PPRuNe Forums - View Single Post - Boeing 737 Max Recertification Testing - Finally.
Old 7th Sep 2020, 21:36
  #260 (permalink)  
tdracer
 
Join Date: Jul 2013
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The agreement with the authorities is that the synthetic airspeed is not required for return to service. However as part of the agreement, Boeing agreed to have synthetic airspeed available at a future specific date (I don't know the agreed to date, but it's part of the agreement).
This sort of agreement is not uncommon - particularly since (in this particular case) there is no regulation that specifies three sources, so the MAX technically is not out of compliance. No first hand knowledge, but I suspect the relevant regulation in this case is 25.1309 - which is basically a probability analysis - and hence can be open to interpretation of the probabilities.
The real question is what happens if Boeing doesn't have a workable synthetic airspeed algorithm available by the deadline...
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