WASHINGTON (AP) – A Boeing plan to redesign the 787 Dreamliner’s fire-plagued lithium-ion batteries won approval Tuesday from the Federal Aviation Administration, moving the cutting-edge planes a step closer to flying passengers again.

The plan includes changes to the internal battery components to minimize the possibility of short-circuiting, which can lead to overheating and cause a fire. Among the changes are better insulation of the battery’s eight cells and the addition of a new containment and venting system, the FAA said in a statement.

The FAA statement didn’t provide an estimate for when the grounded planes might return to service.