Abstract: At about 3:00 p.m. on October 23, 1991, Employee #1 was a member of a four man maintenance crew assigned to shorten the wire ropes on a National Park's elevators and counterweights. While working on the counterweight of elevator #4, the crew found it necessary to go up to the machine room to release additional wire rope from the drum so that the fastenings would reach the counterweight. Three of the employees went up to the machine room in elevator #3 while Employee #1 was left standing between the counterweight compartment and elevator #3 in the shaft's pit. When the mechanics reached the top floor, the counterweight for elevator #3 reached the pit area, striking and crushing Employee #1. He died.