Abstract
A new safety based maintenance concept suggested in the paper. Starting from systems statistical safety analysis, considered step by step, it has been denoted that safety analysis in the period operation is performed mainly in situations when accident has never been happened. Using FMECA method was performed initial events screening (exclusion from the list of initial events whose effects are not significant). Benefits of FMECA of excavator unit maintenance enable initial events list reduction for performing the ETA. ETA methodology allows the determination of accident scenarios on the base of initial events, for the excavator unit. One initial event of them represents excavator unit’s disturbance—accident precursor. Safety control chart was created from where determined worst initial event. It is suggested on new safety assess adoption in systems operation stage based on disturbance sequence (accident scenario) modeling.
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