To avoid damage to the AOA sensor on Boeing 787 aircraft, for example, it is necessary to create a certain amount of free space in the area of the passenger boarding bridge's floor bumper.
The Hübner hinged bumper makes it possible to have a larger (and safer) distance between sensitive sensor equipment located in the airplane fuselage and the floor bumper of the passenger boarding bridge. This gives more clearance during docking and reduces the risk of damage.