A second battery used on a Boeing Dreamliner that had to make an emergency landing due to smoke coming out of its main power unit had been examined by experts, according to a Japanese safety board official’s statement made on Tuesday.
After a detailed examination of the auxiliary power unit (APU) battery of the plane, the experts found that two of the battery’s eight cells were misshapen. However, an initial inspection made after the All Nippon Airways (ANA) plane made an emergency landing last month found the battery to be intact, according to the international press.
“Details such as how much they bulged remains unknown,” said the official from the Japan Transport Safety Board (JTSB).
Japanese officials think the lithium-ion battery could have been damaged by a build up of heat that resulted in uncontrollably high temperatures. They released a photograph showing blackened remains of the main battery in the ANA plane, although initially the APU was thought to be in perfect condition.
All Nippon Airways and Japan Airlines, major customers of the aircraft with more than 100 combined orders, have been affected by the grounding, slashing hundreds of flights, affecting tens of thousands of passengers.