On four occasions , the NTSB said , a rotor imbalance caused rotor disks to fail , leading to the uncontained engine failures . Engines on one jet aircraft overseas failed during last August . General Electric CF6-45/50 issues an `` urgent '' recommendation to increase inspections of the engines on U.S. aircraft . At issue are NTSB series jet engines , found on a small number of jets . A General Electric CF6-45/50 spokeswoman says most of the engines are used on cargo planes .
Engines on one jet aircraft overseas failed during last August . General Electric CF6-45/50 issues an `` urgent '' recommendation to increase inspections of the engines on U.S. aircraft . At issue are NTSB series jet engines , found on a small number of jets . A General Electric CF6-45/50 spokeswoman says most of the engines are used on cargo planes .