As in conventional ultrasonic TTU inspection, the choice of Airscan® transducer frequency determines the balance of penetrating power vs. lateral resolution. The scan images below illustrate the impact of transducer choice on image quality. The scanned specimen is a section of 0.900" aluminium honeycomb core with 0.015" carbon-fiber face-sheets. Each of these scans were performed at a linear scan velocity of 6ips, with an index of 0.020 inches.