US officials say they will lift the order grounding the Boeing 787 Dreamliner after accepting the manufacturer's revamped battery system.
But that move comes even though the root cause of battery failures that led to a fire on one plane and smoke on another remains unknown.
The Federal Aviation Administration said it would publish a notice next week lifting the three-month-old grounding order.
Boeing can then begin retrofitting planes with an enhanced lithium ion battery system.
Dreamliner flights could start back up within a week, the FAA told members of Congress.
An All Nippon Airways 787 made an emergency landing in January The FAA last month let Boeing test the revamped system, which includes additional insulation around each of the battery's eight cells to prevent a short circuit or fire in one of the cells from spreading to others.
The new system also includes better venting of smoke and gas from inside the battery to outside the plane.
There is also a stronger box to hold the battery to ensure that if a fire were to occur, it would not spread to the rest of the plane.
Boeing has done 20 successful tests of the new system, FAA Administrator Michael Huerta told Congress earlier this week.
The scorched remains of a lithium-ion battery pack The FAA's action will directly impact United Airlines and its six 787s. United is the only US airline with Dreamliners in its fleet.
But aviation authorities in other countries are expected to follow suit swiftly.
Boeing had delivered 50 planes to eight airlines in seven countries when a fire erupted in a battery aboard a Japan Airlines 787 parked at Boston's Logan International Airport on January 7.
The FAA and other authorities grounded the entire fleet after a second incident nine days later led to an emergency landing by an All Nippon Airways 787 in Japan.
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