EE WAS CARRYING A CANNISTER OF AFEX POWDER USED FOR FIRE SUPPRESSION ON THE SURFACE FRONT END LOADERS. HE HAD THE CANISTER ON HIS LEFT SHOULDER CARRYING IT AROUND THE LOADER TO ACCESS SIDE. EM PLOYEE TRIPPED OVER A PARTS BOX ON THE FLOOR, AS HE CAME AROUND THE LOADER. THE CANISTER LANDED ON HIS LEFT HAND.