An aircraft door comprising a system for equalizing an overpressure in the interior of an aircraft cabin with respect to the exterior of the aircraft, the system comprising: a fluid flow path adapted for providing fluid communication between the interior of an aircraft cabin and the exterior of the aircraft, a check valve having an opened state and a closed state and arranged and adapted to - enable fluid flow through the fluid flow path from the interior of the aircraft cabin to the exterior of the aircraft and to block fluid flow through the fluid flow path in the reverse direction when the check valve is in the opened state, and - block fluid flow through the fluid flow path in both flow directions when the check valve is in the closed state, a control means operatively coupled to the check valve and adapted for controlling the check valve to switch between the opened state and the closed state, wherein the control means is an electrical control means adapted for electrically controlling the check valve to selectively operate in its opened state or in its closed state, and a sensor operatively coupled to the control means and adapted for detecting touchdown of the aircraft, stopping of the aircraft, descending of the aircraft below a predetermined height and/or the exterior pressure of the aircraft exceeding a predetermined pressure and for generating a corresponding first detection signal, and wherein the control means is adapted for controlling the check valve to operate in its opened state upon receiving the first detection signal. a fluid flow path adapted for providing fluid communication between the interior of an aircraft cabin and the exterior of the aircraft, a check valve having an opened state and a closed state and arranged and adapted to - enable fluid flow through the fluid flow path from the interior of the aircraft cabin to the exterior of the aircraft and to block fluid flow through the fluid flow path in the reverse direction when the check valve is in the opened state, and - block fluid flow through the fluid flow path in both flow directions when the check valve is in the closed state, - enable fluid flow through the fluid flow path from the interior of the aircraft cabin to the exterior of the aircraft and to block fluid flow through the fluid flow path in the reverse direction when the check valve is in the opened state, and - block fluid flow through the fluid flow path in both flow directions when the check valve is in the closed state, a control means operatively coupled to the check valve and adapted for controlling the check valve to switch between the opened state and the closed state, wherein the control means is an electrical control means adapted for electrically controlling the check valve to selectively operate in its opened state or in its closed state, and a sensor operatively coupled to the control means and adapted for detecting touchdown of the aircraft, stopping of the aircraft, descending of the aircraft below a predetermined height and/or the exterior pressure of the aircraft exceeding a predetermined pressure and for generating a corresponding first detection signal, and wherein the control means is adapted for controlling the check valve to operate in its opened state upon receiving the first detection signal.