If the lower ECAM screen fails, what crew action is required to view the data normally contained on the screen?

When the lower ECAM screen fails, the data traditionally displayed on that screen needs to be accessible to the crew for effective monitoring of the aircraft systems. By pushing and holding any SYS button on the upper ECAM, the SD data can be displayed there. This allows the crew to maintain situational awareness and still access critical system information, helping them to manage the aircraft's performance and safety effectively.

The upper ECAM screen is designed to provide an alternative display mode for system data, ensuring that, even in the event of a failure of the lower ECAM, the crew can retrieve necessary information without needing to rely solely on procedural workarounds or secondary checks. This function is crucial during flight operations where system monitoring is continuous and integral to flight safety.

Other options highlight incorrect methods of accessing the SD data after a lower ECAM failure. It's essential to understand that the functionality of pushing buttons on the ND or suggesting no action is required does not provide the necessary solutions to retrieve critical system data. The design is such that the interactivity and redundancy of the system allow for seamless transitions in displaying important flight data, prioritizing crew access to vital information.