Worker A (the injured), worker B (a

Worker A (the injured), worker B (assistant leader), and worker C (leader) moved up to the
scaffold G5 filters and started to remove the heater of polymer tubes and an insulating
cover. Worker A took the cover off and put it on the scaffold, but worker B told him to put
the cover on the floor. The worker A held the cover in both hands, he crouched down and
tried to go down from the scaffold (780 mm) backward, stepping back his left foot. In the
moment his foot touched the floor, he slipped and fell on his bottom.