Fine-tuning mechanism of passenger boarding ladder consists of diagonal strut, up/down brackets, roller components and fine-tuning and other components of the oil cylinder, wheel installed on the top of the telescopic bracket on both sides. When the docking height between the boarding platform of the passenger ladder car and the aircraft door is different, the fine-tuning cylinder working telescopic bracket will raise the ladder platform, so that the boarding platform of the passenger ladder car and the height of the aircraft door are the same.
Passenger boarding ladder prop gear assembly is the main function of stability on the up and down movement of ladder assembly, at the same time can be effective against the ladder assembly of mechanical lock. The roller assembly at the front end of the tooth is installed in the track of the upper ladder assembly, and the rear end is fixed on the lower ladder assembly. When the upper ladder assembly is stretched back and forth, the tooth assembly also moves with the upper ladder assembly.