Michelle Dunlop Herald Writer
The cause of a Jan. 7 battery fire on a Boeing 787 remains unknown Friday as officials bring in more battery experts and continue their investigation.
The National Transportation Safety Board released a seventh update on its investigation into the fire last month aboard a Japan Airlines 787 parked at Logan International Airport in Boston. Boeing’s 787 has been grounded since Jan. 16.
Here’s a list of new information from the NTSB:
- The auxiliary power unit battery was the original battery delivered with the airplane on Dec. 20, 2012. All eight battery cells came from the same manufacturing lot; the battery was installed on the aircraft Oct. 15, 2012.
- Testing this week, which includes electrical and mass measurements and infrared thermal imaging, shows no anomalies in the individual battery cells.
- The cells are undergoing CT scanning to examine their internal condition.
- A battery expert from the Department of Energy joined the investigative team on Thursday to lend his expertise to the ongoing testing and validation work.
- Next week, the NTSB battery testing team will initiate a non-invasive “soft short” test of all battery cells to find high resistance or “soft” shorts within a cell.
- An NTSB investigator will travel to France with the battery contactor from the JAL event battery, for examination at the manufacturer. The battery contactor connects a wiring bundle from the airplane to the battery.
ANA, the Dreamliner’s launch customer, said yesterday that the jet’s grounding has cost it about $15.4 million in lost revenue.