THE INJURED EE WAS TIGHTENING HOUSING BOLTS ON TOP OF THE PRIMARY CRUSHED. HE WAS USING IS FOOT TO PUSH THE WRENCH AND HIS FOOT SLIPPED OFF THE WRENCH AND THE OTHER FOOT SLIPPED OFF THE FRAM. HE FALL 5' & HIT THE DRIVE WHEEL AND THEN FELL 4 1/2' MOR & HIT CATWALK. AS HE FELL HIS LEFT ANKLE HIT THE WHEEL RSULTING IN A FRACTURE, ALSO POSSIBLE HAIRLINE FRACTURE TO RIGHT KNEE.