jon.pierre: I can only guess here, but if there is a mechanical reason then it may be if you are in a turn then one side will be higher. If the turn is balanced there will still be a downward force acting on the U/C but at different angles than if the A/C is level.
Because of this (have not been near a 210 for a while) one side may be suseptible to hanging up if a side loading is present?