The FBI expects to have the results of its analysis of data from a flight simulator taken from the home of the missing Malaysia Airlines jet's pilot within a day or two.
Malaysian officials had asked the Federal Bureau of Investigation to help recover files deleted from the simulator's hard drive.
FBI chief James Comey told lawmakers on Wednesday that experts were working "literally round the clock" to finish their analysis, in the hopes that the data could provide clues to what happened to Flight MH370.
Malaysia "took us up on our technical abilities, which involves the exploitation of certain computer forensic materials that they've given to us. That work is ongoing," Comey told a House subcommittee meeting to discuss the FBI's 2015 budget request.
"I don't want to say more about that in an open setting, but I expect it to be done fairly shortly, within a day or two."
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The Malaysia Airlines plane vanished on March 8 with 239 passengers and crew, including six Australians and two New Zealanders, on board.
Malaysian police removed the simulator from Captain Zaharie Ahmad Shah's home nearly two weeks ago, after investigators said they believed the Boeing 777 had been deliberately diverted from its intended route by someone on board.
Malaysia on Monday announced that evidence showed the jet crashed in the southern Indian Ocean.
A multinational search for the wreckage is continuing on Thursday, energised by recent satellite images showing more than 100 floating objects in the remote waters.
Comey did not indicate whether the results of the analysis would be made public.
