The Federal Aviation Administration announced Friday that it has formally approved Boeing’s design for modifications to the 787 Dreamliner battery system, clearing the way to end the plane’s three-month grounding.
Boeing Co. said it will immediately begin modifying the 50 already-delivered 787s around the world and that regular deliveries will resume soon.
FAA spokeswoman Laura Brown said the agency hasn’t changed the Dreamliner’s ETOPS, or extended operations, certification, which means the 787 keeps its regulatory approval to fly up to three hours away from the nearest airport.
In a statement, Boeing CEO Jim McNerney said the decision “clears the way for us and the airlines to begin the process of returning the 787 to flight with continued confidence in (its) safety and reliability.”
Despite the unprecedented setback of the grounding, McNerney said “the promise of the 787 and the benefits it provides to airlines and their passengers remain fully intact.”
Officials insisted Boeing’s new battery design ensures the safety of the airplane.
FAA chief Michael Huerta said he reached the decision to approve the fix only after “a team of FAA certification specialists observed rigorous tests we required Boeing to perform and devoted weeks to reviewing detailed analysis of the design changes.”
Boeing engineers “spent more than 100,000 hours developing test plans, building test rigs, conducting tests and analyzing the results to ensure the proposed solutions met all requirements,” the jetmaker said in a statement.
The redesigned battery “made a great airplane even better,” Boeing Commercial Airplanes CEO Ray Conner said.
The FAA will issue instructions to airlines next week detailing the Boeing-designed modifications and will publish in the Federal Register the final directive that will allow the modified 787s to return to passenger service.
The modifications include a steel containment box and a titanium tube connecting the box and the fuselage skin that will suck any gases, including oxygen, out of the box and prevent a fire.
Boeing has also added electrical and thermal insulation around the eight cells of the battery to minimize short circuits and prevent any overheating within one cell from spreading to the others.
The FAA said it will have teams of inspectors ready at locations where the 787s are being modified. Any return to service of the modified 787 will only take place after the FAA accepts the work. As the certifying authority, the FAA will also work with other regulatory authorities around the world as they finalize their own acceptance procedures.
The decision not to reduce the 787’s ETOPS certification must come as a relief to Boeing. Huerta of the FAA told a Senate hearing Tuesday that the jet’s ETOPS approval was under review.
Maintaining the three-hour allowed flight time away from the nearest airport is crucial to the jet’s use for flying long routes over the ocean or the poles, a key feature for its airline customers.
U.S. Rep. Rick Larsen, D-Wash., welcomed the FAA’s step.
He said Boeing in late March gave him a briefing on the battery system fix and a close look at the hardware that has to be installed during the modification work.
“I was impressed with the ingenuity the Boeing engineers put into this,” he said.
But the battery incidents and the grounding demand more investigation, said Larsen, the ranking Democrat on the House Aviation Subcommittee.
“Once the fixes are done and these planes are back up and flying, Congress needs to go back and look at the certification process and figure out: How did we ever get to this place?” Larsen said.
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