Boeing expects 737 Max software fix by end of March
Boeing has told airlines it expects to have new software for its 737 Max plane ready by the end of the month.
The plane has been grounded following the Ethiopian Airlines aircraft crash earlier this month.
Documents seen by the BBC confirm that the software update will limit the operation of the controversial MCAS system.
That was the same system used by a Lion Air 737 Max which crashed off the coast of Indonesia last year.
Investigators say there are "clear similarities" between the two.
Boeing's : "Soon we'll release a software update and related pilot training for the 737 Max that will address concerns discovered in the aftermath of the Lion Air Flight 610 accident."
He said the company had been working in "full co-operation" with the relevant authorities and regulators.
There will also be changes to the cockpit warning systems, the flight crew operating manual will be updated and there will be computer-based training for pilots.
It is not clear how long the 737 Max will remain grounded.
Investigators looking into the Ethiopian Airlines received data from the aircraft's flight recorders, downloaded by experts in France, earlier this week. They intend to to issue a preliminary report by mid-April.