1. FMG/5 september 2001 International Civil Aviation Organization 17th Meeting of Aeronautical Communications Panel Working Group B (ACP WG-B) Montreal, Canada 20 to 25 October 2004 and 26 to 28 October 2004 Service du Contrôle du Trafic Aérien Service du Contrôle du Trafic Aérien Typology of interferences in France VHF/Aero band in 2000 FM Radio 10 % Carriers 1 % Aero interf. 9 % Permanent transmission 7 % Wireless telephony 5 % Pirate transmission 2 % Other items 66 % WP-WGB1707A Attachment

2. Typology of interferences in France VHF/Aero band in 2001

3. COMMENTS reported pirate transmission is rather stupid joke than criminal intention Aeronautical interference stable 8% Permanent transmission=stuck microphone carriers = perm transm from the ground (generally a variant of FM perturbation) « other items » covers less disturbing and generally sporadic interferences Radar interferences (non quoted here) also trigger limitations and delays (see main text)