Hydraulic System B powers which brakes?

• A. Inboard brakes
• B. Outboard brakes
• C. Both inboard and outboard brakes
• D. Nose wheel brakes only

Answer: (B)

Brake power is organized with two hydraulic circuits for redundancy, and each circuit feeds a different brake set. System B specifically supplies the outboard brakes on the main landing gear. This separation means you still have braking capability if one system fails—the other system continues to operate its assigned brakes. In this case, the inboard brakes would be powered by the other hydraulic circuit, so you maintain braking, albeit with a different distribution, if System B isn’t available. This split helps ensure safe braking performance even in the event of hydraulic trouble.