Serious incident Boeing 777-346ER JA743J,
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ASN Wikibase Occurrence # 199386
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Date:Tuesday 5 September 2017
Time:11:00 LT
Type:Silhouette image of generic B77W model; specific model in this crash may look slightly different    
Boeing 777-346ER
Owner/operator:Japan Airlines
Registration: JA743J
MSN: 36130/821
Year of manufacture:2009
Fatalities:Fatalities: 0 / Occupants: 251
Aircraft damage: Minor
Category:Serious incident
Location:Tokyo International Airport/Haneda (HND/RJTT) -   Japan
Phase: Take off
Nature:Passenger - Scheduled
Departure airport:Tokyo International Airport /Haneda (HND/RJTT), Japan
Destination airport:New York/John F. Kennedy International Airport (JFK/KJFK), USA
Investigating agency: JTSB
Confidence Rating: Accident investigation report completed and information captured
Japan Airlines flight JAL/JL6 from Tokyo/Haneda, Japan to New York/John F. Kennedy, a Boeing 777-346ER, was forced to return to Haneda due to the No.1 engine (GE90-115B) fire during takeoff from runway 34R. Tower controller observed fire erupted from the engine, and some small areas of grass at the left side of the runway were burned. The pilot also noticed abnormal engine indications during takeoff roll and initial climb.
The runway 34R was closed until 12:47 LT. The troubled B777 landed safely on the runway 34L at 12:09 LT after one hour of hold to dump/burn fuel with the No.1 engine shut down and proceeded to spot 908.
All of 112 5th stage low-pressure turbine blades and most of 110 6th stage (most rear) ones were broken, bent or damaged, while the fan blades were undamaged. There was a hole (4cm x 0.5cm) at the lower side of the turbine gear flame. The left wing and pylon also suffered partial damage by debris. The troubled engine was attached to the plane in February 2014, and was used for 16289 flight hours. There were no reported injuries.

It is highly probable that the serious incident was caused by collisions of some of fragments with turbine rear frame (TRF), which led to generating the hole due to damage to multiple stages of stator vanes and turbine blades of low pressure turbine (LPT) of No. 1 (left side) engine immediately after take-off.
It is highly probable that damage to multiple stages of stator vanes and turbine blades of low pressure turbine was contributed by the fracture of one of LPT fifth stage stator vanes. It is highly probable that the fracture of one of LPT fifth stage stator vanes was contributed by the crack generated by stress concentration caused by arch-binding, which progressed to the fracture by repetitive stress associated with engine operation.

Accident investigation:
Investigating agency: JTSB
Report number: 
Status: Investigation completed
Duration: 2 years and 2 months
Download report: Final report



Revision history:

05-Sep-2017 05:06 isamuel Added
05-Sep-2017 05:23 harro Updated [Embed code]
05-Sep-2017 06:39 isamuel Updated [Total occupants, Source, Embed code, Narrative]
05-Sep-2017 12:18 isamuel Updated [Source, Narrative]
06-Sep-2017 05:16 isamuel Updated [Total occupants, Source, Narrative]
06-Sep-2017 06:41 isamuel Updated [Source, Narrative]
06-Sep-2017 13:26 isamuel Updated [Source, Narrative]
07-Sep-2017 05:17 isamuel Updated [Source, Narrative]
10-Sep-2017 08:04 harro Updated [Source]
01-Dec-2019 15:20 harro Updated [Narrative, Accident report, ]

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