What happened
On July 8, 2011, at 0920 Japan standard time, an All Nippon Airways Co., Ltd. Boeing 767-300, operating as JA8674, was climbing through 9,200 meters approximately 120 miles northwest of Tokyo-Haneda International Airport (HND). During this phase of flight, the crew noted abnormal noises and vibrations originating from the No. 1 (left) engine, which was a General Electric CF6-80C2.
The pilots proceeded to shut down the No. 1 engine and declared an emergency. The aircraft subsequently returned to land at HND. There were no injuries among the 255 people on board.
The investigation
A post-flight borescope examination of the No. 1 engine was conducted, which revealed serious damage to the turbine blades.