WHILE USING BOOM TRUCK S-68 TO MOVE STEPS AND AFTER WHILE THE BOOM WAS UNHOOKED NOT UN LOAD. THE BOOM FELL FROMT HE TRUCK BOLT METAL FATIGUE EE JUMPED FROM APPROX. THE AREA OF THE TRUCK RUNNIN G BAORD TO AVOID BEING STRUCK BY THE BOOM. IN DOING SO HE STRUCK THE GROUND WITH HIS SHOULDER. FACE AND HAND.