Which statement best describes the rotor brake system’s purpose?

• A. To slow rotor during landing
• B. To stop the main rotor as quickly as possible after engine shutdown
• C. To adjust rotor speed during hover
• D. To engage during takeoff

Answer: (B)

The rotor brake is there to stop the main rotor quickly after the engine is shut down. When power is removed, the rotor can keep turning due to inertia and wind, a phenomenon called windmilling. Without a brake, the rotor would slow down gradually, which can cause safety concerns during maintenance, increase wear, and complicate restarting procedures. Engaging the rotor brake brings the rotor to a halt promptly, securing the aircraft for parked or serviced conditions. It isn’t about slowing rotor during landing, adjusting rotor speed in hover, or engaging during takeoff, which are controlled by other flight systems and procedures.