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Why does a system's Mean Time To Repair (MTTR) depends on both the reliability and maintainability of its subsystems?
• Reliability indicates how long repairs will take on a given subsystem
• Maintainability is a reciprocal of reliability, and therefore mathematically dependent upon it
• The MTTR is function of the reliability and maintainability characteristics of each subsystem
• Maintainability is the sum of the mean time between failure and mean time to repair parameters