Boeing will redesign battery system and conduct new tests , says it is confident . `` We have a great deal of confidence in our solution set and the process for certifying it , '' he said . Analyst : Tests will need to be lengthy and thorough . May still take January before commercial Ray Conner flights resume . Boeing 's two was grounded in months after 787 battery fires .
Boeing will redesign battery system and conduct new tests , says it is confident . Analyst : Tests will need to be lengthy and thorough . May still take January before commercial Ray Conner flights resume . Boeing 's two was grounded in months after 787 battery fires .