EUR Regional Supplementary Procedures are applied. Differences are shown below:
The airspace within Budapest FIR between FL 290 and FL 410 inclusive, as described in ENR 2.1, is EUR RVSM airspace.
All aircraft operating above 9 500 FT AMSL in Budapest FIR shall be equipped with 8.33 KHZ channel spacing capable radio equipment.
Temporary exemption is granted for State aircraft to operate 8.33 KHZ channel spacing radio equipment in Budapest FIR on condition that such flight establish and maintain two way radio communication contact with the appropriate ATS Unit (Sector) on UHF frequency - in the band 225.000 - 400.000 MHZ – as instructed by ATC.
Usage of 8.33 KHZ channel spacing capability radio equipment is mandatory in airspaces within Budapest FIR where radio communication is required.
Temporary exemption is granted for State aircraft from operating 8.33 KHZ channel spacing radio equipment in Budapest FIR on condition that such flights establish and maintain two way radio communication with the appropriate ATS Unit (Sector) on dedicated VHF frequency with 25 KHZ channel spacing or on UHF frequency (in the band 225.000 - 400.000 MHZ) as instructed by ATC.
The UHF coverage extends to the airspace above 10 000 FT AMSL within Budapest FIR.
More exemptions (ref. item 18 of the flight plan):
In addition to exempted state aircraft, exemption from the 8.33 KHZ channel spacing capable radio equipage requirement is granted for those flights operating for special missions listed below. These flights are required to include the following remark(s) in the filed 18 of the FPL:
Flight Information Service
11.2. Transmission of SIGMET information
11.2.1. SIGMET information passed to aircraft cover Budapest FIR only.
11.4. Transmission of amended aerodrome forecast
11.4.1. Amended aerodrome forecasts will be passed to aircraft only on pilots’ request.