Boeing may do 787 certification flight on Friday -source

WASHINGTON, April 4 Thu Apr 4, 2013 4:55pm EDT

WASHINGTON, April 4 (Reuters) - Boeing Co may carry out a certification test flight of its grounded 787 Dreamliner with a revamped battery system on Friday, a key step toward returning the state-of-the-art aircraft to flight, a U.S. government official said on Thursday.

The official, who was not authorized to speak on the record, said the certification test could be carried out on Friday if all remaining ground-based tests were completed on Thursday.

All 50 787s in service worldwide were grounded in January after problems with the airplane's lithium-ion batteries on two separate aircraft.

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