Nosewheel steering hydraulic pressure is provided by which color-coded system when the nose gear doors are closed?

Nosewheel steering hydraulic pressure is provided by which color-coded system when the nose gear doors are closed?

• A. Green
• B. Yellow
• C. Blue
• D. Red

Answer: (B)

The nose wheel steering on the A320 is powered by color‑coded hydraulic circuits, and the source changes with the nose gear door position. When the nose gear doors are closed, the steering actuator is supplied by the Yellow hydraulic system. This arrangement keeps steering pressure independent from other gear functions that are handled by the Green system, providing a reliable, redundant path for steering when the gear is stowed. The Blue system handles other actuators, and Red isn’t used for this function, so Yellow is the appropriate source in this condition.

The nose wheel steering on the A320 is powered by color‑coded hydraulic circuits, and the source changes with the nose gear door position. When the nose gear doors are closed, the steering actuator is supplied by the Yellow hydraulic system. This arrangement keeps steering pressure independent from other gear functions that are handled by the Green system, providing a reliable, redundant path for steering when the gear is stowed. The Blue system handles other actuators, and Red isn’t used for this function, so Yellow is the appropriate source in this condition.