WHILE HELPING TO REPR. THE FINAL DRIVE ONT HE 245 CAT EXCAVATOR 393 RICH STEPPED FROM THE COUNTER WEIGHT TO THE CATWALK. SLIPPING ON SOME ICE AND FELL TO THE GROUND. HE FELL APPROX. 5 FT. LAND ING ON HIS BACK. IT WAS SNOW COVER, SOME ICE ANDFROZEN MUD.