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COPYRIGHT 2005 U.S. Navy Safety Center
It all started like any usual Monday morning for three lifting and handling employees. Mechanical equipment specialist Larry Cahoon and electrical equipment specialists Lisa Tholen and Ralph LaClair had to do an annual inspection on jib crane No. 156. This type of crane has horizontal arms, on which trolleys move, bearing the load--nothing new for the employees. In fact, the task had become such a basic practice it seemed like they had nothing to look out for at first.
When the three arrived at the job site, they completed an operational check of the crane before lowering its hook so Cahoon could inspect it and the chain. While he was doing this inspection, Tholen and LaClair deenergized the main-power disconnect and installed both the group-lockout device and their individual safety locks on the crane-door latch. These actions secured power to the crane.
There was just one problem: They should have installed the group-lockout device on the locking mechanism for the disconnect handle, instead of the door latch. They compounded that problem by not doing an initial voltage check, known as a frisk, to...
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