CTHIn ForceLegislation
Civil Aviation Order 52.1 - Use of airspace - Directions under r 99AA about the use of class A airspace (31/01/2002)
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In this subsection:
approved flight level, for a track used, or intended to be used, by an aircraft, means a flight level that is listed, in the table of IFR cruising levels published in the AIP, as a flight level that may be used by aircraft flying along tracks heading in the same direction as that track.