英闻天下——250 Long Road ahead for Dreamliners Batteries Probe

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　　The head of the National Transportation Safety Board says they will file their interim² findings in 30 days.

 

　　Deborah Hersman says investigators³ have pinpointed⁴ the origin of a battery fire on a 787 in Boston last month.

 

　　However, investigators have not yet determined⁵ the cause of the short circuit which led to the fire.

 

　　Hersman says Boeing is going to have to review its use of this particular battery technology.

 

　　"Boeing assessed that the likelihood of a smoke emission⁶ event from a 787 battery would occur less than once in every 10 million flight hours. The 787 fleet has accumulated less than 100,000 flight hours, yet there have now been two battery events resulting in smoke less than two weeks apart on two different aircraft. This investigation has demonstrated that a short circuit in a single cell can propagate two adjacent cells and result in smoke and fire. The assumptions used to certify⁷ the battery must be reconsidered."

 

　　The 50 Dreamliners in service have been grounded since January 16th due to the battery failures.

 

　　The Federal Aviation Administration has carried out a test flight of a 787 to see if any battery problems crop up.

 

　　Boeing is reportedly trying to find ways to mitigate⁸ and contain a fire if one starts in the batteries.

 

　　None of the 787's on-order for Chinese airlines has yet to be delivered.

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