The transport ministry’s Aircraft and Railway Accidents Investigation Commission, the U.S. National Transport Safety Board and Boeing Aircraft Co. have made progress in their investigation of the fire and explosions on a China Airlines Boeing 737-800 at Naha airport on Aug. 20.

At first, a theory was floated that a fuel pipe inside the starboard pylon attachment broke, causing a large amount of fuel to leak and catch fire from residual engine heat. Now it is thought that a bolt and a nut in an arm connected to a starboard slat came off and pierced a fuel tank. It is hoped that the investigation will determine why the bolt and nut came off.

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