How many independent hydraulic systems provide power?

• A. Two independent
• B. Three dependent
• C. One independent
• D. Three independent

Answer: (D)

Redundancy through separate hydraulic loops is what this question tests. On GoJet aircraft, there are three independent hydraulic systems that provide power. Each system has its own pump (and usually its own reservoir) and powers different actuators for the flight controls and other systems. Because they’re independent, a failure in one system doesn’t disable the others, helping preserve control of the aircraft.

That’s why three independent hydraulic systems is the best answer. The other options either imply less redundancy, or suggest the systems share power (dependent), which isn’t how the hydraulic architecture is designed.