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Thread: We have analysed the raw data from the transponder of #4U9525 and found some more dat

  1. #11
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    the problem with the DF20 is that you dont know what the ATC was asking for in the UF20.
    usually you get some replies back you cannot interpret. there are some 100 registers which can be asked for.
    Its a bit like ACARS where it is hard to interpret what you receive.

  2. #12
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    Quote Originally Posted by Mike View Post
    This is still being implemented at ATC so I guess different areas can request different data or nothing at all. In this case we had the data during climb as well

    09:18:30Z.455 MCP/FMC ALT: 30000 ft QNH: 1006.0 hPa
    09:21:08Z.800 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    Mike, isn´t the 1006 QNH strange though? Or am I naive in assuming that it should be 1013 when at that kind of level.

  3. #13
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    1006 was the pressure at BCN, so for some reason it remained in the data/signal.

  4. #14
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    Quote Originally Posted by pitsie View Post
    Mike, isn´t the 1006 QNH strange though? Or am I naive in assuming that it should be 1013 when at that kind of level.
    No, that would be QNE, QNH will give you your true height above sea level and should be set to the actual barometric pressure at sea level, QNE is the international standard for defining flight levels and would be what an aircraft would be using on a defined flightpath, for determining such things as terrain clearance QNH should be used.
    Ben.

    QFE = pressure setting to read zero feet at your departure/arrival (runway)
    QNH = pressure setting to read altitude above sea level
    QNE = 'universal' setting for flight levels (1013.25)

    Additionally there would be no reason to include QNE in a data report as it is a fixed value.
    Last edited by F-EGLF1; 2015-03-26 at 20:09. Reason: Added altimeter settings
    FR24 F-EGLF1, Blitzortung station 878, OGN Aldersht2, PilotAware PWAldersht, PlanePlotter M7.

  5. #15
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    OK thanks! So as Mike says, the QNH it reports is just whatever was last entered (at BCN in this case).

  6. #16
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    Quote Originally Posted by dancake View Post
    Do you have a link to any resources that gives info on how Autopilot setting can be derived from transponder data? *there is some discussion on another forum whether this is actually possible.? Thanks for the post btw

    Hi,
    here is a pdf containing the binary format of the ADS-B messages, page 84 contains the target altitude response format.

    https://www.ll.mit.edu/mission/aviat...4_WW-15318.pdf

  7. #17
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    All FR24 receivers send RAW data to servers? This sounds very strange. There's a lot of data.

  8. #18
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    These changes to FL are not automatic and the fact that the captain is heard banging on the door followed by the PAX screaming would sugest this was not a malfunction!

  9. #19
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    It was reported on CNN an hour ago that, through a conversation the reporter had with your website, it was determined the autopilot was manually reprogrammed to reduce altitude to 100 feet "within two seconds" of reaching cruising altitude. I am not a pilot, but this does not seem corroborated by the flight history as I read it on your site - perhaps someone meant within two MINUTES?

  10. #20
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    Would it be possible for FR24 to publish the dump of the raw data relative to the flight, for the entire flight ?

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