What is the main purpose of the rotor brake?

• A. Rapidly decelerate the rotor system after engine shutdown
• B. Increase the amount of torque reaching the rotor head
• C. Help the aircraft slow down when on final approach
• D. Shorten sliding landing distance

Answer: (A)

The main purpose of the rotor brake is to rapidly decelerate the rotor system after engine shutdown. This function is essential for ensuring safety and efficiency during the aircraft's post-flight procedures. When the engine is turned off, the rotor blades may continue to spin due to momentum, potentially leading to accidents if someone were to approach the blades or if maintenance is required. By effectively applying the rotor brake, the pilot can bring the rotor system to a complete stop in a controlled manner, minimizing any risks associated with moving blades and facilitating smooth ground operations.

The other options present scenarios that do not align with the primary function of the rotor brake, as they reference different operational aspects of the helicopter. The rotor brake's design and purpose focus specifically on controlling rotor speed after engine shutdown, thereby enhancing safety during ground handling and maintenance.