Emergency Brakes are powered by what system?

• A. Auxiliary hydraulic system
• B. Main hydraulic system
• C. Electrical system
• D. Pneumatic system

Answer: (A)

Emergency brakes rely on a separate hydraulic source to ensure braking even if the primary system fails. In many aircraft, there are two independent hydraulic circuits: the main hydraulic system for normal braking and the auxiliary (emergency) hydraulic system that can power the brakes when the main system is unavailable. This separation provides redundancy and the high braking force needed for safe stopping. Electrical power can drive actuators in some designs, but the emergency braking function is typically hydraulic to guarantee sufficient, reliable pressure. Pneumatic systems exist in other contexts, but for emergency aircraft braking, hydraulics are used. So the emergency brakes are powered by the auxiliary hydraulic system.