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Since 1986, the U.S. Army has been evaluating a digital data recording system known as a Portable Engine Analyzer Test Set (PEATS) for the detection, diagnosis and prognosis of faults on turbine engines installed in helicopters. On-board use of digital data systems makes test cell quality instrumentation available for testing installed engines. Electronic data recording and transfer of accurate performance information into a personal computer allows the use of Artificial Intelligence methods to form and interpret the significance of the data. The resulting information is being successfully used to provide previously unobtainable diagnostic capabilities for maintenance decisions. Standardized engine testing and formatting of data helps low experience technicians see the relative internal condition of a gas turbine engine at a glance.