Mir From United States of America, joined Jan 2004, 22100 posts, RR: 55
Reply 2, posted (5 years 3 months 5 days 15 hours ago) and read 2345 times:
Quoting Faro (Thread starter): From aircraft registration sites, the impression one gets is that these codes are specific to an airframe and do not change from one operator to the another. Is this the case, and why?
It is the case, though there are now duplicate codes out there (though I think they try to separate the duplicates geographically). As for why, I'm not really sure. It shouldn't be too hard to have ATC assign the codes when necessary.
Having duplicate codes is not a big deal - even if you do have two aircraft with the same SELCAL code flying in the same airspace, all that will happen is you'll have both aircraft check in when you send a call out. You give the message to the one you wanted to, and just tell the other "sorry, wrong number".
7 billion, one nation, imagination...it's a beautiful day