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Science Forum Forum Index » Engineering & Transportation » Emergency Transponder Codes on Aircraft

  
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angrysoba
Posted: Tue Feb 26, 2008 11:07 pm    Post subject: Emergency Transponder Codes on Aircraft Reply with quote

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I have heard that passenger aircraft transponders are able to signal to Air Traffic Control that they are being hijacked if the pilot or co-pilot keys 7500 into the transponder. Sometimes the failure of any of the flightcrew on any of the planes to do this on 9/11 is seen as evidence of a conspiracy. Does anyone know when emergency codes were introduced to commercial airliners?

I've tried looking for this information on the Internet but nothing satisfactory has shown up yet.
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Pumblechook
Posted: Thu Feb 28, 2008 4:43 pm    Post subject: Reply with quote

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Dunno.

I went into a big British CAA ATC radio site in the about 1990 and was quite shocked. The equipment looked like it dated back to the 50s.
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