The loss of hydraulic system ___ will prevent the nose gear from extending, even when using the alternate gear extension procedures.

• A. 1 and 2
• B. 1 and 3
• C. 1, 2 and 3
• D. 2 and 3

Answer: (D)

The nose gear extension requires hydraulic pressure to move the gear actuators, and the alternate extension path still depends on hydraulic power from specific systems. If both hydraulic systems 2 and 3 are lost, there’s no pressure available to drive the nose gear even with the emergency procedure, so the nose gear cannot extend. If only one of those systems were lost, the remaining pressure source could still operate the extension, which is why losing 2 and 3 together uniquely prevents extension.