Aviation safety officials from the U.S. and Japan on Monday visited the GS Yuasa Corp., in Kyoto, which manufactured the lithium-ion batteries for the 787 that led to the fleet's grounding last week. The investigators toured the plant and were briefed by company officials about the design, production and quality, according to Reuters. The U.S. investigators said they have ruled out excess voltage as a cause of the battery fire in Boston on Jan. 7, and will expand their probe to look at the battery charger and the 787's auxiliary power unit. Meanwhile, the NTSB plans to continue tests of the batteries this week in Arizona.
This is a companion discussion topic for the original entry at https://www.avweb.com/news/investigators-probe-787-battery-maker