Wien ACC (LOVV) IVAO Austria Letter of Agreement between and Effective: 15/05/2017 Edition: 1 Zagreb ACC (LDZO) IVAO Croatia 1
1. Purpose The purpose of this Letter of Agreement is to define the coordination procedures to be applied between Wien ACC and Zagreb ACC when providing ATS to General Air Traffic (IFR/VFR) and Operational Air Traffic on the IVAO Network. These procedures are supplementary to those specified in ICAO, EUROCONTROL and national documents. 2. Areas of Responsibility Vertical limits of Wien ACC, in delegated MURA Sector, are: MURA Sector FL 125 FL 660 Below FL 125 aircraft shall be transferred to Slovenia ATS provider. Lateral limits of Wien ACC are shown on the diagram below: 2
Vertical limits of Zagreb ACC are: International Virtual Aviation Organisation Above TMA Zagreb FL 205 FL 660 Below above-mentioned lower limit FL (and if above 1000 ft AGL) aircraft shall be transferred to the ATS approach unit Zagreb Radar (LDZA APP). Lateral limits of Zagreb ACC along with lateral limits of TMA Zagreb are shown on the diagram below: Red line depicts AoR between Zagreb ACC and Zagreb TMA and Ljubljana FIR airspace delegated to Wien ACC called MURA Sector (FL 125 FL 660). 3
3. ATS Units Login name Callsign Frequency LDZO_CTR Zagreb Radar 135.800 LDZA_APP Zagreb Radar 120.700 LOVV_CTR Wien Radar 134.350 LOVV_S_CTR Wien Radar 133.800 If LOVV_S_CTR is online, LOVV_S_CTR will be responsible for the MURA Sector. Otherwise, LOVV_CTR is responsible for the MURA Sector. 4. Sectorization 4.1. Wien ACC and TMAs Two sectors of Wien ACC may border Zagreb FIR through the delegated airspace MURA Sector: LOVV_CTR or LOVV_S_CTR. If LOVV_S_CTR is online, LOVV_S_CTR will be responsible for the MURA Sector. LOVV_CTR (if LOVV_S_CTR not online) 134.350 FL125 FL 660 MURA Sector LOVV_S_CTR 133.800 FL125 FL 660 MURA Sector 4.2 Zagreb ACC and TMAs Zagreb ACC has only one ACC sector (LDZO_CTR) and 1 TMA sector bordering Wien ACC delegated airspace MURA Sector (Zagreb TMA). LDZO_CTR 135.800 1000 ft AGL FL 660 D < FL 115 C > FL 115 FL 660 (outside TMAs and CTRs) LDZA_APP 120.700 1000 ft AGL FL 205 C 1000 ft AGL FL 205 4
5. Transfer of Control International Virtual Aviation Organisation Transfer of communication shall normally occur 2 (two) minutes before the aircraft reaches respective Transfer of Control point (FIR boundary), and not later than reaching the TOC point. Transfer of control occurs when the aircraft passes TOC point (FIR boundary). Transferring ATC unit is responsible for the aircraft's vertical and horizontal separation until it passes the TOC point. Traffic shall be handed over with a minimum horizontal separation of 10 nm between aircraft, maintaining this distance or increasing (if necessary on parallel headings or by using speed control) or 1000 feet vertical separation (between RVSM approved aircraft, and aircraft below FL 290) and 2000 feet in other cases. Unless coordinated via IvAc Chat or IVAO Intercom or released as specified in this LoA, the receiving ATC unit shall not give aircraft a clearance or instruction to climb or descend until it has passed the TOC point. Transferred aircraft are released for turns not greater than 45. 6. ATS Routes, Coordination Points and Flight Level Allocation 6.1. Free Route Airspace SAXFRA (Slovenian Austrian Cross Border Free Route Airspace) is available H24 throughout airspace under responsibility of Wien FIR at all altitudes above the "Lowest Available Level (LAL)" according to the Free Route Airspace charts. Cross-border FRA procedures (SEAFRA South East Axis Free Route Airspace) are available H24 from FL 325 up to FL 660 in the airspace formed from airspaces of Zagreb FIR/UIR, Sarajevo FIR and Beograd FIR/UIR excluding areas where responsibility for the provision of ATS is delegated to ATS units other than Zagreb ACC or Beograd ATCC and including area where responsibility for the provision of ATS is delegated to Zagreb ACC. 5
6.2. Cruise Flight Level Allocation 6.2.1. Flights from Zagreb ACC to Wien ACC International Virtual Aviation Organisation Waypoint designator FL Allocation Conditions OBUTI EVEN At or above FL 125 PETOV EVEN At or above FL 125 6.2.2. Flights from Wien ACC to Zagreb ACC Waypoint designator FL Allocation Conditions OBUTI ODD Above FL 125 PETOV ODD Above FL 125 6.3. Coordination for arrival/departure flights Symbol explanation: = descending to (not levelled); = climbing to (not levelled); + = above; = below 6.3.1. Flights arriving/departing Wien FIR DEST/DEP COP/TOC FL Allocation Conditions DEST LOWG OBUTI, PETOV FL 180 bdry FL 220 DEST LOWK OBUTI, PETOV FL 260 bdry FL 300 DEST LOWW OBUTI FL 260 bdry FL 300 cleared OBUTI 1W arrival DEP LOWG OBUTI, PETOV FL 210 only for flights FL125+ 6
6.3.2. Flights arriving/departing Zagreb FIR DEST/DEP COP/TOC FL Allocation Conditions DEST LDZA PETOV FL 130 bdry FL 150+ released for turn on contact DEST LDOS, LQxx, except LQBK ALL FL 350 at level DEST LQBK ALL FL 230 bdry FL 250 DEP LDZA OBUTI FL 180 bdry FL 125+ released for turn and/or max FL200 on contact 7. VFR Flights Unless specially authorized by the respective ACC, VFR flights shall not be operated above FL 195. Such special approval shall not be granted for enroute VFR flights. For departure and arrival from/to controlled and uncontrolled airports VFR traffic shall use VFR reporting points prescribed on the charts and/or, for Zagreb FIR, in the VFR Manual Croatia. 8. Validity This Letter of Agreement becomes effective 15/05/2017, and supersedes any previous Letter of Agreement between Wien ACC and Zagreb ACC. m.p. Stefan Kleiss AT-AOC m.p. Marko Bošnjak LDZO-CH Date: 29/04/2017 7
A.1 Definitions ATS Area of Responsibility An airspace of defined dimensions where a sole ATS unit has responsibility for providing air traffic services. General Air Traffic (GAT) All flights which are conducted in accordance with the rules and procedures of ICAO and/or the national civil aviation regulations and legislation. Operational Air Traffic (OAT) All flights which do not comply with the provisions stated for GAT and for which rules and procedures have been specified by appropriate national authorities. Reduced Vertical Separation Minimum (RVSM) A vertical separation minimum of 300 m (1 000 ft) which is applied between FL 290 and FL 410 inclusive, on the basis of regional air navigation agreements and in accordance with conditions specified therein. Release for Climb An authorization for the accepting unit to climb (a) specific aircraft before the transfer of control. Note: The transferring unit/sector remains responsible within its Area of Responsibility for separation between the transferred aircraft and other aircraft unknown to the accepting unit/sector, unless otherwise agreed. Release for Descent An authorization for the accepting unit to descend (a) specific aircraft before the transfer of control. Note: The transferring unit/sector remains responsible within its Area of Responsibility for separation between the transferred aircraft and other aircraft unknown to the accepting unit/sector, unless otherwise agreed. Release for Turn An authorization for the accepting unit to turn (a) specific aircraft away from the current flight path by not more than 45 before the transfer of control. Note: The transferring unit/sector remains responsible within its Area of Responsibility for separation between the transferred aircraft and other aircraft unknown to the accepting unit/sector, unless otherwise agreed. 8
A.2 ATS Airspace Classification within Zagreb FIR 9
A.3 SEAFRA Index Chart MURA Sector and Zagreb FIR Border Description of symbols: E = entry point; X = exit; A = arrival; D = departure; I = intermediate 10
A.4 SAXFRA Index Chart including LAL MURA Sector Description of symbols: E = entry point; X = exit; A = arrival; D = departure; I = intermediate; LAL lowest available level within SAXFRA 11