Cause of 787 battery fire continues to elude NTSB

摘要

Fplight-recorder data from the Japan Airlines Boeing 787 that suffered a battery fire at Boston shows the auxiliary power unit's battery voltage started fluctuating just before it shut down. But the voltage did not exceed its 32V level during the event, says the US National Transportation Safety Board. NTSB investigators have released 547 pages of detail about the incident - including the recorder data, battery analysis process and the fireflghting response - but have not drawn any conclusions regarding the cause.