How is the cabin altitude commanded back to the departure airport elevation in case of a flight abort?

The cabin altitude being commanded back to the departure airport elevation during a flight abort is primarily managed by the flight management system. In the event of an abort, the flight management system can automatically reconfigure the cabin pressure system to return to a pre-determined safe cabin altitude, which is set to match the elevation of the departure airport. This automatic adjustment helps ensure safety and comfort for the passengers and crew by rapidly transitioning to a lower cabin altitude when needed.

While pilot input on the pressurization control panel could influence cabin pressure settings, the automation of the flight management system is designed to handle such scenarios without requiring manual intervention, making it a more efficient and reliable option. Other options, such as emergency descent procedures, are aimed at scenarios requiring immediate descent but do not specifically command cabin altitude back to the departure airport elevation.