I experienced such failure on a plane I was flying (CFM56). I don't remember what the exact problem was, but it had something to do with a batch of materials th

I experienced such failure on a plane I was flying (CFM56). I don't remember what the exact problem was, but it had something to do with a batch of materials they used in the construction of some blades. A whole lot had to be replaced. It was my 138th hour flying as capt. This is a new engine, without figuring what causes those fractures, NTBS should ground them. I bet they already know what it is. My father (37 year of flying) always tell me stories where engines in the industry had vibration resonance problems that caused fractures in the whole airplane those engines never ended up flying.