there is also an open issue around fuel leaks on the Dreamliner. In early December, US officials warned of a manufacturing fault with fuel lines, and earlier this month a JAL plane in Boston leaked before takeoff.
Industrial manufacturer Eaton Corp said Wednesday it was cooperating with investigators looking at the fuel leaks.
"Without speaking about either the incident or investigation, I can tell you that we do supply pumps and valves to the program," a spokeswoman said.
The 787 program was already years behind schedule before last week's grounding, which means Boeing cannot deliver newly manufactured planes to customers. Boeing's chief 787 engineer, Mike Sinnett, told an aviation conference in Dublin he could not say when that would change.
"I can't really say anything about the timeframe of the investigation. The NTSB is really the only authorized authority in the US to talk about this investigation and they made some recent statements, but I can't speculate on timeframe," Sinnett said Wednesday in remarks made by phone from Seattle.
US Transportation Secretary Ray LaHood, the country's top transportation official, said Wednesday the goal was to return the 787 to service as soon as possible but that the government would not rush the plane back either.
"We are working diligently with Boeing to figure out the problem and find a solution. Our goal is to get this done as quickly as possible, but we must be confident that the problems are solved before we can move forward," LaHood told the Aero Club of Washington, an aviation advocacy group.
FAA Administrator Michael Huerta, appearing at the same event, said the review was looking at the 787's certification, manufacturing and assembly processes, and that he could not speculate on an end date.
For at least one Chinese customer, the uncertainty about the Dreamliner's production and delivery schedule has meant delays in launching new routes.
"Frankly, it's a little disappointing the aircraft has been delayed so many times," said Chen Feng, chairman of Hainan Airlines Co Ltd parent HNA Group, in an interview at the World Economic Forum in Davos. "We still think it's a good aircraft, but this has had some