Automatic Tracking Device: When the height of the aircraft varies due to load changes, the boarding bridge automatically tracks the height of the aircraft door so as to keep a position matching with the aircraft door.

• 自动跟踪装置：当飞机由于承载变化使高度发生改变时，登机桥自动跟踪飞机舱门的高度以保持与飞机舱门的相对位置。