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ASN Wikibase Occurrence # 211389
Last updated: 26 September 2021
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Date:24-MAY-2018
Time:c. 15:55 LT
Type:Silhouette image of generic B763 model; specific model in this crash may look slightly different
Boeing 767-346
Owner/operator:Japan Airlines
Registration: JA8980
MSN: 28837/673
Fatalities:Fatalities: 0 / Occupants: 217
Other fatalities:0
Aircraft damage: Minor
Category:Serious incident
Location:Mashiki town, Kumamoto prefecture -   Japan
Phase: Initial climb
Nature:Passenger - Scheduled
Departure airport:Kumamoto Airport (KMJ/RJFT)
Destination airport:Tokyo-Haneda Airport (HND/RJTT)
Investigating agency: JTSB
Narrative:
About three minutes after take-off from runway 07 of Kumamoto Airport at 15:52 LT and at 6000 feet AGL, Left (No.1) engine (GE CF6-80C2B4F) of a Boeing 767-346 of Japan Airlines flight JAL/JL632 to Tokyo/Haneda suffered high EGT (about 900C, compared to the normal 800C of the right engine) with heavy vibration, and spread numerous small pieces of metal over Mashiki town. A window glass of a hospital, a parked car and three more damages on the ground were reported. No personal injuries were reported. The plane returned to Kumamoto at 16:17 LT with the right throttle being idle. Damaged turbine blades of the Left engine, as well as a 9cm long hole of the nacelle, were found after landing. Several black spots were also observed at the leading edge of the left horizontal stabilizer. Traces of the bird strike were not found. 98 pieces of debris were collected in total as of the next day. The troubled engine has experienced about 70 thousands of flight time and 33 thousands of flight cycles since acquisition in 1993. Recent overhaul had performed in November 2017, and the low-pressure turbines had been overhauled in November 2015.

CAUSE:
It is highly probable that this serious incident was caused by the fractured blade #13 on HPT (high pressure turbine) stage 2 of No. 1 engine (left side), when the Aircraft was climbing, that damaged blades and stator vanes of aft stages, fragments of which collided with LPT (low pressure turbine) casing and generated a hole (crack).
It is highly probable that the fractured blade #13 was caused by cracks that were generated on TA (Turning Around (branching and turning around of cooling air flowing inside blades)) area and progressed thereafter.
It is somewhat likely that cracks generated on TA area were caused by hot corrosion swelling (blister) generated on the coating layer of the blades and low-cycle fatigue initiating from the cracks

Sources:

https://headlines.yahoo.co.jp/hl?a=20180524-00000086-asahi-soci
https://headlines.yahoo.co.jp/hl?a=20180524-00000118-jij-soci
https://www3.nhk.or.jp/news/html/20180524/k10011451231000.html?utm_int=news-social_contents_list-items_004
https://headlines.yahoo.co.jp/hl?a=20180525-00000030-mai-soci
https://headlines.yahoo.co.jp/hl?a=20180525-00000030-asahi-soci
https://headlines.yahoo.co.jp/hl?a=20180525-00010010-nishinpc-soci
https://headlines.yahoo.co.jp/hl?a=20180525-00000126-jij-soci
https://headlines.yahoo.co.jp/hl?a=20180525-00000003-awire-soci
https://www.jal.co.jp/en/info/dom/180525.html
http://jtsb.mlit.go.jp/jtsb/aircraft/detail2.php?id=2213

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


Images:

Photo of JA8980 courtesy AirHistory.net


Tokyo - Haneda International (RJTT / HND)
20 March 2017; (c) Anton Homma


Photo: JTSB

Revision history:

Date/timeContributorUpdates
24-May-2018 13:21 isamuel Added
24-May-2018 17:26 Anon. Updated [Narrative]
25-May-2018 14:26 isamuel Updated [Source, Narrative]
25-May-2018 14:27 harro Updated [Source]
25-May-2018 15:51 isamuel Updated [Source, Narrative]
26-May-2018 07:36 isamuel Updated [Time, Source, Narrative]
30-Jul-2020 17:42 harro Updated [Destination airport, Narrative, Photo, Accident report, ]
01-Aug-2020 08:13 harro Updated [Narrative, Accident report, ]

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