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Old 9th Mar 2020, 07:27
  #330 (permalink)  
A4

Ut Sementem Feeceris
 
Join Date: Jul 1999
Location: UK
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Airbus only goes into Direct Law when the gear goes down (apart from triple ADR Fault). In Alternate Law, longitudinal trim is still controlled by the FBW system - it remains very stable and easy to fly. More sensitive in role as it in now roll direct as opposed to roll rate.

The issue of pitch/thrust couple only occurs in direct law (gear down) as auto trim deals with this even in Alternate Law. There is Mechanical Back up “Law” which is a direct link between trim wheel to THS actuators (wheel NOT affected by aerodynamic load) but this is purely designed for used whilst you recover one of the 5 flight control computers (3 x SEC , 2 xELAC). I believe Airbus test pilots have landed the aircraft in mechanical back-up.

Anyway, my original post was purely to clarify that there is zero aerodynamic load effect in Airbus Side stick. What's the deal with 777/787 FBW control columns? Do they have artificial load feel?

A4

Typing at same time as Fizz57.....
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