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Old 7th Feb 2010, 06:37
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MrApproach
 
Join Date: Aug 2001
Location: Australia
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In Australia the Eurocat-X system assigns codes automatically when filed flight plans become "pre-active", 45 minutes before ETD. These are displayed to controllers in the Electronic Strips. Hence if you are flying into an Aussie FIR with a code you will be asked to change it.

The reason being that the code that was available in the previous FIR may not be available, that is it is already being used, in the receiving FIR. Everyone is striving for seamless transfers however the limited number of SSR codes makes that very difficult.

When we finally move to a world wide ADS-B system each aircraft can be identified by it's 24 bit ADS-B code so I think transponders may become obsolete.
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