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Old 7th May 2012, 16:55
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eglnyt
 
Join Date: Oct 2004
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If you are Mode S equipped and the ground unit is able to validate your downlinked aircraft identification against that in your flight plan then the Mode A code isn't needed for identification and you can be given the Mode S conspicuity code which is 1000. Not many ground units can cope with that yet but it will start to become the norm over the next few years.
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