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Old 26th February 2004 | 23:53
  #31 (permalink)  
Flight Safety
 
Joined: Jan 2001
Posts: 739
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From: Dallas, TX USA
Wsherif1, with all due respect, I just can't follow your logic.

This link is to an NTSB accident update, dated 11/20/01.

NTSB 11/20/01 update

The press release says in part:

Based on radar data, flight 587 took off approximately 105 seconds behind Japan Airlines flight 47, a Boeing 747. The FDR indicates that flight 587 encountered two wake vortices generated by JAL flight 47. The second wake encounter occurs about 8 seconds before the end of the FDR data. For the first few seconds after the second wake encounter, the aircraft responded to flight control inputs. Both wake encounters averaged about 0.1 G lateral (side to side) movement. During the last 8 seconds of FDR data, the plane experienced three stronger lateral movements, two to the right of 0.3 and 0.4 Gs, and then one to the left of 0.3 Gs. These lateral forces corresponded in time with rudder movements. The NTSB continues to investigate the cause of the rudder movements.
At the time of this press release, you will note the NTSB believed that the wake encounters produced .1G lateral loads. They further state that later .3G and .4G lateral loads correspond in time with FDR recorded rudder movements.

I'm not aware that the NTSB has changed it's position regarding these facts. If they have changed their position, I'd be happy to examine the sources for this information.

Regards,
Flight Safety
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