Investigators will look at the certification process used in the lithium ion battery on Boeing’s 787 Dreamliners, the National Safety Transportation Board’s chairman Deborah Hersman told reporters in an update Thursday morning.
The investigation points to one of the battery’s cells as the origin of a fire that broke out on a Japan Airlines’ 787 last month.
The cell showed multiple signs of short circuiting. The cause has not been determined, however, Hersman said.
The NTSB will release an interim factual report within 30 days, Hersman said. A final report, however, will take longer.
The Federal Aviation Administration will make the decision on when the planes can return to flight.
Boeing’s 787 Dreamliners have been grounded since Jan. 16 so investigators could look at battery failures on the airplane.
“We have a lot of issues on the table,” Hersman said. “We have not yet identified the cause of the short circuit.”
Investigators are looking at the battery’s design, the manufacturing process and its cell charging, which involves how each individual cell is charged and how the charges come in, Hersman said.
Evidence points to the battery’s cell 6 as the origin of a fire on board a Japan Airlines flight.
The cell had multiple signs of short circuiting,
bot there cause has not yet been identified, Hersman said.