What effect will the loss of both #2 and #3 hydraulic systems have on the landing gear?

• A. Nose gear can still be lowered.
• B. Nose gear cannot be lowered—no pressure available to release it from the uplock.
• C. All landing gear becomes unreliable.
• D. Brake system is unaffected.

Answer: (B)

The test hinges on how the nose landing gear is released and extended. The nose gear is held in the uplock position and only unlocks when hydraulic pressure is applied to release the uplock and push the leg down. If both hydraulic systems that provide that release pressure fail, there’s no pressure available to unlock the uplock. Without unlocking the uplock, the nose gear cannot extend, so it cannot be lowered. The brake system and other landing gear components may rely on other hydraulic sources, but this particular failure blocks nose gear deployment because the uplock won’t release.