The carriage and operation of 8.33 kHz radio equipment applies to which airspace?
Since October 1999, the carriage and operation of 8.33 kHz radio equipment applies above FL245 in the ICAO EUR Region. From 15 March 2007, the carriage and operation of 8.33 kHz radio equipment applies above FL195 in the ICAO EUR Region. Any exemptions – which are expected to be minimal – should be described in State Aeronautical Information Publication (AIP).