Air France B772 near Seoul on Mar 14th 2012, engine failure
Last Update: February 13, 2014 / 16:53:36 GMT/Zulu time
Incident Facts
Date of incident
Mar 14, 2012
Classification
Report
Cause
Engine failure
Airline
Air France
Departure
Seoul, South Korea
Destination
Paris Charles de Gaulle, France
Aircraft Registration
F-GUOB
Aircraft Type
Boeing 777-200
ICAO Type Designator
B772
South Korea's ARAIB released their final report in Korean concluding the probable cause of the incident was:
the fuel pump was contaminated with metal fragments inside the interstage fuel strainer and the fuel control unit (HMU) did not work properly preventing the engine to reach the pilot commanded thrust output.
The ARAIB reported that the fuel pump had been swapped the previous day after the aircraft had experienced a fuel leak on the flight inbound to Seoul. A fuel pump, that had not been used in the 6 weeks prior to the occurrence, was mounted on the aircraft. A post occurrence inspection revealed a bolt had wedged inside the interstage strainer. Laboratory analysis identified the bolt as being identical with the bolts to be used for mounting the fuel pump.
The pressure differential valve, that should have opened to enable the fuel bypass the blocked main fuel feed and thus enable to fuel pump to supply fuel to the engine without restriction, was also found obstructed with metal fragments which prevented the valve to operate.
The bolt, while becoming wedged within the interstage strainer caused a hole which released metal fragments into the fuel pump's bearings and gearings, which ultimately resulted in the engine failure and shut down when the cog wheels became sufficiently deteriorated as result of the foreign objects.
Incident Facts
Date of incident
Mar 14, 2012
Classification
Report
Cause
Engine failure
Airline
Air France
Departure
Seoul, South Korea
Destination
Paris Charles de Gaulle, France
Aircraft Registration
F-GUOB
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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