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ASN Wikibase Occurrence # 162752
Last updated: 13 December 2017
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Date:13-DEC-2013
Time:08:45 JST
Type:Silhouette image of generic B772 model; specific model in this crash may look slightly different
Boeing 777-281
Owner/operator:All Nippon Airways
Registration: JA701A
C/n / msn: 27938
Fatalities:Fatalities: 0 / Occupants: 365
Other fatalities:0
Airplane damage: Minor
Location:over Iida city, Nagano prefecture (about 110km west of Tokyo Int'l air -   Japan
Phase: En route
Nature:Domestic Scheduled Passenger
Departure airport:Tokyo international airport (RJTT/HND)
Destination airport:Fukuoka airport (RJFF/FUK)
Narrative:
While climbing up FL400 of cruising altitude after liftoff, at an altitude of approximately 32,600 ft,the flight instrument indicated the engine thrust decrease of the No.2 Engine (the right engine; hereinafter referred to as “the Engine”) and an increase in its exhaust gas temperature (EGT). Accordingly, it was shut down, and then Flight NH243 returned to Tokyo International Airport and landed at 09:15 after obtaining a priority in the air traffic control.

PROBABLE CAUSES
It is highly probable that the serious incident occurred because the engine interior was damaged due to the damage of the blades around the entire periphery of the first stage disc of HPC (stage 5) of the No.2 Engine (the right engine) during the flight.
With regard to the damage of the blades around the entire periphery of the first stage disc of HPC, it is somewhat likely that one of the blades was damaged at the dovetail part and fell off from the slot.

Sources:

http://www.mlit.go.jp/jtsb/eng-air_report/JA701A.pdf

Accident investigation:
cover
Investigating agency: JTSB
Status: Investigation completed
Duration: 1 year and 11 months
Accident number: AI2015-7
Download report: Final report

Revision history:

Date/timeContributorUpdates
16-Dec-2013 14:48 isamuel Added
30-Oct-2015 00:01 harro Updated [Operator, Other fatalities, Phase, Nature, Source, Narrative]

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