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Proper reliability and maintenance best practice processes have a direct impact on equipment availability, throughput capacity, and spare inventories. The purpose of the time-to-failure estimation (TTFE) technique is to provide a tool for engineers and technicians for risk-based reporting of condition- based maintenance tests and inspections. Through the proper application of this technique, corrective action may be prioritized improving the effectiveness of the maintenance program. Instead of stakeholders being required to make decisions based upon experience only, equipment failure, and repair history can be used to enhance the process, improving the availability of critical equipment.