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Old 30th Aug 2011, 04:14
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mm43
 
Join Date: Jun 2009
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The following is a combination of FDR traces posted in a format used to convey the data that HazelNuts39 had originally constructed from the BEA's initial report on the FDR data.

These copied traces have used the highest resolutions available and also have a Smoothed Normal Acceleration curve added to give an indication where the +/- 'g' forces were. From the commencement at 02:10:51.4 of the Stall Warning, thin dotted lines showing the 'smoothed' traces for both the AoA and Pitch Attitude angles are included.

CLMAX occurred at 02:10:56.5, and the 'g' break within a further second. Some post stall pitching oscillations matched by the AoA values took place for a few more seconds before the AoA rapidly moved toward 30 degrees and the FPA moved into negative territory.

Back earlier at the AP and ATHR disconnect(s), the traces are rather 'lumpy' - an artifact of the turbulence occurring as the aircraft commenced the initial climb.

The Initial Stall Analysis is here, and HN39's description of how the initial data was constructed is in AF447 - Thread No.5 - post #70

Last edited by mm43; 5th Sep 2011 at 19:34. Reason: Revised graphic & stall description
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