US FAA has given Boeing permission to operate 787 test flights to help determine why batteries failed and overheated on two in-service Dreamliners. The worldwide 787 fleet has been grounded since the second of the incidents occurred Jan. 16. “In this case, the primary purpose of the test flights will be to collect data about the battery and electrical system performance while the aircraft is airborne,” US transportation secretary Ray LaHood and FAA administrator Michael ...

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