Abstract: A method and apparatus for operating an aircraft. The aircraft is flown. A skin panel is held on a support structure. The support structure has flanges on a number of edges of the support structure, the flanges being substantially orthogonal to the edges. The support structure also has openings into the support structure substantially orthogonal to the flanges. First connecting structures on clips are connected to the flanges and positioned such that an opening in each clip is aligned with one of the openings in the support structure. The skin panel is positioned such that the clips are received in holes in the skin panel. Fasteners are attached to the second connecting structures such that the support structure holds the skin panel.

Abstract: A method and apparatus may be provided for performing an operation on a workpiece. A tool holder with a tool and the workpiece may be positioned relative to each other. The tool holder may be attached to a machine. The tool may have a sleeve and a number of cutting features. The sleeve may have a first end, a second end, a surface, and a channel with an opening at the first end of the sleeve and an opening at the second end of the sleeve. The sleeve may receive at least a portion of a rod for the tool holder in the channel. A stiffness of the sleeve may be greater than a stiffness of the tool holder. The number of cutting features may be associated with the surface of the sleeve. The operation may be performed using the tool holder with the tool on the workpiece.

Abstract: A method and apparatus for managing machining. A desired level of engagement of a tool may be identified with a workpiece. A tool path for the tool may be generated relative to the workpiece. The tool path may have a number of levels of engagement of the tool with the workpiece along the tool path. The number of levels of engagement of the tool with the workpiece along the tool path may be based on the desired level of engagement.