How does a dual hydraulic system for landing gear improve safety?

• A. Redundancy allows gear to extend/retract if one system fails, reducing single-point failure risk.
• B. It doubles weight but has no safety benefit.
• C. It allows only braking to function.
• D. It simplifies maintenance but reduces reliability.

Answer: (A)

Redundancy in landing gear hydraulics means two independent hydraulic circuits can power the gear extension and retraction. If one circuit fails—whether from a pump issue, a leak, or a valve fault—the other circuit can still operate the gear, ensuring the gear can be extended for landing or retracted safely. This built-in backup reduces the risk of a single-point failure leaving the gear stuck or causing a gear-up condition during critical phases of flight. The safety advantage comes from having a second, independent path to move the gear, not from any effect on braking itself.

The other ideas don’t fit because simply having two systems doesn’t imply only braking would work, and redundancy is generally aimed at improving reliability and safety rather than reducing it. While adding a second hydraulic circuit adds weight, the primary benefit is the significantly lower risk of gear failure. Maintenance complexity might increase, but it does not negate the reliability gain from having a backup system.