PPRuNe Forums - View Single Post - Boeing 737 Max Software Fixes Due to Lion Air Crash Delayed
Old 30th Mar 2019, 01:02
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QuagmireAirlines
 
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Originally Posted by Smythe
Did they have MCAS turned off!
They didn't need to turn it off. Not stalling. Pitch was high, yet with an empty aircraft, velocity vector was high too.
It does raise a related issue: What pitch angle and/or vertical speed should MCAS be safely disabled?
I might have implemented a disable for pitch angle < 6 degrees, and possibly add an AND condtion with vertical speed < 0 which would keep the nose from auto-trimming down when descending at a low or negative pitch angle.
What condition would you disable MCAS down-trim on? Boeing isn't buying any of that of course, yet doesn't keep us from suggesting something else.

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