Nikko Aircraft Caused by fire Fracture from metal fatigue Transportation Safety Commission October 31 11:30
A Japanese aircraft from Ototoshi Haneda to New York fired from the left engine immediately after takeoff and had an emergency landing, and the Transportation Safety Board said that some of the parts inside the engine broke due to metal fatigue. I compiled a report of the cause.
Ototoshi, 6 Japanese Airlines flights from Haneda to New York, Boeing 777 made a fire from the left engine immediately after takeoff, and about 1 hour later, we made an emergency landing at Haneda Airport.
According to the investigation report published by the Transportation Safety Committee, it is pointed out that one metal blade inside the engine was broken due to metal fatigue.
The ruptured blades were more susceptible to metal fatigue due to a condition called “arch binding” in which the parts were brought into close contact with each other and their movement was restricted.
On the other hand, an American manufacturer that produced an engine had a similar problem during an in-house test conducted four years before the trouble occurred, and the manufacturer manufactured a part with a changed design.
However, it was not asking the airline to urgently replace parts.
In Japan Airlines, cracks were found in the same part of the other two engines after the trouble, and the Transportation Safety Committee may replace and repair the internal parts of the engine and repeatedly check it as a preventive measure. It is desirable.