Diagnostic evaluation of rocket engine vibration data acquired from high frequency sensors such as accelerometers, strain gauges, proximity probes, and fluctuating pressures. Data from these sensors is acquired at high speeds (10,000 to 100,000 samples/second) allowing for high frequency spectral analysis to be performed on engine/engine components. Time, frequency, and phase domain analyses results are maintained in databases that are utilized to determine engine/engine component health, statistical family comparability, and flight acceptability. NASA Competency Management SystemPage 46