Ethiopia releases preliminary report into Boeing 737 MAX crash

Ethiopian Air pilots turned off 737 MAX anti-stall system. Then it turned on again

The Ethiopian transport minister said earlier that Ethiopian Airlines pilots had been unable to prevent the plane from repeatedly nosediving, despite having followed proper procedures as recommended by planemaker Boeing.

Boeing issued the following statement regarding the release today of the preliminary investigation report of Ethiopian Airlines Flight 302 by the Ethiopian Accident Investigation Bureau (AIB) on the Boeing Max crash.

Investigators also called on aviation authorities to "verify that the review of the aircraft flight control system related to flight controllability has been adequately addressed by the manufacturer before release of the aircraft" for commercial use.

In a statement posted on Twitter, Ethiopian Airlines said the investigation into the crash of the Boeing 787 Max 8 could continue for up to a year, as more authorities, including the UAE, joined the FAA investigation board.

Crashed plane's pilots apparently followed Boeing rules * Boeing: more time needed to fix 737 Max * What connects the Ethiopian Airlines and Lion Air crashes?

What also isn't clear is whether the Ethiopian pilots followed Boeing's recommendations to the letter in dealing with the system repeatedly pointing the nose down.

Last October, Lion Air flight JT 610 crashed into the sea near Indonesia killing all 189 people on board.

Boeing said it's reviewing the findings, and the FAA said it's working to understand what happened. CBC News has obtained a copy of the 737 MAX flight crew manual - and what's not in it raises troubling questions about the manufacturer's lack of disclosure.

It began to feed faulty data into the Maneuvering Characteristics Augmentation System (MCAS), created to prevent stalls by pushing the nose of the plane lower.

"We remain confident in the fundamental safety of the 737 MAX", CEO Dennis Muilenburg said in a statement. Air travelers have been forced to reschedule canceled flights and airlines are losing money while their new planes remain parked on the ground until further notice.

The comments underscored the need for a software update that Boeing already has under way for an anti-stall system that can push down the plane's nose.

- Boeing said on April 3 it had successfully tested an update of the MCAS system.

He added: "Meanwhile we are very proud of our pilots' compliance to follow the emergency procedures and high level of professional performances in such extremely hard situations".

- The preliminary report into the Ethiopian disaster, published on April 4, showed a key sensor was wrecked, possibly by a bird strike.

The agency said Monday that it anticipates Boeing's final software improvements for 737 Max airliners "in the coming weeks".

Aviation safety analyst Paul Hayes said deeper investigation would delve into the role played by software and how pilots were able to respond, and said he hoped scars from the 2010 dispute would not get in the way of a comprehensive investigation.

However, Moges told the New York Times after the news conference that the pilots turned MCAS on and off, but she couldn't say how many times.

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