This month, the Japan Transport Safety Board announced that it had confirmed traces of fatigue damage at the base of broken blades inside the engine regarding the trouble that a passenger plane of Japan Airlines made an emergency landing at Naha Airport due to engine damage. Did.
On the 4th of this month, the Japan Transport Safety Board released a photo of the progress of the investigation and the damaged part due to the trouble of an emergency landing at Naha Airport due to the damage of the engine on the left side of the Boeing 777 aircraft on Japan Airlines flight 904.
According to this, two of the 22 blades called "fan blades" were broken inside the engine, and one of them broke from the root, and traces characteristic of fatigue failure were found at the root, and fatigue It means that it may have broken due to destruction.
The blade immediately next to it broke in the middle and there was no evidence of fatigue failure, so it seems that the cause was that the blade that broke from the root came into contact.
In addition, a photograph showing the damage status of the aircraft was also released.
▽ The engine cover was greatly peeled off, and
▽ There was a hole of about 28 cm in the left horizontal stabilizer.
There may be a bumped part in the hole, but it has not been confirmed yet.
A dent of about 20 cm was found on the same left horizontal stabilizer, and a scratch of about 30 cm was found on the left side of the fuselage as if it had been rubbed with a sharp object.
The Japan Transport Safety Board will continue to investigate the causes of troubles such as the history of fatigue failure.