Boeing 787 chief project engineer Mike Sinnett says in hindsight he would have “challenged” the test assumptions in the evaluation and certification phase of the main and auxiliary power unit lithium-ion batteries for the 787. “We had a battery supplier with a lot of experience, and with a test method that was state of the art,” Sinnett said yesterday during the opening session of a two-day NTSB hearing into the failure of a Japan Airlines 787 auxiliary battery at Boston Logan ...


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