A trend analysis study performed on the problem reports (PRs)recorded during the US Space Shuttle 26R payload processing cycle atKennedy Space Center is described. The study used defect flow analysis(DFA), which views the PRs as a population of events, and focuses onways to understand the characteristics of the population as a wholerather than that of any one individual PR. The 26R payload was thetracking and data relay satellite (TDRS) and an associated inertialupper stage propulsion module. There were 344 PRs written on the flightand ground support equipment, of which 287 were reviewed and, via acriticality screening process, 112 were diagnosed in detail. These 112PRs provide the basis for the analysis and findings reported
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