GEN 3.4  Communication services

1   Responsible service

The Aeronautical Communication Service is provided by Slovenia Control, Ltd.
Post:Kontrola zračnega prometa Slovenije, d.o.o.
Zgornji Brnik 130n
SI-4210 Brnik-aerodrom
SLOVENIJA
Slovenia Control, Ltd.
Zgornji Brnik 130n
SI-4210 Brnik-aerodrom
SLOVENIA
Phone:04 2040 000+386 4 2040 000
Fax:04 2040 001+386 4 2040 001
Email:info@sloveniacontrol.si
URL:http://www.sloveniacontrol.si
The service is provided in accordance with the provisions contained in the following ICAO documents:

2   Area of responsibility

Communication Services are provided for entire LJUBLJANA FIR.
Slovenia Control, Ltd. is responsible for the installation, operation and maintenance of the Radio Communication and Navigation Facilities as well as for the continuous operation of all communications of the Aeronautical Fixed Services used in ATS in collaboration with the Telekom Slovenia.

3   Types of service

3.1   Radio navigation services
3.1.1  The following types of radio aids to navigation are available:
  • LOCATOR BEACON (L)
  • NON-DIRECTIONAL BEACON (NDB)
  • VHF DIRECTION-FINDING STATION (VDF)
  • VHF-OMNIDIRECTIONAL RADIO RANGE (VOR)
  • INSTRUMENT LANDING SYSTEM (ILS)
  • DISTANCE MEASURING EQUIPEMENT (DME)
  • VHF-MARKER RADIO BEACON (MKR)
  • SECONDARY SURVEILANCE RADAR (SSR)
3.1.2  The tolerances of Radio Navigation Facilities are in accordance with the provisions of ICAO Annex 10.
3.1.3  Radio Navigation Facilities are regularly flight-checked and calibrated by Slovenia Control, Ltd.
3.2   Voice and/or datalink services
3.2.1   Mobile service
The stations of the Aeronautical Mobile Service shall maintain a continuous communication with the stations on board of the aircraft during the hours of service of the ATS Units. An aircraft shall not abandon listening watch of the frequency, except in emergency, without permission of the competent ATS Unit.
3.2.2   Fixed service
The messages to be transmitted over the Aeronautical Fixed Service will be accepted only if they are in compliance with the following requirements:
  • ICAO Annex 10, Vol. II item 3.3
  • The messages shall be prepared in format as specified in ICAO Annex 10;
  • the length of an individual message does not exceed 1800 characters.
The transmission of teletype messages in the Aeronautical Telecommunication Service is performed by Ljubljana Aeronautical Telecommunication Centre and Aeronautical Telecommunication Stations at the international airports.
In general Class "B" messages are transmitted only to countries with which the Republic of Slovenia has an appropriate agreement.
3.3   Broadcasting service
The Slovene public broadcasting stations are not usable for navigational or direction finding purposes and are therefore not published in this section.
3.4   Language(s) used:
Radiotelephony communication in the Aeronautical Mobile Service is performed in the English language. The standard radiotelephony procedures and phraseology in accordance with SERA part C, ICAO Annex 10, Vol. II (Communication procedures) and Doc 4444 RAC/501/12 shall be used.
Slovenian language may be used:
  • for VFR general air traffic (GAT) in airspace E, F and G and in CTR,
  • for operational air traffic (OAT) and
  • for emergency flights.
Slovenian language may be used if public safety and order, especially the safety of Air Traffic, is not impaired.
The use of abbreviations in radiotelephony communication is not permitted. This does not apply to abbreviations which are generally understood in Air Traffic, as for example, FIR, IFR, VFR, VOR, VMC as well as the Q-roups QNH, QFE, QDM, QDR and QTE.
3.5   Where detailed information can be obtained
No information available

4   Requirements and conditions

Communication services in FIR Ljubljana are provided in accordance with Standards and Recommended Practice of ICAO and Commission implementing Regulation (EU) No 923/2012 (SERA) laying down the common rules of the air and operational provisions regarding services and procedures in air navigation as latest amended by Commission Implementing Regulation (EU) 2016/1185 of 20 July 2016 (SERA C).
Communication, Navigation and Surveillance Service Provider is Slovenia Control, Ltd.

5   Controller-Pilot Datalink Communications (CPDLC)

5.1   General
5.1.1  The CPDLC (Controller-Pilot Data Link Communications) application provides a means of communication between the controller and pilot using data link for air traffic control (ATC) communication.
5.1.2  CPDLC services are available for aircraft operating within the airspace of the LJUBLJANA FIR above FL 245.
5.1.3  The following CPDLC services are provided in LJUBLJANA FIR:
  • DLIC (data link initiation capability)
  • ACL (ATC clearances and instructions)
  • ACM (ATC communications management)
  • AMC (ATC microphone check)
5.1.4  The use of CPDLC is conducted at the discretion of ATC and at the initiative of the pilots concerned.
5.1.5  From 5 February 2020 operators shall ensure that aircraft operating GAT IFR flights in LJUBLJANA FIR above FL285 have the capability to operate the data link services defined in Annex II of Regulation EU/29/2009.
5.2   Flight Plan
5.2.1  Pilots intending CPDLC communication within the area of responsibility of LJUBLJANA ACC shall file in their flight plan in Item 10 equipment J1 and in Item 18 aircraft 24-bit address (CODE/hexadecimal).
Operators conducting flights wholly or partly in LJUBLJANA FIR, but for which Commission Regulation (EC) 29/2009 is not applicable in accordance with Article 3(3), or which aircraft types/models are exempted by Commission Implementing Decision 2019/2012, should include the letter “Z” in item 10 and the indicator “DAT/CPDLCX” in item 18 of each flight plan.
Note: Operators which voluntarily equip their aircraft in compliance with Commission Regulation (EC) 29/2009 and intend to use the CPDLC capability do not need indicate in their flight plan the status as exempted.
5.3   CPDLC Use
5.3.1  In the area of responsibility of LJUBLJANA ACC Ljubljana, voice communication and radiotelephony instructions have priority over CPDLC instructions at all times.
The clearance shall not be executed until the WILCO message has been sent. If uncertainty arises regarding a data link message, voice communication shall always be used for clarification.
If the controller is asking explicitly for a voice read back of a clearance issued via CPDLC the following phrase should be used by the pilot:
Example: “CALL SIGN – AFFIRM CPDLC CLIMB TO FL 370”
CPDLC exchanges with an LJUBLJANA ACC may only be conducted when the aircraft is under the control and responsibility of the concerned ACC.
5.4   DLIC Log on
5.4.1  The Ground facility designator for LJUBLJANA FIR is LJLA. Log-on should be initiated 10 minutes prior to entry into LJUBLJANA FIR. For aircraft departing from aerodrome LJLJ the log-on can be initiated when the aircraft is on the ground
5.4.2  Irrespective of the number of sectors crossed during flight only one log-on per flight is required within LJUBLJANA FIR.
5.5   CPDLC Services
5.5.1  ATC Clearances and Instructions (ACL) Pilots may receive the uplink messages described via data link. Pilots may request changes to flight levels (ascent or descent) via data link or clearance direct to a point on their route.
5.5.2  ATC Communication management (ACM) The pilot response to an ATC instruction to change frequency shall be WILCO. If the pilot is unable to comply with this data link instruction, he shall revert to voice communication to inform ATC.
5.6   Message Restrictions
5.6.1  Pilots shall not use free-format free-text messages when communicating with LJUBLJANA ACC via CPDLC. Use of such free-text messages will result in an error response.
5.7   Network ATN
Basis for CPDLC within ACC Ljubljana is ATN B1. Logon request ATN B1 + B2 is supported.
Data communication via FANS 1/A is not supported.
5.8   CPDLC Failure
In the case of a CPDLC failure, CPDLC clearances that have not yet been confirmed shall be repeated over radiotelephony and/or confirmed.
If the pilot or ATC is of the opinion that CPDLC should no longer be used in the given circumstances, CDPLC shall be discontinued or terminated and the other party shall be informed about this by voice communication.
In the case of a scheduled shut down or an unexpected failure of the CPDLC system, ATC will instruct all aircraft equipped with data link to return to voice communication. In the case of an on-board failure of CPDLC, the pilot shall return to voice communication and inform ATC.
5.9   CPDLC messages
The controller or pilot shall construct CPDLC messages using the defined message set. The following uplink clearances and instructions may be expected by pilots using CPDLC:
  1. ATC Uplink Clearances and Instructions used by LJUBLJANA ACC:
    • UNABLE / STANDBY
    • CONTACT (unit name) (frequency)
    • MAINTAIN (level)
    • CLIMB / DESCENT TO (level)
    • CONTINUE PRESENT HEADING
    • FLY HEADING (degrees)
    • PROCEED DIRECT TO (position)
    • MAINTAIN (speed)
    • MAINTAIN PRESENT SPEED
    • MAINTAIN (speed) OR LESS / GREATER
    • RESUME NORMAL SPEED
    • SQUAWK (code)
    • SQUAWK IDENT
    • CHECK STUCK MICROPHONE (frequency)
  2. The following request and messages may be sent by pilot using CPDLC with LJUBLJANA ACC:
    • WILCO / UNABLE / STANDBY
    • REQUEST DIRECT TO (position)
    • REQUEST CLIMB / DESCENT TO (level)
    • REQUEST (level)
    • REQUEST (speed)
    • DUE TO WEATHER / DUE TO AIRCRAFT PERFORMANCE
    • MAYDAY MAYDAY MAYDAY
    • PAN PAN PAN
    • SQUAWKING 7500

6   Miscellaneous

No information available