Aircraft engine maintenance errors recorded during commercial revenue operation (field operation) share common causes and outcomes as those documented in original equipment manufacturer (OEM) and maintenance repair and overhaul (MRO) facilities. Utilizing data from one or more one of these sources can increase the understanding of skill-based, decision and perceptual errors occurring during assembly, operation and maintenance. The null hypothesis in this descriptive, explanatory research is: the nominal human error probability of removing and replacing a specified line replaceable unit (LRU)/component in field operations and OEM/MRO is the same. Quantitative analysis will include probabilities of human error for specific processes in both field operations and MRO/OEM environments determined by the Human Error Assessment and Reduction Technique (HEART). Qualitative analysis will include the classification of past errors utilizing the Human Factors Classification and Analysis System (HFACS). Accounting for all available types of data enables more precise and appropriate corrective actions.
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