Securaplane, a unit of Britain's Meggitt Plc, first began working on the charger in 2004, but suffered millions of dollars of damages in November 2006 after a lithium-ion battery used in testing exploded and sparked a fire that burned an administrative building to the ground. The US National Transportation Safety Board on Sunday ruled out excess voltage as the cause of a battery fire on the 787 at the Boston airport this month.
It said investigators would travel on Tuesday to Tucson, Arizona, where Securaplane is based, to test and examine the charger and download memory from the controller for the auxiliary power unit. They also plan to travel to Phoenix and carry out similar tests at the site where a unit of United Technologies Corp builds the power unit.
Fiona Greig, a spokeswoman for Securaplane, said the company had been invited to "contribute to the investigation process" and planned to fully support it. "In line with NTSB's practices, however, it would not be helpful to that investigation to comment further," she said in a statement provided to Reuters.
The US Federal Aviation Administration (FAA) on Sunday said it had investigated safety complaints leveled by a former Securaplane employee in 2008 and 2009 but determined that the allegations focused on prototypes that were not ultimately used in the new lightweight airliner.
Shubhayu Chakraborty, president of Securaplane, earlier told Reuters that his company's lithium-ion battery charger was currently only in use on the Boeing 787, although it is developing different systems for use on other aircraft. Securaplane is building a lithium-ion battery system for the KC-390 military transport plane being developed by Brazil's Embraer SA, which is due to have its first flight in 2014. Embraer declined comment.
The company is also developing backup batteries for the Embraer Legacy 450 and 500 business jets and will make the lithium battery for the next-generation Eurocopter EC-135 helicopter being developed by EADS, according to the company's website. The charger is part of a complex system that uses a lithium-ion battery made by Japan's GS Yuasa Corp and electrical systems made by France's Thales to provide start-up power for an auxiliary power unit, which is built by Pratt & Whitney, a unit of United Technologies.