FAA 2023–06–14

Requires replacing all combustion chamber outer case (CCOC) flange bolts and modifying the CCOC and inner bypass ducts. This AD also prohibits the installation of certain flange bolts on any affected engine, as specified in a Transport Canada AD. This AD is prompted by a manufacturer's design review, which identified that the CCOC to rear compressor case flange bolt low cycle fatigue life was inadequate and that those flange bolts may develop cracks resulting in flange bolt fracture.