Identification and Evaluation of Human Errors of Operator of Digger Cabin in Drilling Rig Using the SHERPA Technique

in many occupational environments, the occurrence of a human error can  lead to a catastrophic incident that human errors are the main cause of accidents, The current research was conducted to Identification and evaluation of human errors of operator of digger. The main duties and responsibilities of the operator of the cockpit operator were determined based on the HTA (Hierarchy Analysis) method, which included 4 main tasks and 29 s Sub-tasks.  Then, the SHERPA method was used to identify the human errors associated with the operator's Sub-tasks. Number of 76 of human error was identified and evaluated. 38 Human error related to Inspection Sub-tasks, 20 cases of   Operation section, 12 cases in the reporting section and there were 6 human errors in the Shift shifting section. Based on the results of this study, 12human errors at an unacceptable level, 26 errors at undesirable levels, 34 at acceptable level with revision, and 2 at acceptable level without revision. The results of the research showed that conducting activities such as conversations with mobile phones at the time of controlling the thread in the well, the most important human error is for the operator that high probability of occurrence of this error has led to this priority number of risk. In general, the results of the research showed that the SHERPA technique could be used as an effective and useful way to study human errors in oil industry control rooms such as the drill cabin.