The crew of the Ethiopian Airlines commanding the Boeing 737 Max 8, which had crashed last month and killed all 157 people on board, followed all recommended procedures but was unable to regain control of the damned flight, Ethiopian investigators said the reporters on Thursday morning with.
Ethiopian Transport Minister Dagmawit Moges said that a preliminary result of a fatal crash investigation showed that the aircraft had a valid certificate of airworthiness, that pilots had permission to fly and were "normal". "When the jet began its nasal diving, the pilots" repeatedly "performed all of Boeing, the manufacturer's emergency response, but" could not control the plane, "Moges told reporters at a press conference in the Ethiopian capital, Addis Ababa.
Ethiopian Airlines Flight 302 failed on a clear day on the morning of March 1
Based on the first report, Ethiopian security investigators recommend that Boeing review the aircraft flight control system of its new Model 737 Max 8 and verify that the flight control capability has been adequately addressed by the manufacturer before the operation of that aircraft resumes its duties as Minister of Transport.
Two aviation sources familiar with the probe told ABC News on Wednesday that the Ethiopian Airlines' flight on departure from a bird or a foreign body suffered a damaged angle sensor and triggered erroneous data and the activation of an anti-stall system. – called MCAS – sends the pitch of the plane down and finally crashes into the ground.
According to the sources, the pilots did not attempt to electronically pull up the nose of the aircraft before following Boeing's emergency procedures, which shut off power to the horizontal stabilizer on the back of the aircraft. A source told ABC News that they had manually attempted to bring the nose of the aircraft up with the help of the trim wheel. Soon after, the pilots put the horizontal stabilizer back into operation.
After power was restored, the MCAS was turned on again, the sources said, and the pilots could not regain control before the crash.
Boeing said in a statement Wednesday: "We advise caution, speculation and conclusions on the results before the flight data and preliminary report are published."
The Chicago-based aircraft manufacturer has delivered more than 370 Boeing 737 Max 8 jets to 47 airlines since its debut in May 2017, 72 of which are currently flying in the US, Boeing said.
French American investigators help with the Ethiopian probe, centering on Max's automated anti-stall security system and its potential link to problems in Ethiopian flight and a Lion Air crash in 2018.
In both crashes, the aircraft of the Boeing 737 Max fought for a stable flight path. The aircraft repeatedly lost and increased in altitude before diving to the surface of the earth. In the two incidents, a new anti-stall security system was activated on the Max that controls the trim – MCAS – the sources told ABC News.
Commercial airline pilots are trained to release the system in the event of an uncontrolled trim action when the aircraft performs unexpected pitching movements. It is not known what prevented the pilots of the Lion Air flight from turning off the system and trimming the plane. Lion Air defended the training of its pilots.
In the days following the crash of Ethiopian Airlines' flight 302, airlines and aviation authorities around the world had Max. The United States was the last on March 13, after the Federal Aviation Administration completed the refined satellite data, which was completed by the United States Agency were available that day. This justified a temporary grounding of Max.
Last week, the incumbent FAA administrator went to Capitol Hill to defend the government's response to the two crashes. Daniel Elwell told Senators on Wednesday that while the FAA was one of the last aviation authorities in the world to moor Max, they and Canada were the first to make a decision based on the aircraft's robust data.
Boeing says it is working on a software update for the automated security system and is expected to be approved by the FAA and offered to the airline in a few weeks.