What type of lines are used on aircraft drawings to indicate hidden views?

In aircraft drawings, medium width dashed lines are specifically used to represent hidden views or features that are not visible in the current view. The dashed lines indicate that the component or part exists but is obscured from view in the drawing. This convention is essential for accurately communicating the design and structural features of an aircraft, allowing mechanics, engineers, and builders to understand what lies behind visible surfaces.

By using medium width dashed lines, the drawing clearly distinguishes hidden elements from other types of features. This visual distinction helps prevent confusion when interpreting the drawings, ensuring that important parts are not overlooked when assembling or inspecting components. Furthermore, this standard practice is consistent with guidelines established by industry standards, making it easier for anyone familiar with aircraft documentation to interpret the drawings correctly.