The NTSB on Thursday said the Boeing 787 Dreamliner battery that caught fire earlier this month in Boston shows evidence of thermal runaway, a serious condition in which an increase in temperature causes progressively hotter temperatures.
Still unclear is the question of which occurred first, the thermal runaway or a short circuit in the battery that was also found, said NTSB Chairman Deborah Hersman at a news briefing on the board’s investigation into the incident.
