If HYD 2 LO PRESS is displayed along with loss HYD SYS 3, which problem will be encountered?

• A. Nose gear will not extend during Landing Gear Manual Extension; nose wheel steering will be inoperative
• B. Nose gear will extend normally; nose wheel steering will be operative
• C. Nose gear will extend but MLG down lock may not engage
• D. There will be no impact on gear operations

Answer: (A)

Hydraulic pressure and system redundancy power both the landing gear actuators and the nose wheel steering. When HYD 2 has low pressure and HYD SYS 3 is lost, the hydraulic sources that normally drive the nose gear extension and the steering actuators aren’t available in full. In a manual gear extension, the nose gear still relies on hydraulic pressure to move into place and lock properly. With insufficient pressure from HYD 2 and no pressure from HYD SYS 3, the nose gear cannot extend, and the nose wheel steering loses its hydraulic power, rendering it inoperative. That combination of failures directly leads to the nose gear not extending during manual extension and the nose wheel steering being inoperative.