Which hydraulic system can be used to extend the landing gear if the main system fails?

• A. System 3
• B. System 1
• C. System 2
• D. All three

Answer: (C)

The situation tests how landing gear can be deployed when the main hydraulic system is not available. Aircraft are built with multiple hydraulic sources, and a dedicated backup path is provided so the gear can still be lowered for a safe landing. The backup path in this design is tied to the secondary hydraulic system, which has its own pump and feed lines to the landing gear actuators. That independence lets the crew extend the gear even if the primary system has failed, ensuring a controllable descent and landing. The other systems don’t provide this guaranteed alternate path in this configuration, and having all three capable isn’t how this particular architecture is arranged.