That plane plunged to the ground shortly after takeoff from Addis Ababa, five months after a similar Lion Air nosedive in Indonesia that killed all 189 passengers and crew. The crashes, which together killed 346 people, led to the grounding of the global 737 MAX fleet.
That sequence of events is nearly identical to problems on board the doomed Lion Air Flight 610 that crashed in October. That system, created to deal with potential issues that could arise from the plane's redesigned engine placement, automatically adjusts the plane's angle to prevent stalling.
Boeing must also contend with lawsuits filed on behalf of dozens of victims of the 2 crashes, including the family of Stumo, who are asking whether the Ethiopian disaster could have been prevented after what happened to Lion Air.
What nobody appeared to know at the time all of this was certified as safe was that if one of the 737 Max's AoA sensors malfunctioned for whatever reason, MCAS could decide the jet was in that unsafe nose-high condition and begin inappropriately applying nose-down trim, forcing the airliner into a nosedive at an unexpected moment.
According to investigators preliminary reports, the connection in both Ethiopian Airlines Flight 302 and Lion Air Flight 610 is an anti-stall system known as MCAS-Maneuvering Characteristics Augmentation System-which activates when it receives erroneous data from the aircraft's sensor. A source from Boeing told CBS that there were no reports of damage from foreign objects. The Nikkei Asian Review (NAR) reported that Garuda "believes in Boeing aircraft and its technological capabilities." .
Boeing told neither Southwest Airlines, the biggest 737 MAX customer, nor the Federal Aviation Administration when it omitted an emergency alert system meant to tell pilots when sensors are malfunctioning in newer models of the plane. "That's a software update that we know how to do ... this will make the airplane even safer", Mr Muilenburg said.
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Interested in Boeing? Add Boeing as an interest to stay up to date on the latest Boeing news, video, and analysis from ABC News. The airline said the restructuring "results in a significant deferral of capital expenditure and provides access to the superior economic benefits of the Max 10 aircraft".
Transport Canada banned the 737 Max from Canadian airspace as part of an worldwide response to the fatal March 10 crash of an Ethiopian Airlines plane.
Boeing is working on changing the MCAS so it can get the planes back in the air. "Every one of our airplanes includes all of the safety features necessary for safe flight".
WestJet says in a news release that it has adjusted flight times on some routes or substituted larger aircraft with fewer flights, but that it needed to suspend a small number of routes where no alternative aircraft were available. "Rather, we look at the interaction of all elements and systems, in addition to human and other external factors".
The "disagree alert" was tied or linked into the angle-of-attack indicator.
Muilenburg insisted that MCAS system "was designed per our standards" and followed proper certification procedures. Boeing did not immediately respond to a request for comment.