What is the name of the system that permits stopping the main rotor as quickly as possible after the engines have been shut down?

• A. Rotor Stop
• B. Rotor Brake
• C. Main Brake
• D. Rotor Clutch

Answer: (B)

The system is designed to stop the rotor quickly once the engines are shut down. After the engines quit, the rotor can continue turning due to wind and air resistance, which can put stress on the drivetrain and create safety risks on the ground. A rotor brake provides immediate braking force to the rotor hub, rapidly decelerating and stopping the rotor. It’s typically actuated hydraulically or electrically and is specifically built for bringing the rotor to a quick halt, unlike other devices that either start the rotor (like a rotor clutch) or relate to ground-wheel braking (main brake) or are not the standard term for stopping the rotor (like rotor stop or rotor clutch).