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This paper describes the operational capabilities of the Real-Time Vibration Monitoring System (RTVMS) developed by the Marshall Space Flight Center (MSFC) for Space Shuttle Main Engine (SSME) high-speed turbomachinery vibration diagnostics and failure mitigation. RTVMS is now operational at the Stennis Space Center (SSC) during SSME static test firings to provide real-time vibration analysis and health monitoring capabilities during engine operation. The RTVMS produces real-time vibration spectral data from such critical SSME components as the high pressure turbomachinery. From this data, discrete spectral signatures, which are prime indicators of turbomachinery health, can be assessed at high speeds and utilized to mitigate potential catastrophic engine failures. The ability to monitor these potential failure indicators will allow the SSME Program to develop a digital engine health monitoring system based on vibration analysis and, for the first time in the history of the Space Shuttle flight program, activate a vibration flight redline for the engine high pressure turbomachinery