Boeing will redesign the system and conduct new tests , says it is confident . Note : `` This comprehensive series of tests will show us whether the proposed battery improvements will work as designed , '' said U.S. Transportation Secretary Ray LaHood . Tests will need to be lengthy and thorough . May still be months before commercial passenger flights begin . Boeing 's 787 was grounded in January after two battery failures .
Boeing will redesign the system and conduct new tests , says it is confident . Note : Tests will need to be lengthy and thorough . May still be months before commercial passenger flights begin . Boeing 's 787 was grounded in January after two battery failures .