The refers to the Descriptions (DSC) section of the Flight Crew Operating Manual (FCOM) , which serves as a technical deep-dive into the aircraft's systems and their underlying logic . Unlike procedural chapters, the DSC is intended for study and reference, providing detailed diagrams , control panel layouts, and functional explanations for everything from hydraulics to avionics . Key Systems Covered in A320 DSC

Provides schematics and controls for wing anti-ice, engine anti-ice, and probe heating.

Details the AC and DC power generation, including the use of external power and the APU during startup.

Describes the three independent systems (Green, Blue, and Yellow) and components like the PTU (Power Transfer Unit) . How to Use the DSC for Training

Explains the fly-by-wire architecture, including the ELAC (Elevator Aileron Computer), SEC (Spoiler Elevator Computer), and FAC (Flight Augmentation Computer) for yaw and trim.

The DSC section is organized into subsections (often following ATA chapters) that detail how each system works: