MISTRAS-Triple 5s AMS has a specific application for HRSG Heat Recovery Steam Generator (HRSG) tube leak detection. HRSG Online Monitoring with the AMS provides 24-7, real-time data that offers first detection, as well as leak location and trending, capabilities at least two weeks earlier than traditional methods, which fall short because of a HRSGs unique operational challenges, and with hundreds of thousands of dollars in potential savings. By detecting an acoustic change in normal background noise and providing first notification, HRSG Online Monitoring can: secondary damage; manage power market risk; trend leak progression and severity; schedule maintenance vs. forced outage; preplan jobs to maximize efficiency and optimize outage.