In this work a software which simulates the interior acoustic of the aircraft passenger cabin, applied in the study of the reverberation time inside the aircraft passenger cabin, is used. This software considers all details of the aircraft passenger cabin, namely, seats, floor, side panels, roof, upper luggage compartment and binaural mannequins. These virtual mannequins, equipped with two ears and a mouth, allow for a new approach to acoustics in interior spaces. In this work, the geometry of the aircraft passenger cabin and the binaural manikin’s are prepared. In this preparation, the space was simplified by numerically reducing the number of surfaces, according to x, y and z direction, maintaining all geometry of the aircraft passenger cabin and the occupants. The reverberation time, in space with complex geometry, was calculated using two virtual manikin´s sitting side by side in the centre of the aircraft passenger cabin.