A fastening device for fastening a movable element to a structure includes a support member and at least one belt retractor having a retractable belt and a fitting. The belt retractor may be fastened to a support member. The belt retractor is arranged in such a way that, if the fitting couples the structure and the movable element, the retractor prevents unrolling of the belt by more than a predefinable range if an external force, such as sudden mid-air turbulence acts on the movable element. Thus, the movable element is secured.