What is essential for the effective operation of the hydraulic system in helicopters like the TH-73A?

• A. High fluid pressure
• B. Multiple hydraulic sources
• C. Regular fluid maintenance
• D. High-temperature tolerance

Answer: (B)

The effective operation of the hydraulic system in helicopters such as the TH-73A largely depends on having multiple hydraulic sources. This redundancy is crucial for safety and reliability, as it ensures that if one source fails, the others can still provide the necessary pressure and flow to perform essential functions such as flight control, landing gear operation, and other critical hydraulic functions. By having multiple hydraulic sources, the system is designed to maintain functionality under various conditions, thereby enhancing overall resilience and operational capability.

While high fluid pressure, regular fluid maintenance, and high-temperature tolerance are all important aspects of hydraulic systems, they do not provide the same level of safety and redundancy that having multiple sources offers. These other factors support the system's efficiency and longevity but do not directly address the potential need for backup in case of failure.