An aircraft door locking system comprises a first locking element fastenable to a first element of an aircraft door arrangement rotatable about a rotation axis and having a receiving opening and a bearing shell. A second locking element is fastenable to a door arrangement second element and comprises a locking bolt. In a release state, the locking bolt is insertable through the receiving opening and, by a rotation of the first locking element about the rotation axis in a locking direction, is positionable in the bearing shell to effect the locking state. A torque-generating device is configured, in the locking state, to generate a torque opposing a rotation of the first locking element about the rotation axis in a release direction opposite to the locking direction if a force directed substantially perpendicular to the rotation axis is exerted on the bearing shell and/or on the locking bolt.