The DC-9 Classic comes with these 6 liveries in the release package:
Why do you have to open the pneumatic crossfeed valves to de-ice the wings? Exactly what does the AC bus cross-tie switch do? And why do the engines only draw fuel from the center tank when all the fuel booster pumps are on? The key to understanding these and many other aspects of your aircraft is studying the schematic drawings for the various aircraft systems. That may sound a little bit dry, but to help you out I have included a Schematics section in the DC-9 Classic Flight Center that gives you live interactive schematic drawings.
The Flight Center is the starting point for all aircraft administration, dispatch, options, training and failure simulation. You can also access the Navigation Simulator and the live schematic system views from the Flight Center.