( CNN ) -- Just two months after an engine cracked and failed during test aboard a Boeing 787 , federal plane inspectors have found a second engine problem on a different Dreamliner , the National Transportation Safety Board announced . The NTSB identified the problem as a cracked fan midshaft on a Dreamliner General Electric GEnx-1B turbofan engine , the group said in a written statement posted on its website Thursday . The 787 had not yet flown when investigators identified the engine problem , investigators said . Inspectors uncovered the cracked second engine during an inspection of all in-service engines of that type , the NTSB said . The statement included no further details of the discovery . The NTSB , which investigates all U.S. civil aviation accidents , said its investigation of the engine troubles is continuing . GEnx engines are manufactured at a General Electric facility in Cincinnati . Related : U.S. domestic 787 flights to start in November . The first Dreamliner engine problem occurred on July 28 during a taxi test at Charleston International Airport in South Carolina . No passengers were on board , and no injuries were reported , although burning debris from the failure did cause a small brush fire near the tarmac . Related : Ethiopian Airlines brings 787 to Africa . In a third related development , a similar General Electric engine on a different kind of aircraft -- a GEnx-2B on a Boeing 747 -- lost power during takeoff last September 11 at Shanghai Pudong International Airport . That incident is under investigation by the Civil Aviation Administration of China , the NTSB said . Preliminary findings showed that the failed engine 's fan midshaft on the 747 was `` intact and showed no indications of cracking , '' the NTSB said . The Federal Aviation Administration , General Electric and Boeing are involved in the Chinese investigation . Boeing rolled out the 787 Dreamliner last year , three years late and billions of dollars over budget . United Airlines is scheduled to begin flying the first U.S. domestic routes for the aircraft in November . Related : 787 myths and facts . Fanfare has been loud surrounding the technologically advanced Dreamliner . Among other touted features , it 's the first commercial airliner made mostly of light-weight carbon composites , requiring less fuel than conventional airliners .
Inspectors find second cracked General Electric engine on new 787 airliners . Comment: The engines are made of a very thin metal, and the cracks can be seen by looking at them under an electron microscope ( or even better with your eyes ). A similar engine lost power aboard a Boeing 747 in China earlier this month . High-tech Dreamliner set to begin U.S. domestic routes in November .