FILE - This Feb. 11, 2013 file photo shows a Boeing 787 flight test jet taxing following a test flight, at Boeing Field, in Seattle. Boeing's beleaguered 787 Dreamliners will be able to resume flights under an order expected to be issued Friday by the Federal Aviation Administration, although the root cause of battery failures on two of the planes is still unknown, according to congressional sources briefed by the agency. (AP Photo/Elaine Thompson, File)
FILE - This Feb. 11, 2013 file photo shows a Boeing 787 flight test jet taxing following a test flight, at Boeing Field, in Seattle. Boeing's beleaguered 787 Dreamliners will be able to resume flights under an order expected to be issued Friday by the Federal Aviation Administration, although the root cause of battery failures on two of the planes is still unknown, according to congressional sources briefed by the agency. (AP Photo/Elaine Thompson, File)
WASHINGTON (AP) ? Federal officials intend to lift the order grounding the beleaguered 787 Dreamliner after accepting Boeing's revamped battery system 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 Friday it would send airlines instructions and publish a notice next week lifting the 3-month-old grounding order that day. Boeing will then have the go-ahead to begin retrofitting planes with an enhanced lithium ion battery system.
Dreamliner flights could resume within a week, the agency told members of Congress. Boeing said it has stationed teams around the world to begin installing the fix.
The FAA gave Boeing permission last month to 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 the others. The new system also includes enhanced venting of smoke and gas from inside the battery to outside the plane. A strengthened box to hold the battery is an effort to ensure that if a fire were to occur, it wouldn't escape to the rest of the plane.
Boeing has completed 20 separate tests of the new system, FAA Administrator Michael Huerta told Congress earlier this week.
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 Jan. 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.
Boeing said new batteries and kits with the parts for the new battery systems are ready to be shipped immediately. The 787s will get the fix in approximately the order they were delivered, Boeing said.
"The Boeing team is ready to help get our customers' 787s back in the air where they belong," said Ray Conner, who runs Boeing Co.'s commercial airplane division.
The grounding also halted 787 deliveries. They were expected to resume "in the weeks ahead," after it installs the changes on planes at the two factories where they're assembled, Boeing said. It still expects to hit its target of delivering at least 60 787s this year, and that the battery issue "will have no significant impact" on its financial guidance for the year, the company said.
The FAA's action directly affects United Airlines, which is the only U.S. airline with 787s in its fleet. But aviation authorities in other countries are expected to follow suit swiftly.
United Airlines already has domestic 787 flights scheduled for May 31. Spokeswoman Christen David said no other schedule changes have been made yet. Its launch of Denver-to-Tokyo Narita flights is still planned for June 10, but that will depend on installing the battery fix by then, she said.
"We are mapping out a return-to-service plan, and we look forward to getting our 787s back in the air," she said by e-mail.
LOT Polish Airlines spokesman Marek Klucinski noted that they need permission from the European Aviation Safety Agency to resume flights. He said they hope that a decision on Friday would mean they can resume flights in the middle of next week. LOT has two planes, one in Warsaw and one that was stranded in Chicago by the grounding.
The 787 is Boeing's newest and most technologically advanced plane. It is the world's first airliner made mostly from lightweight composite materials. It also relies on electronic systems rather than hydraulic or mechanical systems to a greater degree than any other airliner. And it is the first airliner to make extensive use of lithium ion batteries, which are lighter, recharge faster and can hold more energy than other types of batteries.
Boeing has billed the plane to its customers as 20 percent more fuel efficient than other midsized airliners. That's a big selling point, since fuel is the biggest expense for most airlines
The plane's grounding on Jan. 16, an enormous black eye for Boeing, marked the first time since 1979 that FAA had ordered every plane of a particular type to stay out of the air for safety reasons.
UBS analyst David Strauss estimated last month that the 787 will cost Boeing $6 billion this year. Besides the battery problems, the plane already costs more to build than it brings in from customers.
United has six Dreamliners, plus another 44 on order. American and Delta have also ordered 787s. Boeing has orders for more than 800 of the planes from airlines around the globe.
The 787 has two identical lithium-ion batteries, one of which is located toward the front of the plane and powers cockpit electrical systems, the other toward the rear and used to start an auxiliary power unit while the plane is on the ground, among other functions. It was the battery toward the rear that caught fire and gushed smoke on the plane in Boston, which had recently landed after an overseas flight. It was the other battery toward the front that failed on the plane in Japan.
Every item that is part of an airplane, down to its nuts and bolts, must be certified as safe before FAA approves that type of plane as safe for flight. The two events have raised questions about why the FAA and Boeing didn't uncover problems with the batteries before the FAA certified the plane as safe for flight in 2011. In recent years, the FAA has relied to a greater extent on designated employees of aircraft makers to conduct the safety testing necessary of certification. Some aviation safety experts have questioned whether FAA has the in-house expertise to oversee the safety of cutting-edge technologies that haven't been in planes before.
Lithium batteries are much more likely to experience uncontrolled high temperatures that can lead to fires if they are damaged, exposed to excessive heat, overcharged or have manufacturing flaws. Despite their safety risks, they are increasingly attractive to aircraft makers as a way to cut weight and thus improve fuel efficiency.
The National Transportation Safety Board is investigating the Boston battery fire and the process by which the FAA certified the 787's batteries were certified as safe. The board has scheduled a two-day hearing beginning Tuesday at which FAA and Boeing officials are slated to testify.
NTSB officials have said the Boston battery fire began with a short circuit in one of the battery's eight cells, leading to uncontrolled temperatures and short-circuits in the rest of the battery's cells. Firefighters who responded to the incident reported dense clouds of white smoke and two small flames on the outside of the box that contained the battery cells.
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Associated Press writers Monika Scislowska in Warsaw, Poland, and Joshua Freed in Minneapolis contributed to this report.
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