JAL Express B738 at Tokyo on Oct 20th 2012, engine shut down in flight
Last Update: November 3, 2015 / 15:43:04 GMT/Zulu time
Incident Facts
Date of incident
Oct 20, 2012
Classification
Incident
Airline
JAL Express
Flight number
JL-1471
Departure
Tokyo Haneda, Japan
Destination
Matsuyama, Japan
Aircraft Registration
JA342J
Aircraft Type
Boeing 737-800
ICAO Type Designator
B738
Japan's Transport Ministry reported on Oct 23rd that an initial examination of the engine showed blade damage in the last stages of the turbine, more detailed examination then revealed substantial internal damage also in the compressor area prompting Japan's Transportation Safety Board to open an investigation and dispatch three investigators on site.
On Dec 8th 2012 the NTSB said the pilot reported low engine RPM and high exhaust gas temperatures, the #1 engine was shut down. Ground personnel found damage to the high pressure compressor and turbine blades during a preliminary inspection. The JTSB is investigating.
On Oct 29th 2015 the JTSB released their final report concluding the probable causes of the serious incident were:
It is highly probable that the major damage to inside of the Engine was caused by all the blade tips in the fifth stage of High Pressure Compressor (HPC) of the JA342J coming into contact with the HPC casing, resulting in a heavy load applied to the blade roots to produce cracks; consequently, they were propagated by the repeated loads from the flight cycles, and resulted in separation of all blades airfoils in the fifth stage of HPC.
With regard to the fact that all the blade tips in the fifth stage of HPC coming into contact with the HPC casing, it is somewhat likely that the clearance between the blade tips in the fifth stage of HPC and the casing became smaller due to the influence of the water accumulation in the cavities at the bottom of the fifth stage HPC casing, and also the clearance between them becoming smaller than usual for some reason at the time of the occurrence of this serious incident.
Incident Facts
Date of incident
Oct 20, 2012
Classification
Incident
Airline
JAL Express
Flight number
JL-1471
Departure
Tokyo Haneda, Japan
Destination
Matsuyama, Japan
Aircraft Registration
JA342J
Aircraft Type
Boeing 737-800
ICAO Type Designator
B738
This article is published under license from Avherald.com. © of text by Avherald.com.
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