Japan probe finds miswiring of Boeing 787 battery on ANA flight that made emergency landing

TOKYO – Japan’s Transport Ministry says a probe into the overheating of a lithium ion battery in an All Nippon Airways Boeing 787 found it was improperly wired.

The Transport Safety Board said in a report issued Wednesday that the battery of the aircraft’s auxiliary power unit was incorrectly connected to the main battery that overheated, although a protective valve would have prevented power from the APU from doing damage.

The agency said that more analysis was needed to determine what caused the main battery to overheat and emit the smoke that prompted the Jan. 16 emergency landing of the ANA domestic flight and the worldwide grounding of Boeing 787 jets. They said they are consulting Boeing about the issue.

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