FAA: Boeing 787 fix needs much testing Boeing Co.'s proposal to get the 787 Dreamliner back in the skies, while comprehensive, will require extensive testing even if approved before regulators end the plane's grounding, the top U.S. aviation official said. Huerta, in the most detailed comments to date on Boeing's presentation Feb. 22, told reporters after the hearing that it "looks to be a very comprehensive proposal" featuring multiple alterations designed to address every possible cause of battery incidents that grounded the plane. Huerta said the Boeing proposal contains three general safety layers: attempting to ensure that none of the eight individual cells within a battery overheats, preventing a failed cell from harming adjacent cells, and protecting the plane from damage if all the cells burn. Battery maker GS Yuasa Corp. has told FAA officials the changes should go beyond Boeing's proposal, to include protections that ensure proper power levels go to the batteries, said two government officials who asked not to be named because they weren't authorized to speak about Yuasa's activities.