PPRuNe Forums - View Single Post - AF 447 Thread No. 6
View Single Post
Old 11th September 2011 | 23:23
  #860 (permalink)  
infrequentflyer789
 
Joined: Jan 2008
Posts: 857
Likes: 0
From: uk
Originally Posted by AlphaZuluRomeo
This topic was already discussed a few pages back. From the FCOM:
When angle of attack protection is active, THS is limited between setting at entry in protection and 2° nose down (i.e. further nose up trim cannot be applied).
Basically, the idea was: why not do the same in Alt Law? (with the AoA protection remplaced by the Stall Warning, of course).
Possibly (guessing a bit) because in Alt Law you're there because things are broken, and therefore airdata (for one) may not be assumed to be as reliable.

There is a difference between giving pilots a warning (which may be ignored...) and taking affirmative action to limit or override the pilot. The latter should requrie a higher degree of confidence in the data you are acting on - and that may not be available in Alt-Law.
infrequentflyer789 is offline