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Old 11th November 2008 | 12:55
  #3 (permalink)  
gmac1977
 
Joined: Oct 2006
Posts: 83
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From: London, UK
DX is right

a/c were expected to maintain 2000' seperation due to altimeter errors on traditional instruments, however since commercial a/c now have much more acurate altimeters RVSM equipped a/c can reduce seperation to 1000'
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