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Old 03-04-2006 | 06:17 AM
  #3  
vicman
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Joined: Jun 2005
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Default 30 NM out

27,000 ft - 17,000' = 10,000 ft

drop the last three zero(e)s...= 10.

multiply by 3 and attain 30 (NM) (considering 3000 fpm and 300kts)

Derived from various aviation books/mental math section...usually works well with me.
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