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Old 5th October 2010 | 14:01
  #1405 (permalink)  
CONF iture
 
Joined: Jan 2005
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From: W of 30W
I believe they are saying that, in normal law, the sidestick demands a load factor, and the commanded load factor did not require more than neutral elevator.
HN39,
That is correct and that is what actually happened, but I can see a major BUT here :
The load factor demand law is absolutely inappropriate to a high AoA situation, it is NOT the way the system has been engineered by Airbus. Under normal law, when the AoA becomes greater than alpha prot, the system switches the elevator control from normal mode to a protection mode in which the AoA is proportional to the sidestick deflection. It simply did NOT happen here.

The crew had to recover from a stall situation by using the usual load factor demand law, something that Airbus itself had probably never tested before …

The technical options adopted by Airbus are unbelievably complex, and one cannot realize or foreseen the consequences of deteriorated data as sent to the system and how this all concept of flight control laws and protections will interact.

The BEA, as usual, is silent on this …
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