Federal investigators in the United States are set to conduct more tests aimed at eventually returning Boeing's grounded Dreamliner 787 to the sky.
Tuesday's National Transportation Safety Board tests will be conducted at a special facility Arizona.
The N-T-S-B says tests in Washington showed that a lithium-ion battery that caught fire on an empty Dreamliner in Boston this month was not overcharged.
Suspicions about the batteries and a possible fire risk prompted the U-S and other nations to ground all 50 Dreamliners worldwide last week.
The aircraft, which costs about 200 million dollars and debuted 15 months ago, is the first major airliner to be rolled out in years.