What holds the Main Landing Gear in the retracted position?

What holds the Main Landing Gear in the retracted position?

• A. Mechanical up locks and hydraulic system 3 pressure
• B. Nose gear lock
• C. Hydraulic lock
• D. Electronic lock

Answer: (A)

Holding the Main Landing Gear in the retracted position is done by a combination of a positive mechanical latch and hydraulic pressure. When the gear retracts, mechanical up locks engage to provide a solid, physical stop that prevents the gear from rotating back down. At the same time, hydraulic pressure from system 3 acts on the gear actuators to keep the gear firmly in the up position and resist any forces that might try to extend it. This dual arrangement—uplocks plus hydraulic hold—ensures the gear stays stowed through flight loads and any minor hydraulic pressure variations. The nose gear lock is for the nose gear, and a hydraulic or electronic lock alone wouldn’t provide the same secure retention without the mechanical uplocks.

Holding the Main Landing Gear in the retracted position is done by a combination of a positive mechanical latch and hydraulic pressure. When the gear retracts, mechanical up locks engage to provide a solid, physical stop that prevents the gear from rotating back down. At the same time, hydraulic pressure from system 3 acts on the gear actuators to keep the gear firmly in the up position and resist any forces that might try to extend it. This dual arrangement—uplocks plus hydraulic hold—ensures the gear stays stowed through flight loads and any minor hydraulic pressure variations. The nose gear lock is for the nose gear, and a hydraulic or electronic lock alone wouldn’t provide the same secure retention without the mechanical uplocks.