Explain the purpose of the UH-60 rotor brake and when it should be used.

• A. It mechanically stops the main rotor to secure the helicopter after shutdown; use after engine shutdown and rotor is stationary, not during operation.
• B. Used to adjust rotor speed during flight.
• C. Used to start the engine.
• D. It is decorative; no function.

Answer: (A)

The rotor brake is a safety device that locks the main rotor to prevent windmilling and rotor movement when the helicopter is parked. Its purpose is to secure the rotor after shutdown, making maintenance and inspections safer and protecting the drivetrain from wind gusts or unexpected movement.

It should be used after the engine has been shut down and the rotor has come to a complete stop. Engaging it while the rotor is turning or while the helicopter is in operation is not appropriate and can damage the drivetrain. The rotor brake is not used to start the engine, nor is it decorative.