to encompass at least a section of a corresponding rotary cylinder also a method of locking a door using the locking mechanism application_number US 201113076601 A description a locking mechanism of an aircraft door in accordance with an embodiment of the invention has a multiplicity of frame side and door side fittings the frame side fitting have pins on which an eccentric rotary cylinder is mounted in each case in accordance with the invention the door side fittings are designed as eccentric rotary latches for purposes of encompassing sections of the rotary cylinders the locking mechanism in accordance with the invention is distinguished in particular by a kinematic system that is reduced in its complexity and thus simplified since no movement of the door in the vertical direction is necessary for opening or closing purposes by this means a multiplicity of levers shafts and other mechanical actuation elements can be dispensed with as a result of which the locking mechanism is moreover optimized in terms of weight the lack of a rise or fall movement in the vertical direction makes possible a smaller fuselage side door aperture compared with conventional solutions as a result of which the stability of the fuselage is significantly increased moreover relatively narrow lateral gaps between the door and the door frame are possible furthermore by virtue of the lack of a rise or fall movement of the door a simplified sealing concept is possible furthermore the locking mechanism in accordance with embodiments of the invention enables a quasi floating mounting of the door in its fuselage side door frame so that no twisting of the fuselage is introduced into the door as a result of which both the door itself the connection of the door frame.