THE EE WAS USING A CHAIN WRENCH TO HOLD THE #3 FAN FROM ROTATING, WHILE A SHEAVE ALIGNMENT WAS PERFORMED AND HEAT SLINGER INSTALLED. WHILE REMOVING THE WRENCH THE BACK FLOW PRESSURE FROM THE C OOLER CAUSED THE FAN TO ROTATE AND THE WRENCH PINCHED THE EE'S FINGER BETWEEN THE WRENCH HANDLE AND FAN BASE.