Boeing expects the 737 Max software to be solved by the end of March

Boeing told the airline that he hoped to have new software for his 737 Max aircraft ready by the end of the month.

The plane was grounded after the crash of the Ethiopian Airlines aircraft earlier this month.

Documents consulted by the BBC confirm that updating the software will limit the operation of the controversial MCAS system.

This machine was used by a Lion Air 737 Max that crashed off the coast of Indonesia last year.

Investigators say that there are "obvious similarities" between the two.

Boeing's Dennis Muilenburg, the company's president and CEO, said in an open letter, "Soon, we will be releasing a software update and corresponding pilot training for the 737 MAX, which will address the concerns discovered as a result of the Flight accident 610 of Lion Air. "

He added that the company was working in "total cooperation" with the relevant authorities and regulators.

Changes will also be made to cockpit warning systems, the flight crew user manual will be updated and computer-based training will be provided to pilots.

It is not known how long the 737 Max will stay in the ground.

Investigators who investigated Ethiopian Airlines received data from flight recorders, uploaded by experts to France earlier this week. They intend to issue a preliminary report by mid-April.

On Tuesday, investigators examining black box records of the flight revealed "obvious similarities" with the previous accident.

The French BEA Accident Authority did not explain the similarities in detail, but the media suggested that they had found similar flight angles before the collisions.

These are recurring questions about the design of 737 Max and its willingness to fly.

The flight of Ethiopian Airlines eight days ago and the aircraft Air Lion in October crashed a few minutes after takeoff.

In the case of the Lion Air flight, the pilots had difficulties with a new system on the Boeing 737 Max, designed to prevent the plane from taking off.

This prevents a jet from heading upwards at too high an angle, where it could lose its lift.

But an investigation of the Lion Air flight showed that the automatic anti-stall system repeatedly forced the nose of the plane to nose down more than 20 times.

Underrated power

US regulators and security experts are now asking how far the FAA and Boeing have thoroughly examined the anti-stall system and how far pilots around the world have been trained to this system when their airlines bought new planes.

Over the weekend, an article in the Seattle Times claimed that some pre-crash analyzes had revealed that the system, called the "Maneuverability Enhancement System", revealed critical loopholes.

He claims that FAA officials have asked his safety engineers to delegate safety assessments to Boeing and approve the resulting analysis.

The report states that the analysis done by Boeing underestimated the power of the control system and that it could reset each time the pilot responded.

This meant that the system could repeatedly lower the nose of the plane.

Boeing's Muilenburg said the company is in close contact with the authorities: "We are working closely with the US Federal Aviation Administration, the Ministry of Transportation and the National Transportation Safety Board on all matters related to the Lion Air accidents of Ethiopian Airlines since the accident of Lion Air occurred last October. "