A method for emergency ventilating and pressurizing an aircraft cabin comprises the steps of determining a cabin pressure (p c ) prevailing within the aircraft cabin and determining an ambient pressure (p a ) prevailing in an aircraft environment. Descent of the aircraft is initiated, when the cabin pressure (p c ) falls below a predetermined threshold value (p 1 ). A supply of ambient air from the aircraft environment into the aircraft cabin is initiated, when, during descent of the aircraft, a differential pressure (”p) between the cabin pressure (p c ) and the ambient pressure (p a ) falls below a first calculated threshold value (”p 1 ). The supply of ambient air from the aircraft environment into the aircraft cabin and an operation of an air outflow valve (28) of a cabin pressurisation system of the aircraft are controlled such that a flow (f) of ambient air from the aircraft environment into the aircraft cabin corresponds to at least a predetermined minimum value (f min ) and the differential pressure (”p) between the cabin pressure (p c ) and the ambient pressure (p a ) does not fall below a second calculated threshold value (”p 2 ).