Boeing chief engineer Mike Sinnett has expressed confidence in the Dreamliner's battery system.
- Boeing's Dreamliner 787 makes an emergency landing after a battery alarm signals
- Landing occurs as U.S. investigators examine another battery involved in a fire
- The fire occurred in a Japan Airlines Dreamliner at Boston's Logan Airport
(CNN) -- A Boeing 787 Dreamliner made an emergency landing in Japan early Wednesday morning after an alarm signal on a battery activated, a spokesman for All Nippon Airways said.
The ANA flight, which was scheduled to leave Yamaguchi Ube Airport at 8 a.m. (6 p.m. ET Tuesday) and to arrive at Haneda Tokyo International Airport at 9:25 a.m., made an unscheduled landing in Takamatsu airport, Takuya Taniguchi said.
Boeing spokeswoman Lori Gunter said the company is "aware of the event and working with the customer."
The emergency landing occurred as the National Transportation Safety Board in the United States continues its investigation of a battery fire last week.
NTSB investigators are disassembling the burned battery involved in the January 7 fire aboard a Japan Airlines Boeing 787 at Logan International Airport in Boston. This week the NTSB released photos of the battery that showed charred parts and wire bundles.
The fire broke out in the avionics compartment of an empty Dreamliner shortly after it had arrived and passengers had disembarked. A maintenance worker noticed smoke in the belly of the plane and called emergency crews.
FAA investigates Dreamliner
The battery powers the auxiliary unit and provides electricity for ground operations. The damaged battery was removed last week and transported to a federal laboratory in Washington, according to the NTSB.
When new, the battery weighs about 63 pounds. It is approximately 19 by 13 by 10 inches. Officials said they made digital radiographs and computer scans to document the internal condition of the battery before taking it apart.
Dreamliner safety review: What it means for fliers
Investigators will download any retrievable data as part of the inquiry. In addition, the airplane's combined flight data recorder and cockpit voice recorder were also sent to the NTSB for analysis.
Fire and rescue personnel used a fire retardant to contain the flames after the battery exploded.
Last week, Boeing chief engineer Mike Sinnett expressed confidence in the battery system. "I am 100% convinced the airplane is safe to fly. I fly on it all the time," he said.
A week Boeing would like to forget
In addition to the NTSB investigation, Japanese and French aviation officials also have launched investigations.
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