What should you do after opening the MCD in Emergency Mode for landing on the ERJ?

The correct action after opening the Multi-Function Control Display (MCD) in Emergency Mode for landing on the ERJ is to pull the manual inflation handle. This step is critical in preparing for a potential evacuation, as it will ensure that the emergency exit slides are properly inflated and ready for use once the aircraft has come to a stop. This preparation is vital for ensuring the safety of all passengers and crew members during an emergency situation.

Each of the other choices, while potentially necessary steps in an emergency, do not directly follow the action of opening the MCD in Emergency Mode. Closing the MCD securely could be a procedural step taken later, but at this specific moment, the priority is the immediate preparation for evacuation. Preparing for evacuation is indeed a related action, but the act of pulling the manual inflation handle is more immediate to ensuring that the means of evacuation are ready. Signaling the cockpit might also be appropriate, but again, the priority after verifying the emergency mode is to ensure the evacuation apparatus is operational.