This is an accident with very rare circumstances, likely never encountered before. In the order of 10 to minus 9 power: extremely improbable but with catastrophic consequences.
Chances are that the combinations making this happen are conditions that have never made it to the list of required DFDR parameters.
My guess is that if they find the cause to be a unique set of circumstances, the list of recorded parameters will possibly once again be extended.
As an example, such was the case when the B737 rudder PCU servo-valve had been identified as the cause of several accidents.
In case of the 737 rudder problem the conception was also that all swans were white, until presence of a black swan (the PCU) was identified.
Green-dot
Last edited by Green-dot; 19th Apr 2008 at 07:15.