Boeing has admitted that it may never know what
caused the battery malfunctions that resulted in all its 787 Dreamliner
aircraft being grounded.
The admission came from Boeing's Larry Loftis, the general
manager of the company's 787 division.
Replacement battery systems are now being fitted to all 50
Dreamliners that had been in operation with airlines around the world.
Boeing expects the planes to resume service in the coming weeks.
Problems with the plane's
battery had resulted in the entire fleet of the 787s being grounded and deliveries
of the aircraft being halted.
Japan's All Nippon Airways and Japan Airlines are among the
first carriers that will have the batteries replaced.
All Nippon Airways (ANA) and Japan Airlines (JAL) are the two
biggest operators of the 787 Dreamliner.
Ryosei Nomura, a spokesman for ANA, said that the technicians
had started installing new batteries on five of its 17 Dreamliner aircraft.
The carriers still have to wait for approval from various
regulators before they can start to fly the planes commercially.
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