How many hydraulic systems does the A320 have and what are their color designations?

• A. Two independent hydraulic systems: Green and Blue.
• B. Three independent hydraulic systems: Green (Left), Yellow (Center), and Blue (Right).
• C. Four independent hydraulic systems: Green, Yellow, Blue, Red.
• D. One hydraulic system: Green.

Answer: (B)

Three independent hydraulic systems power the A320, each with its own pumps and lines to keep critical controls working even if one system is lost. The color designations map to these circuits as Green for the Left system, Yellow for the Center system, and Blue for the Right system. In normal operation, Green and Blue are driven by the left and right engines, respectively, while Yellow is primarily powered by an electric hydraulic pump to provide hydraulic capability even if both engines aren’t supplying power. This is why the correct answer identifies three independent systems with Green (Left), Yellow (Center), and Blue (Right).