Normal landing gear extension and retraction is provided by which hydraulic system?

Normal landing gear extension and retraction is provided by which hydraulic system?

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

Answer: (A)

The main idea is that landing gear operation in normal conditions is powered by the Green hydraulic system. This system is the primary source of hydraulic power for the landing gear actuators and the associated gear doors, so extending and retracting the gear is carried out reliably through Green. The Yellow and Blue systems are allocated to other actuators and controls on the airplane, not to the normal landing gear actuation, which is why they aren’t used for gear extension or retraction in normal operation. Keeping gear motion tied to the Green system also helps ensure consistent performance across flight regimes and provides a clear, dedicated path for gear actuation even if other hydraulic systems are in use or degraded.

The main idea is that landing gear operation in normal conditions is powered by the Green hydraulic system. This system is the primary source of hydraulic power for the landing gear actuators and the associated gear doors, so extending and retracting the gear is carried out reliably through Green. The Yellow and Blue systems are allocated to other actuators and controls on the airplane, not to the normal landing gear actuation, which is why they aren’t used for gear extension or retraction in normal operation. Keeping gear motion tied to the Green system also helps ensure consistent performance across flight regimes and provides a clear, dedicated path for gear actuation even if other hydraulic systems are in use or degraded.