How many engine driven hydraulic pumps are there per system?

The correct answer is that there are two engine-driven hydraulic pumps per system in the C-17 aircraft. Each of the hydraulic systems has its own dedicated hydraulic pump that is driven by an engine. This redundancy is crucial for ensuring reliability and maintaining hydraulic pressure, which is vital for flight control surfaces, landing gear, and other essential systems.

Having two engine-driven hydraulic pumps per system allows for continued operation and control even if one pump were to fail. This design enhances the safety and operational capability of the aircraft, ensuring that critical hydraulic functions remain operational during various flight conditions. The two-pump configuration also helps to balance the hydraulic load, providing better performance and efficiency.

Understanding this configuration is essential for pilots, as it relates directly to operational procedures, emergency protocols, and the overall maintenance and management of the aircraft’s hydraulic systems.