In this hypothetical situation What is the issue of fact? What is the issue of law? and what is the investigation points

Mr. Tinker took his radio-controlled, gas engine. model airplane to the park one day. The plane was flying in the park when the rudder suddenly failed and the plane crashed through the window of a home across the street from the park. The home owner insists that the uncontrolled flight of model airplanes is not allowed at the park, and hasn't been for many years. This is not the first time her property has been damaged by errant model airplanes