PPRuNe Forums - View Single Post - AF 447 Thread No. 7
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Old 12th Dec 2011, 22:49
  #634 (permalink)  
A33Zab
 
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@RRR

It's not so much the force-feedback - it's the control surface displacement feed back loop that is missing.
The F/CTL page - showing the control surfaces position - was automatically callled and in view on the System Display @ triggering of the F/CTL RUD TRV LIM FAULT (02:10:19).

Which could be in compliance with:

“c) The use of side stick controllers together with electronic flight control systems which provide control augmentation and control deflection limiting systems could affect piloting awareness that the aircraft is approaching a control limited flight condition. It may be that return to normal flight condition and/or continuing of safe flight needs a specific crew action. In these circumstances a suitable flight control position annunciation is required to be provided to the crew, unless other existing indications are found adequate or sufficient to prompt that action.
Next,

(2) CS 25.777 Cockpit controls
Side stick controller force-deflection characteristics in pitch and roll together with displacement sensitivity and gains need to be evaluated. The intention is to show that normal inputs on one control axis will not cause significant unintentional inputs on the other. Consequently a new paragraph CS 25.777(i) is proposed requiring a suitable assessment.”
Not very demanding IMO, SS is equipped with dampers, springs (Roll) & spring rods (Pitch) in all axis.
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