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A infografia mostra como os pilotos vão poder contornar o software MCAS do Boeing 737 MA.


Contornar o software do Boeing 737 MAX

March 13, 2019 - A Boeing vai adicionar redundância e outros limites ao software do seu
737 MAX, de modo a ser menos provável que ordene mergulhos do nariz
para contrariar perdas aerodinâmicas quando esse perigo não existe.

The crashes of two Boeing 737 Max jetliners over the past five months in Ethiopia and Indonesia, killing almost 350 people in all, have resulted in the grounding of more than 300 Boeing 737 MAX 8 and MAX 9 passenger jets around the world.

Following the Lion Air flight 610 crash in October, Boeing issued a bulletin warning MAX operators that the plane’s angle of attack (AOA) sensor can produce erroneous indications causing the jet to enter an aggressive dive.

False data would trigger the anti-stall system -- known as the Maneuvering Characteristics Augmentation System, or MCAS. The pilot’s first warning would be a “stick shaker” vibrating the yoke and loud aural commands: “Airspeed low! Airspeed low!”

Bulletin TBC-19 advises that in the event of erroneous AOA data the pilot should use the stabiliser trim switches on the outside of the yoke to temporary reverse the MCAS nose down movement.

The next step, according to the Boeing bulletin, would be to reach across to the central console and flip a pair of stabiliser trim cutout switches to off. These switches would disable electric control of the jackscrew motor that moves the stabilisers up and down.

The final step is to spin two trim wheels, found on either side of the central console, to manually control the stabilisers for the remainder of the flight.

PUBLISHED: 18/03/2019; STORY: Graphic News; PICTURES: The Boeing Company