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Ethiopian Airlines' preliminary report shows similarities with the Lion Air disaster



Unable to stabilize the 737 Max 8 aircraft, even after following Boeing's recommended emergency procedures, the pilots attempted to repeatedly pull up the nose of the jet during the last moments of the plane, the preliminary report noted , However, the downforce of the aircraft was too great to be overcome because the aircraft's automated systems lowered its nose four times during the flight.

The captain called "pull up" three times to tell the first officer to lift his nose. Both pilots tried to pull their noses up to keep the plane running, but they could not regain control.

The problems aboard the Ethiopian Airlines flights mirror those of the cursed Lion Air flight 61

0, the similarly operated 737 Max 8 model, which crashed in October – which could be a blow to Boeing as it struggles to put the plane back into service.

The report on the Ethiopian Airlines crash does not specifically mention the Max 8's anti-8 aircraft. Stable System – Maneuver Characteristic Enhancement System (MCAS) – which is believed to have contributed to the Lion Air Disaster , Based on its findings, it is likely that the MCAS system plunged the aircraft into a dive that was fed by incorrect angle of attack sensor values.

Boeing is currently working on changing the system software. The company confirmed the similarities between the two crashes in a statement on Thursday. "The preliminary report contains information about the flight data recorder, which shows that the aircraft had a faulty input angle sensor that activated the MCAS function during the flight, as was the case during the Lion Air 610 flight," the statement said ,

Unintended MCAS activation will not happen again. Boeing has developed a software update for MCAS and a corresponding extensive pilot training and complementary training program for the 737 MAX and plans to release it. "

Prior to the release of the report, Ethiopian Minister of Transport Dagmawit Moges suggested that Boeing review" the flight control system for aircraft in terms of flight controllability. "

She told reporters in Addis Ababa that her agency was working Aviation authorities would recommend verifying that Boeing had adequately addressed "air traffic control issues" prior to releasing the aircraft for operation. "

The preliminary report, which has not yet been publicly published, does not establish a probable cause. The completion of a final report can take up to a year.

The timeline of the flight described in the preliminary report shows that the pilots' struggle for control of the aircraft was a few moments after they left the ground.

70 seconds after Start from Bole International Airport of Addis Ababa in March 10, one of the Ans Angle sensors on board the aircraft began to provide erroneous information to the aircraft's systems, indicating an imminent flight crew stoppage.

The Stabschüttler at the pilot's yoke – another system that is to warn a pilot of an upcoming stall – began to shake the yoke. The aircraft's system incorrectly sensed a stall and attempted to press its nose down four times during the flight, eventually overcoming the flight crew's ability to make the aircraft rise further.

When a problem with automatic trimming was detected, the pilots followed emergency procedures and shut down the system. Instead, the pilots tried to adjust the trim with the manual support trim wheel, but the plane was traveling too fast and the manual trim wheel would be physically impossible to operate.

Less than two minutes later, Ethiopian Airlines Flight 302 crashed, killing 157 passengers and crew.


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