BOEING'S Possible solution to B737 MAX's control problem

Overriding Boeing 737 MAX software
Boeing is to add redundancy and other limits to its 737 MAX’s fly-by-wire software, so it is less likely to command nose-dives to counter aerodynamic stall when no such danger exists.
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 stabilizer trim switches on the outside of the yoke to temporary reverse the MCAS nose down movement.


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