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Old 4th Aug 2014, 00:32
  #26 (permalink)  
DozyWannabe
 
Join Date: Jul 2002
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@Winnerhofer:

Same deal with the Airbus BUSS and Backup ALT.

Airbus backs up speed and altitude displays - 3/28/2006 - Flight Global



Presumably the B787 system also has the same restrictions regarding use.
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