For starters, when MCAS detects a pre-stall event (real or perceived) it is supposed to begin the process of pointing the nose down only until a pilot manually overrides it — but it will try again every few seconds
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The day before the Ethiopian Airlines crash, passengers and crew reported what sounds like a thoroughly horrifying ride in which the aircraft kept climbing and diving in a sort of rough sinusoidal pattern throughout the flight.
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Based on preliminary reports from ground crew and investigators, this is believed to have been caused by the MCAS system responding to perceived stall events caused by malfunctioning Angle of Attack (AoA) sensors.
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When pilots resisted MCAS’ automatic dive & accelerate routine, it would kick back on a few seconds later, resulting in those wild flight oscillations.
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important notes ❶ the comments about the flight oscillations on flights leading up to the crash pertained to the Lion Air aircraft, not that of Ethiopian Airlines (mea culpa)
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❷ not only is it way too early to conclude what brought down Flight ET302, even the Lion Air Flight 610 crash is still formally under investigation and will likely continue to be so for several months
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❸ I am — somewhat obviously — not an FAA investigator; nor an avionics engineer, nor a pilot
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The major impetus behind this thread was me reading about MCAS and the abysmal way it was introduced to pilots (i.e., in some cases, not at all).
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Those arguing whether any MCAS-linked crash should be chalked up to computer error or human failure are largely missing the point.
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Those arguing that the Lion Air and Ethiopian Airlines crashes only happened due to poor training in those carriers’ respective countries are racist. Sorry, I don’t make the rules. ¯\_(ツ)_/¯
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