PPRuNe Forums - View Single Post - Aircraft intercepted near CNA last night 25/11/2011
Old 26th Nov 2011, 10:46
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HEATHROW DIRECTOR
 
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Semi-circular rule would call for, for example, eastbound FL 210, 230, 250, 270; westbound FL 200, 220, 240, 260, etc. I've never heard of off 500 ft increments being used in controlled airspace.
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