-landing when operational priorities shift.

In-flight scenarios or during landing typically shift focus to operational data and flight management, making this specific operational check during ground conditions most effective for maintenance procedures.