This sounds cool

"In the future, a new generation of ultrasound and infrared sensors, built into the engines, could detect structural defects before they present any danger at all. “It would be a paradigm shift, integrating diagnostics and prognostics,” says Kontsos, who is working with military and commercial operators to develop such systems." ~ J. Stewart https://www.wired.com/story/southwest-1380-engine-metal-fatigue/