INJURED STATED THAT HE WAS TAKING THE COVER OFF THE ATRS ON THE #2 UNIT BOLTER TO CHANGE A HOSE,WHEN THE COVER FLEW UP AND HIT INJURED JUST ABOVE THE LT. EYE CAUSING A 3""LACERATION. INJURED WE NT TO THE HOSPITAL AND RECEIVED 3 STITCHES & RETURNED TO WORK THE NEXT SHIFT.