The air traffic rules and procedures applicable to air traffic within the territory of Hungary conform with Annexes to the Convention on International Civil Aviation and to those portions, applicable to aircraft, of the Procedures for Air Traffic Services - Air Traffic Management - PANS-ATM (Doc 4444 - ATM/501) and the Regional Supplementary Procedures applicable to the EUR Region with the differences (printed in italics) and additional provisions listed in See GEN 1.7
In the case of operation in uncontrolled airspace or at an uncontrolled aerodrome - even if there is an AFIS unit at the aerodrome - the pilot is responsible for the safe conduct of flight operations.
Aircraft flying outside controlled airspace may be required to operate SSR transponder on a specific code. This does not mean however, that the aircraft is under radar supervision. Aircraft crossing Budapest FIR boundary shall operate the SSR transponder.