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Strange plane behavior

  1. Aug 9, 2007 #1
    Don't know if this is the right place for such a question...

    I plotted these graphs based on data taken from the black box of a plane:

    http://www.planetmobile.it/jumpjack/immagini/volo93-grafici.GIF

    I can't fully understand these data: looks like while the plane was falling down, it was also slowing down. Is this interpreataion correct? How could it be explained?
     
  2. jcsd
  3. Aug 9, 2007 #2

    Meir Achuz

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    The plane seems to have entered a tail spin, which would slow down its speed dramatically.
     
  4. Aug 9, 2007 #3

    FredGarvin

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    How do you get a tail spin from that? I would like to see some yaw port data before jumping there.

    You are looking at groundspeed, not airspeed. With a huge roll rate and pitch down it's possible that this thing is falling at a very steep rate which is shown on the altitude plot. Do you have any data on airspeed?
     
  5. Aug 9, 2007 #4
    Sorry, my mistake, I plotted GROUND speed rather than AIR speed, so I guess it's correct, being the plane going down very fast.

    Here you find full FDR data, you wanna play with them. ;-)
    http://www.crono911.net/doc0/FOIA/UA93tab.zip
     
  6. Aug 9, 2007 #5

    russ_watters

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    It just looks to me like the plane was in a mild dive, then rolled over and pitched down more steeply. Ground speed slowed because of the angle of the dive - airspeed probably went up, though not necessarily.
     
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