PPRuNe Forums - View Single Post - MCAS ALTITUDE V ATTITUDE ??
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Old 15th Mar 2019, 19:55
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Join Date: Jun 2009
Location: florida
Age: 81
Posts: 1,611
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Salute Conso !!

Yep, although we had a great discussion and got into the technical stuff about MCAS and such about 4 months ago, it may be time to refer newbies here or back to the original thread that arose due to JT610.

Before logging, the ALTITUDE, as well as temperature, is part of the mach value used by MCAS. So in a roundabout way altitude is there for the MCAS magnitude of down trim component ccording to available info.
Tough to analyze something that is a kludge to begin with, and then the inputs to the kludge may have "back doors" the sftwe folks had not thot of. The stability problem was an aerodynamic one that Boeing tried to correct with a "simple software"doofer. But the fix used the aerodynamics of the hozontal stabilizer controlled by a new sftwe module in the FCC, and the fault tree analysis was "faulty"!!!!

I can tellya that having the stick/wheel feel get light as you approach a stall AoA is not good. And then, if you pull back just a tad longer the nose continues to rise all by itself.

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