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

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  • asctty
    replied
    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!

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  • giacomo892
    replied
    All FR24 receivers send RAW data to servers? This sounds very strange. There's a lot of data.

    Leave a comment:


  • moritz
    replied
    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

    Leave a comment:


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

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  • F-EGLF1
    replied
    Originally posted by pitsie View Post
    Mike, isnīt 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, 20:09. Reason: Added altimeter settings

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  • Mike
    replied
    1006 was the pressure at BCN, so for some reason it remained in the data/signal.

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  • pitsie
    replied
    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, isnīt the 1006 QNH strange though? Or am I naive in assuming that it should be 1013 when at that kind of level.

    Leave a comment:


  • Charky
    replied
    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.

    Leave a comment:


  • Cogsinister
    replied
    Originally posted by kucengemok View Post
    electronic malfunction should be considered too..we can't solely put the blame to the dead pilots...
    Oh i think we can, the co pilot was a mass murderer.

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  • kucengemok
    replied
    electronic malfunction should be considered too..we can't solely put the blame to the dead pilots...

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  • Mike
    replied
    Originally posted by dancake View Post
    ok thanks that makes sense. Is it possible that a request was sent to get data from the FMC because there was no response from the cockpit?
    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
    09:21:09Z.258 T,3c6618,42.194204,4.553450,32050,GWI18G
    09:21:10Z.208 T,3c6618,42.195923,4.555518,32050,GWI18G
    09:21:11Z.109 T,3c6618,42.197296,4.557079,32075,GWI18G
    09:21:11Z.897 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:12Z.169 T,3c6618,42.199493,4.559638,32100,GWI18G
    09:21:35Z.518 T,3c6618,42.238312,4.606330,32500,GWI18G
    09:21:38Z.418 T,3c6618,42.243130,4.612342,32550,GWI18G
    09:21:38Z.951 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:39Z.268 T,3c6618,42.244852,4.614386,32550,GWI18G
    09:21:40Z.198 T,3c6618,42.246185,4.615943,32575,GWI18G
    09:21:40Z.623 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:41Z.138 T,3c6618,42.247742,4.618003,32600,GWI18G
    09:21:41Z.325 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:42Z.068 T,3c6618,42.249135,4.619559,32600,GWI18G
    09:21:42Z.897 T,3c6618,42.250858,4.621603,32625,GWI18G
    09:21:42Z.901 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:43Z.957 T,3c6618,42.252533,4.623647,32650,GWI18G
    09:21:44Z.948 T,3c6618,42.254425,4.626056,32675,GWI18G
    09:21:45Z.215 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:45Z.413 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:46Z.864 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:46Z.877 T,3c6618,42.257375,4.629715,32700,GWI18G
    09:21:47Z.738 T,3c6618,42.258585,4.631057,32725,GWI18G
    09:21:48Z.618 T,3c6618,42.260468,4.633297,32725,GWI18G
    09:21:49Z.748 T,3c6618,42.262161,4.635544,32750,GWI18G
    09:21:50Z.212 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa
    09:21:50Z.463 MCP/FMC ALT: 38000 ft QNH: 1006.0 hPa

    Leave a comment:


  • dancake
    replied
    Originally posted by Mike View Post
    As far as I understand autopilot data is not transmitted automatically but can be requested from ground stations (ATC). The data can be picked up by anyone, the issue is to understand the data as you don't know what it means if you don't have the up-link request.
    ok thanks that makes sense. Is it possible that a request was sent to get data from the FMC because there was no response from the cockpit?

    Leave a comment:


  • Mike
    replied
    As far as I understand autopilot data is not transmitted automatically but can be requested from ground stations (ATC). The data can be picked up by anyone, the issue is to understand the data as you don't know what it means if you don't have the up-link request.

    Leave a comment:


  • dancake
    replied
    to re-phrase. Do you have a link that comfirms autopilot data is transmitted within the transponder data, or do we just have to assume the autopilot was reprogrammed?

    Leave a comment:


  • angelsevov
    replied
    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
    http://www.flightradar24.com/dvbt-stick

    http://www.rtl-sdr.com/adsb-aircraft...-with-rtl-sdr/

    http://se.mathworks.com/help/support...th-matlab.html

    http://www.rtl-sdr.com/modesdeco-now...ode-s-mode-ac/
    Last edited by angelsevov; 2015-03-26, 14:01. Reason: mac os x application

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