This Small Business Innovation Research Phase I project is to develop, fabricate, and characterize a novel frequency steered acoustic transducer (FSAT) for the structural health monitoring of aerospace structures for impacts, damage, and leakage. A single compact, cost effective FSAT is expected to replace high-element-count phase arrays, significantly reducing cost, weight, size, and power requirements for multiple channel data handling, wiring, electronics, and powering. FSAT will allow for permanent continuous leakage detection and localization of simple and complex structures.