All Nippon Airways's Boeing 787 at Haneda airport in Tokyo: the incident prompted regulators to ground 50 Dreamliners already in service. Photograph: Koji Sasahara/AP
A team of experts from US aviation authorities and Boeing have arrived in Japan to inspect a 787 Dreamliner passenger jet that made an emergency landing on a domestic All Nippon Airways flight earlier this week.
The incident prompted regulators in the US and elsewhere to ground the 50 Dreamliners already in service. Battery-related problems are being investigated after warning lights indicated a battery fault on the ANA flight on Wednesday.
The 787, a lightweight, mainly carbon-composite aircraft, has been plagued by mishaps, raising concerns over its use of lithium-ion batteries, which pack more energy and are faster to recharge but which are potentially more volatile.
The five representatives from the US National Transportation Safety Board (NTSB), Federal Aviation Administration (FAA) and Boeing are helping Japanese authorities in their investigation of the aircraft, which remains parked at the side of Takamatsu airport in western Japan.
The Japan Transport Safety Board (JTSB) aims to end its initial checks by around midday on Saturday, a source told Reuters.
"The Boeing 787 is an absolutely wonderful aircraft and we will spare no effort to help it get back in the air safely as soon as possible," said ANA spokesman Hideya Oishi.
GS Yuasa Corp, the Japanese company that makes batteries for the Dreamliner, said it had also sent three engineers to Takamatsu to help the investigation.
A person at the company, who asked not to be named, said: "Our company's battery has been vilified for now, but it only functions as part of a whole system. So we're trying to find out exactly where there was a problem within the system."
Shares in the Kyoto-based battery maker rose 3% on Friday, having dropped around 18% since 7 January when a battery caught fire in the auxiliary power unit (APU) of a Japan Airlines 787 parked at Boston Logan International airport.
The US investigation into that incident is focused for now on the Japanese-made batteries, with no indication the APU – built by United Technologies Corp's Pratt & Whitney – was involved, said a person familiar with the government inquiry, who was not authorised to speak publicly.
Laura Brown, a spokeswoman for the FAA in Washington, said she could not comment as the issue was part of the investigation.
Regulators in Japan said it was unclear when the Dreamliner could be back in the air. Japan is the biggest market for the 787, with ANA and JAL operating 24 of the 290-seat wide-bodied planes, each of which costs $207m (£129m).
Separately, the country's transport ministry said a fuel leak on a JAL-operated 787 last week was due to a malfunction in a drive mechanism that controls a valve. It said the British company that makes the valve was investigating. The ministry declined to name the firm.
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