Air France B772 near Seoul on Mar 14th 2012, engine failure
Last Update: February 13, 2014 / 16:53:36 GMT/Zulu time
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.
This article is published under license from Avherald.com. © of text by Avherald.com.
Read unlimited articles and receive our daily update briefing. Gain better insights into what is happening in commercial aviation safety.
Support AeroInside by sending a small tip amount.
An Air France Embraer ERJ-190, registration F-HBLN performing flight AF-7751 from Clermont-Ferrand to Paris Charles de Gaulle (France) with 64…
An Air France Airbus A330-200, registration F-GZCJ performing flight AF-736 from Brazzaville (Congo) to Paris Charles de Gaulle (France) with 136…
An Air France Airbus A321-200, registration F-GTAE performing flight AF-1002 from Paris Charles de Gaulle (France) to Heraklion (Greece), was enroute…
An Air France Boeing 777-300, registration F-GSQG performing flight AF-55 from Washington Dulles,DC (USA) to Paris Charles de Gaulle (France), was…
An Air France Boeing 777-300, registration F-GSQY performing flight AF-454 from Paris Charles de Gaulle (France) to Sao Paulo Guarulhos,SP (Brazil),…
A Jet2.com Boeing 737-800, registration G-LSAE performing flight LS-910 from Fuerteventura,CI (Spain) to Manchester,EN (UK), was climbing out of…
A Norwegian Air Shuttle Boeing 737-800, registration LN-NGM performing flight DY-5422 from Alicante,SP (Spain) to Helsinki (Finland) with 167…
Are you researching aviation incidents? Get access to AeroInside Insights, unlimited read access and receive the daily newsletter.Pick your plan and subscribe
A new way to document and demonstrate airworthiness compliance and aircraft value. Find out more.
ELITE Simulation Solutions is a leading global provider of Flight Simulation Training Devices, IFR training software as well as flight controls and related services. Find out more.
Never miss an article from AeroInside. Subscribe to our free weekly newsletter and join 5377 existing subscribers.
Popular aircraftAirbus A320
Boeing 737-800 MAX
Popular airlinesAmerican Airlines