Boeing has said it has grounded one of the new 787s it is testing because of an engine problem.
The company said the plane was getting ready for take-off in Roswell, New Mexico, when its engine surged.
Spokeswoman Yvonne Leach said the crew and the plane were not in any danger. Rolls-Royce sent a new engine which was being installed on the plane.
Ms Leach said it was too soon to know when the plane would fly again, or if the 787 testing schedule would be affected.
Boeing has six of the planes in flight tests and is aiming to deliver the 787 early next year, when it will be more than two years late.
The issue was reported today by the trade publication Aviation Week.