Korean B773 over Pacific on Jul 2nd 2013, engine shut down in flight
Last Update: May 15, 2014 / 20:05:23 GMT/Zulu time
Incident Facts
Date of incident
Jul 2, 2013
Classification
Incident
Airline
Korean Airlines
Flight number
KE-38
Departure
Chicago, United States
Destination
Seoul, South Korea
Aircraft Registration
HL8275
Aircraft Type
Boeing 777-300
ICAO Type Designator
B773
A replacement Boeing 747-400 registration HL7491 was dispatched from Seoul to Anadyr as flight KE-3037 and landed in Anadyr about 10 hours after landing of HL8275. The Boeing 747-400 boarded the passengers and reached Seoul with a delay of 15 hours.
Rosaviatsia reported the left hand engine had failed, there were traces of oil on the engine cowl. The replacement Boeing 747-400 carried a repair team and spare parts from Seoul to Anadyr and took the passengers to Seoul on its return.
The incident aircraft was able to position to Seoul on Jul 6th.
On May 6th 2014 the NTSB released a preliminary report stating the aircraft was crossing the Bering Sea when the left hand engine was shut down in flight prompting the crew to divert to Anadyr for a safe single engine landing. A post landing inspection revealed the transfer gear box (TGB) housing was fractured and the internal gears were damaged. The engine was removed and sent for examination, the TGB was examined revealing a separated radial bevel gearshaft. Metallurgic examination of the gearshaft revealed fatigue cracks resulting from torsional/biaxial stress. Analysis concluded that the stress was the result of de-carbonization of the gearshaft area, which was not to be hardened by design during the manufacturing process and had received a copper plate to prevent hardening and de-carbonization during the hardening process, due to an insufficient copper plate identifying a manufacturing process deficiency.
As result of of the discovery deficiency four service bulletins were issued by the engine manufacturer, the FAA issued two emergency airworthiness directives plus an additional airworthiness directive. According to the engine manufacturer all suspect gear shafts have since been removed from service.
On May 15th 2014 the NTSB released their final report concluding the probable cause of the incident was:
The failure of the transfer gearbox resulting from the fracture and separation of the radial gearshaft from fatigue cracking as a result of a combination of high residual tensile stresses produced by local decarburization during the manufacturing process coupled with the normal operating stresses.
Incident Facts
Date of incident
Jul 2, 2013
Classification
Incident
Airline
Korean Airlines
Flight number
KE-38
Departure
Chicago, United States
Destination
Seoul, South Korea
Aircraft Registration
HL8275
Aircraft Type
Boeing 777-300
ICAO Type Designator
B773
This article is published under license from Avherald.com. © of text by Avherald.com.
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