ANA B772 near Tokyo on Dec 13th 2013, engine shut down in flight
Last Update: November 3, 2015 / 15:33:00 GMT/Zulu time
Incident Facts
Date of incident
Dec 13, 2013
Classification
Incident
Airline
ANA All Nippon Airways
Flight number
NH-243
Departure
Tokyo Haneda, Japan
Destination
Fukuoka, Japan
Aircraft Registration
JA701A
Aircraft Type
Boeing 777-200
ICAO Type Designator
B772
A replacement Boeing 777-200 registration JA712A reached Fukuoka with a delay of 3:20 hours.
The airline reported a blade in the 5th stage of the high pressure compressor had failed causing damage downstream.
Japan's Transportation Safety Board (JTSB) rated the occurrense a serious incident and opened an investigation.
On Oct 29th 2015 the JTSB released their final report concluding the probable cause of the serious incident was:
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.
The JTSB wrote that the blades of the 6th and last stage low pressure compressor showed nicks and dents at their leading edges, the blades of first stage of the high pressure compressor were severly damaged with all blades either fractured at the airfoil root or missing from their slots, the same applies for the 2nd stage of the high pressure compressor. The damage in the first high pressure compressor stages caused abnormal combustion.
The JTSB analysed that the slots of all but one blades of the 1st stage high pressure compressor showed scratch marks in the direction of rotation. This and other characteristics were not found in that one slot, which thus is believed to have been the origin of the engine failure with all other blade damage being secondary.
Incident Facts
Date of incident
Dec 13, 2013
Classification
Incident
Airline
ANA All Nippon Airways
Flight number
NH-243
Departure
Tokyo Haneda, Japan
Destination
Fukuoka, Japan
Aircraft Registration
JA701A
Aircraft Type
Boeing 777-200
ICAO Type Designator
B772
This article is published under license from Avherald.com. © of text by Avherald.com.
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