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Old 14th Mar 2019, 22:35
  #1387 (permalink)  
Join Date: Feb 2009
Location: Seattle
Posts: 379
Originally Posted by silverstrata View Post

Interesting two graphs.
And of course the 21 second interval in vertical speed cycles, equates very nicely with 10 secs of MCAS trim input and 10 sects of manual trim resetting. Prima face evidence that MCAS was operating in this flight.

We must be careful trying to read too much into very limited data. Remember that MCAS will not come active a second time until the pilot as been off of the trim input for 5 continuous seconds. For the Lion Air event data showing pilot and MCAS trim commands has been presented in that PPRuNe thread. It would be interesting to line that up with these plots to see how that particular cycle corresponded to pilot trim inputs. Hopefully we have access to the ET data soon to do the same for that event.
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