Aircraft Landing Gear Systems Practice Test

Reliability comes from redundancy and careful pressure distribution so every actuator can be fed even if one path has an issue. In multi-actuator gear systems, two or more hydraulic circuits are provided with crossfeed lines and smart valve logic. The crossfeed allows pressure to be shared between circuits, so if one line or path leaks or a valve traps pressure, the other circuit can still supply the remaining actuators. Valve logic—sequencing, check valves, isolation valves, and pressure regulators—controls which actuators are pressurized, prevents backflow, and ensures the gear extends, retracts, and locks in the proper order with the right hold pressure. This setup also enables quick shutdowns and safe hold scenarios, while components like accumulators smooth pressure spikes and maintain hold during transient demands. The other options fall short because a single isolated circuit is vulnerable to a single failure, pneumatic power lacks the necessary force and control for gear operations, and manual hand pumps aren’t practical for synchronized, reliable actuation.