Thursday, November 23, 2017
Business

Boeing 787s may not fly until May

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Federal Aviation Administration chief Michael Huerta said Wednesday that Boeing won't get its 787 Dreamliners back in passenger service without extensive testing and recertification of its proposed fix for the jet's lithium-ion battery problem.

In testimony before a congressional subcommittee, Huerta said he expects a report back from his technical staff next week that will offer an assessment of the fix that Boeing formally proposed Friday.

But he said that FAA approval for Boeing to go ahead and implement its fix will only be the start of the process.

"Once we approve the plan, there will be a great deal of testing, a great deal of further analysis and re-engineering before these planes are back in the air," Huerta said.

Huerta did not cite any potential time frame, but the requirement for extensive testing, analysis and re-engineering suggests at least several weeks of work after Boeing gets the green light to proceed — which means it's unlikely the 787s could be flying passengers again any sooner than late April or May.

Huerta said that although GS Yuasa of Japan manufactured the battery to a design by French subcontractor Thales, "Boeing is stepping in and assuming responsibility for the design and testing" of a revamped battery system.

He said Boeing has proposed a "comprehensive plan" to cover "a handful of potential areas of probable cause," all of which are within the battery.

He said Boeing's proposed fixes provide mitigation of the impact of any overheating of the battery at three levels: re-engineering of the design to reduce the possibility of a cell overheating; other measures to stop any overheating in a single cell from spreading to adjacent cells; and finally, design changes to contain any batterywide incident so that the airplane is not endangered.

"Any re-engineering and how it gets built is still to be worked out," Huerta said.

Earlier this month, the FAA granted Boeing permission to fly two flight tests to gather data needed for its proposed fix.

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