Boeing 787 Dreamliner goes on a test flight 25 March 2013 Last updated at 21:05 Boeing has taken one of its 787 Dreamliners on a test flight to check the plane's new battery system, as it aims to move closer to ending a two-month grounding of the aircraft. The US manufacturer had to ground all its 787s in January after the planes' lithium-ion batteries emitted smoke on several separate occasions. Data from the flight will be submitted to the Federal Aviation Administration. The FAA will ultimately rule on when the 787 can resume passenger flights. A second test flight is expected to take place later this week. According to some estimates, Boeing is losing $50m (£33m) a week while the 787 is grounded. In addition to airlines not being able to fly their existing 787s, Boeing is also prevented from delivering new Dreamliners to customers. Some Boeing bosses have said they hope for the 787 to be able to resume services in May, but many analysts expected it to take a number of additional months. The plane is the first in the world to use the lithium-ion batteries, which are lighter, hold more power and recharge more quickly.