EE WAS HELPING REPOSITION THE BELT TENSIONER STATIONARY ROLLER ASSEMBLY AFTER IT BROKE LOOSE FROM ITS MOUNTING BEAMS. THE ASSEMBLY HAD BEEN STOOD UP AND CREW WAS GETTING READY TO REPOSITION ROPES TO MOVE ASSEMBLY FINAL POSITION. EES WERE BELIVED TO HAVE WENT IN TO MOVE ROPES WHEN THE ASSEMBLY FELL OVER STRIKING THEM.