Which type of lines are used to show alternate positions in aircraft drawings?

Phantom lines are specifically designed to illustrate alternate positions or outlines of components in aircraft drawings. They consist of long dashes alternated with shorter dashes and help convey movement or reference points that are not currently in a standard view. This characteristic makes them particularly useful in representing features such as the movement of control surfaces or the alternate positions of an assembly, allowing technicians and engineers to visualize scenarios that are not immediately apparent in the primary view.

In contrast, solid lines indicate visible edges and outlines of objects, making them distinct from phantom lines. Hidden lines represent edges that are not visible in the current drawing view but pertain to the same object. Center lines assist in establishing the midpoint of a symmetrical component but do not indicate alternate positions. Each of these line types serves its own purpose within technical drawings, but phantom lines specifically address the need to show alternate positions.