EE WAS REMOVING A SHAFT ECCENTRIC FROM A DRIVE SPROCKET ON 32 COOLER. HE WAS WORKING OFF A 2X10 PLANK WHICH WAS SPANNING ON 8-10 OPENING. THE EE HAD NO FALL PROTECTION ON.L HE WAS 8' IN THE AIR APPROXIMATELY. WHEN THE ECCENTRIC BROKE FREE OF THE SPROCKET, IT FELL ONTO THE PLANK, BREAKING THE PLANK. THIS RESULTED IN THE EE FALLING. HE LACERATED HIS FACE, THUMB & CRAC