Abstract: The hierarchical distributed knowledge based system functions in a machine initiated maintenance environment to provide efficient and timely maintenance of customer equipment. The hierarchical, distributed knowledge based system provides the failure evaluation function through the use of an expert or knowledge based system that is installed in the customer equipment. The knowledge based system makes use of a set of rules and hypotheses to operate on data collected from various points within the customer equipment to monitor the operational integrity of the customer equipment. This knowledge based system identifies the occurrence of a failure within the customer equipment and functions using its rules, hypotheses and collected data to isolate the source of the error in the customer equipment and, whenever possible, "fence" or isolate the failed field replaceable unit that has caused the error.

Abstract: This failure management system architecture guides, detects, validates and logs field replaceable unit (FRU) changes. This system includes a guided capability by which service personnel use the guided process to select candidates for FRU swaps or FRU replacement. FRU change and swap detection is described as a function of FRU memory scanning coupled with embedded database query activity. For swap activity virtual Composite Failure Events are created to manage post-swap failures. Validation logic determines whether the changed FRU is positioned correctly, is at the correct hardware, software and feature level, executes diagnostics correctly and performs flawlessly during monitored and extended functional operation.