The two flight models that convinced the United States to suspend flights with Boeing 737 MAX

When the US and Canadian aeronautical authorities finally ordered that the Boeing 737 MAX be grounded Wednesday, after two tragedies in less than six months that left 346 dead, they did so by citing satellite information on flight patterns. both plans.

According to this information, there is reason to believe that the Lion Air 610 flight that crashed in October in Indonesia and that the Ethiopian Airlines 302 flight that crashed on Sunday fell to the ground for the same reason, according to a report The New York Times.

In particular, it refers to sudden changes in vertical speed, that is, the rate of climb and descent of altitude, measured in feet per minute, that both Boeing 737 MAX 8s have experienced. shortly after takeoff and before their crash.

The two planes were new and had been received shortly before by the airlines, and in either case, this indicates a problem with the MCAS system, which automatically corrects the oscillation of the nose of the aircraft despite the pilot's work.

In particular, Canada's Transport Minister Marc Garneau cited this information on vertical speed collected by Aireon and disseminated by Flightradar24 support your country's decision.

In particular, oscillations between ups and downs of more than 20 seconds have been taken into accountwhen the natural movements of an airplane in flight, due to turbulence and other effects, generally do not last more than eight seconds or less than one minute. What's happening in the middle of this range is hard to explain, unless it's the MCAS, said R. John Hansman Jr., professor of aeronautics at the Mbadachusetts Institute of Technology (MIT) of the New York Times.

Oscillations between 15 and 20 seconds were detected on both flights, which could suggest MCAS interference.

The investigation into what happened in Ethiopia is still ongoing, but many experts believe that the accident in Indonesia is due to this interference from the MCAS, which after receiving erroneous information regarding altitude and speed, tilted the head of the plane until it crashes.

In repecto, Don Thoma, leader of Aireon, indicated that the information collected by his company "This certainly shows that something was wrong with the plane, something that should be reviewed. "