Old 23rd Aug 2019, 10:17
  #1998 (permalink)  
silverstrata
 
Join Date: Mar 2010
Location: L.A.
Age: 51
Posts: 555
Originally Posted by Zeffy View Post
Peter Lemme has posted a deep analysis of the differences between NG and MAX stab trim systems as well as the proposed changes:

​​​​​​Connecting the Dots: From Command to Action
Interesting analysis. He says there:

As has been described to me, Boeing will move MCAS (speed trim commands too?) to a dual architecture. In a dual architecture, each FCC has a full set of dedicated sensors to draw from; therefore no single point failure on inputs. If both FCC commands must agree for trim commands to be valid, then malfunction of one FCC can be suppressed.
Since when has aviation done anything other than dual architecture?
Who in the Boeing design team thought single architecture was a good idea?
Who in the Boeing management team thought single architecture was a good idea?
Who in the Boeing flight testing team thought single architecture was a good idea?

How did a single-channel MCAS ever get fitted to a 21st century aircraft?

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