The Federal Aviation Administration of the United States on Tuesday approved the certification of Boeing plan to redesign the battery system for the 787 Dreamliner and greenlit a series of test flights before the aircraft can resume business travel. The agency said 787 allowed two test flights conducted to probe the new battery system.

“We will not allow the aircraft to return to service, unless we are satisfied that the new design ensures the safety of the aircraft and its passengers,” said Transportation Secretary Ray LaHood said in a statement.

The fleet of 787 on the ground and can not fly since a fire broke out in a battery that model aircraft parked at an airport in Boston