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Here you can find information and procedures for operating inside Zagreb FIR

TRANSITION ALTITUDE for all airports in Zagreb FIR is the same and it is 10,000 ft (3030 m).
TRANSITION LEVEL is provided by approach control and it is calculated according to the following table:

Transition Level by QNH
QNH (hPa) 960-977 978-995 996-1013 1014-1031 >1032
TRANSITION LEVEL FL 125 FL 120 FL 115 FL 110 FL 105
 

QNH for arriving traffic will be given by approach controller together with the first clearance for descent below transition level.
QNH for departing traffic will be given by tower controller usually with start up clearance, and latest with taxi clearance.

Frequencies used in Zagreb FIR

Station name Frequency ICAO
Zagreb Radar 135.800 LDZO_CTR
Zagreb North Control 132.125 LDZO_N_CTR
Zagreb Adria Control 135.800 LDZO_WS_CTR
Zagreb Information 135.050 LDZO_FSS
Zagreb Ground 121.850 LDZA_GND
Zagreb Tower 118.300 LDZA_TWR
Zagreb Radar 120.700 LDZA_APP
Split Tower 124.675 LDSP_TWR
Split Radar 120.875 LDSP_APP
Dubrovnik Tower 129.500 LDDU_TWR
Dubrovnik Radar 123.600 LDDU_APP
Pula Tower 132.000 LDPL_TWR
Pula Radar 124.600 LDPL_APP
Rijeka Tower 119.000 LDRI_TWR
Zadar Tower 123.700 LDZD_TWR
Zadar Radar 128.525 LDZD_APP
Osijek Approach 118.800 LDOS_APP
Brač Tower 118.025 LDSB_TWR
Lošinj Tower 120.300 LDLO_TWR
GUARD 121.500 GUARD
UNICOM 122.800 UNICOM
Croatia Military 124.800 LDZO_M_CTR
Zadar Military Radar 119.600 LDZD_M_APP

Squawk codes used in Zagreb FIR

Flight Rules Type Dep-Arr SQUAWK
IFR International Croatia-World 6520-6547
IFR Domestic Croatia-Croatia 7020-7077
IFR Transit World-World 6550-6577
VFR Domestic Croatia-Croatia 7020-7077
VFR International World-World 0030-0047
MIL Military World-World 0050-0077
  Emergency   7700
  Lost communications   7600
  Hijack (not allowed on IVAO)   7500

 

Zagreb FIR Sector Manual

Download Manual

This manual is intended to be used by air traffic controllers on the IVAO network when controlling in Zagreb Flight Information Region (LDZO FIR). The manual provides information regarding operating procedures and standard practices in Croatian airspace.  

 

Zagreb FIR Voice Communication Procedures Manual

Download Manual

This manual is intended to be used by air traffic controllers and pilots on the IVAO network when controlling and flying in Zagreb Flight Information Region (LDZO FIR). The manual provides information regarding voice communication procedures and standard practices in Croatian airspace. 

 

Squawk generator for Zagreb FIR using IVAC1

http://squawk.scumari.nl/ldzo-sq.php

This page is written to get unique squawk codes in a control area.
Connect to the generator with your IVAO VID when logged on as ATC.