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Event tree analysis is an inductive method, which involves determining the events flowing from the failure of a component or part of the system. Starting from an initiator event or an origin failure, the event tree analysis allows the estimation of system deviation, taking into account in a systematic manner the functioning or failure of detection devices, alarm, prevention, protection or intervention. This paper follows the steps in determining the causes that led to a work accident through the Event Tree Analysis method. The construction of event tree analysis consists of graphical representation of operations which through a succession of decisions lead to an accident during maintenance of work equipment.