Which pushbutton on the overhead panel allows rapid depressurization?

The correct choice pertains to the function of the Dump Pushbutton, which is specifically designed to allow rapid depressurization of the cabin. This feature is utilized in certain emergency situations where immediate reduction of cabin pressure is necessary, such as in case of a rapid decompression event or when it is required for quick descent.

When the Dump Pushbutton is activated, it essentially opens the outflow valves to the atmosphere, enabling a prompt decrease in cabin pressure. This can be critical for maintaining safety and ensuring that oxygen levels are adequate for the occupants during emergencies.

In contrast, other options like the Emergency Air Conditioning Button, Rapid Depressurization Pushbutton, and Pressurization Control Button do not serve the same purpose. The Emergency Air Conditioning Button may relate to air conditioning management in emergencies but does not specifically facilitate rapid depressurization. The notion of a Rapid Depressurization Pushbutton may be misleading since the rapid depressurization process is executed through the Dump Pushbutton as described. The Pressurization Control Button typically manages normal cabin pressure settings rather than performing a rapid depressurization function.