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I have added this page despite the fact that I haven't used this rule for 15 years and can't quite remember the details. I thought it was best to get something down since it was mentioned in the air navigation section and a link was given to an empty page. Please change or add to this in keeping with what you have been taught or what you teach.
-- CloudSurfer 19:06, 13 Sep 2004 (UTC)
During several automated bot runs the following external link was found to be unavailable. Please check if the link is in fact down and fix or remove it in that case!