Abstract: At 11:00 p.m. on February 8, 2017, an employee was mopping the floor at a pump manufacturing facility when he fell into an unguarded maintenance pit. The maintenance pit measured 80 inches by 80 inches and was 86 inches deep. The maintenance pit had a retractable rope stanchion for a warning line that was located at the edge of the maintenance pit. As the employee was walking backwards, mopping the floor, he ran up against the warning line, lost his balance and fell into the pit. The employee sustained a laceration to his head and 5 broken ribs, which he was hospitalized and received treatment.