What powers the rotor brake system in the TH-73A?

• A. The No. 2 hydraulic system
• B. A dedicated reservoir and pump
• C. The No. 1 hydraulic system
• D. The tail rotor hydraulic system

Answer: (B)

The rotor brake system in the TH-73A is powered by a dedicated reservoir and pump. This design choice is significant as it ensures that the rotor brake system operates independently of the primary hydraulic systems used for other flight controls. By having a dedicated reservoir, the rotor brake can maintain optimal pressure and functionality without being affected by the operations of the No. 1 and No. 2 hydraulic systems, which are responsible for different flight control mechanisms. This reliability is crucial for safety and performance, allowing the rotor brake to engage and disengage effectively when needed, particularly during landing and ground operations.

Utilizing a dedicated system minimizes the risk associated with failures in the main hydraulic systems, ensuring that pilots have a reliable method for managing rotor speed during ground operations. Thus, the choice of a dedicated reservoir and pump is an important factor in the operational integrity of the rotor brake system.