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Old 21st Nov 2018, 11:46
  #1456 (permalink)  
FullWings
 
Join Date: Dec 2003
Location: Tring, UK
Posts: 1,410
Originally Posted by AGBagb View Post
...the Runaway Stabilizer issue has memory items - up to and including the cut-out switches and taking a firm grasp on the trim wheel - as well as the physical QRF. How many separate memory items a crew can handle at once, or in close sequence, is another issue of course: but memory items and the QRF are not one and the same thing. And it maybe that the runaway stabilizer (if that happened) was somewhat masked by (maybe...) not being flagged directly in the Unreliable Airspeed procedures (whether triggered by bad pitots, statics or AoA...).
But the big question is: how do you distinguish between normal and abnormal trim operation, given that STS/MCAS can move the stab during normal operation? What is the trigger for the Runaway Stabiliser memory items: continuous uncommanded trim movement. Was that the case here? Maybe not...
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