High-level operation of critical systems such as Fly-By-Wire flight controls, electrical (AC/DC), hydraulics, fuel, and the APU.
: Using a "dark cockpit" philosophy where lights only illuminate if a system requires attention. Airbus A320 General Familiarization Pdf
From the electrical architecture (the infamous "BUS" system) to the "Three Systems" of hydraulics—Green, Blue, and Yellow—the PDF maps the flow of energy. It is a colorful journey. The reader learns that the Yellow system drives the cargo doors, the Green system drives the landing gear, and the Blue system is the emergency backup driven by a ram air turbine (RAT). High-level operation of critical systems such as Fly-By-Wire