This was shared in a comment and has more details. - Issue found on 3 test aircraft - During certification tests (ie very late in the game) - Boeing-designed

This was shared in a comment and has more details. - Issue found on 3 test aircraft - During certification tests (ie very late in the game) - Boeing-designed thrust link is cracking (this links engine to wing). Made of titanium. There are two on each engine for redundancy. https://www.seattletimes.com/business/boeing-aerospace/boeing-discovers-engine-part-defect-and-grounds-its-777x-test-airplanes/ https://www.seattletimes.com/business/boeing-aerospace/boein...