PPRuNe Forums - View Single Post - AF 447 Thread No. 9
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Old 8th Aug 2012, 18:20
  #1119 (permalink)  
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Join Date: Jun 2009
Location: florida
Age: 81
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C'mon, Doze, the pilot does not "command" the THS. The THS moves to reduce stick inputs for the commanded gee. HAL does this, not the pilot unless in one of the myriad of control laws.

As I recounted in an earlier post, our primitive FBW system was a gee command like the 'bus until we hit the AoA bias/limit. You could "trim" for two gees and due to the awesome visibility look back to see what the hizontal stabs were doing. The suckers would tilt down to get the nose up, then settle out until reaching the AoA limit ( "protection", if you will). In short, we had a full-time THS that tried to get to our trimmed gee, not AoA. At the AoA limit the stabs would then move the other direction to keep the AoA under 27 degrees or so until they were fully deflected for nose down pitch. Result was trimmed gee or one gee and max AoA, and falling like a rock.

My feeling is that all 'bus drivers need to see what HAL is doing to "help" them from getting into problems. All the "help" can hurt you when flying where you are not used to.
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