The major components of a gas turbine are represented by icons visible on the model window. However, some subsystem components or processes transmitting energy in the form of hot air or shaft power (shafts and bleed flows) are represented by model system objects. These objects are not visualized in the model window. The parameters defining the properties of invisible objects are always specified in a visible component model's data window.

An option List Invisible Components in the model menu is available to list the visible components. A window will be opened to display lists of shafts and bleeds. The window can be docked in the project window.

The Shafts tab sheet shows the hidden shaft components/objects and how these are connected.

The Bleeds tab sheet shows the hidden bleed in- and outflow ports and how these are connected.

The Deleted Components tab sheet displays a list of deleted case input components. Double-click on the entry to restore the component (only possible if there is no component of the same type present on the model window that have the "allow only one of this component type in the model" active, this is a developer design option, e.g. only a single case model component is allowed).