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Old 22nd Dec 2012, 03:30
  #87 (permalink)  
DozyWannabe
 
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Originally Posted by Lyman
"Nomal Law" with all protections, gets a grade of "A". Anything else, missing one or more "protections" is sub standard in quality, iow, unprotected, the dummy flying can now make a blunder that the system will have prevented in "A" mode.
With equal respect, such an opinion can only be advanced if one believes that the design of the system was predicated on limiting human involvement in flying the aircraft. While it seems to be a difficult notion to shift in some quarters, the fact is that it is utterly untrue.

The reason for considering control laws outside Normal "degraded" is for no other reason than they were designed to come into effect in the event of a technical or structural failure in the aircraft and its systems. The concept is no different than older designs in the event of, say, partial hydraulic loss where the working systems provide a degree of control, albeit in a degraded manner.

In this case, the temporary workaround published by Airbus is in effect simulating dual ADR failure, which will cause the flight law to degrade to Alternate.

* - Hmm, seems like Lyman's post disappeared...

Last edited by DozyWannabe; 22nd Dec 2012 at 03:38.
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