GEN 1.5  Aircraft instruments, equipment and flight documents

1   General

Aircraft operated in Slovenian airspace shall be equipped according to the requirements and standards applied to civil aviation.

2   Operational performance of radio and air navigation equipment

2.1  The radio and air navigation equipment of aircraft shall only consist of airborne systems, instruments and components which guarantee safe and reliable operation and satisfy the technical requirements of relevant ICAO Annexes.
2.2  In substantiated individual cases the Civil Aviation Agency may grant exemptions to the following equipment requirements, provided public safety and safety of air traffic and its expeditious handling, are not impaired.

3   Radio and air navigation equipment for IFR flights

3.1  All IFR flights aircraft shall be equipped with:
  1. VHF transmitter/receivers (operating in the 117.975 to 137.000 MHz and with 8.33 kHz channel spacing capability) for air-ground voice communication.
    Exemptions from mandatory aircraft radio equipment that allows 8.33 kHz channel spacing for state aircraft are described in ENR 1.8.
  2. receiver for the signals of VORs FM immunity compliant. Only one VOR receiver is acceptable if RNAV equipment according to bullet f) of this paragraph is available and operating independently from the VOR receiver;
  3. automatic direction finder (ADF) covering the frequency range 200.000 to 526.500 kHz, with a direction indicator and audio monitoring capability, insofar as this is prescribed for the use of approach/departure procedures;
  4. one SSR transponder with capability of replying to:
    • Mode A and C or Mode S for flights bellow FL245 and
    • Mode S for flights at FL245 and above;
  5. DME interrogator;
  6. RNAV equipment with at least RNAV 5 navigation specification as far as the respective RNAV 5 is required for the specific airspace, the specific routing or the specific flight procedures.
  7. an airborne collision avoidance system - logic version 7.1 of ACAS II (required for turbine-powered aeroplanes with a maximum certificated take-off mass exceeding 5 700 kg or aeroplanes authorised to carry more than 19 passengers; aircraft, equipped on a voluntary basis with ACAS II shall have collision avoidance logic version 7.1).
3.2  For approaches utilizing the instrument landing system (ILS) aircraft shall be equipped with:
  1. one receiver for ILS localizer signals FM immunity compliant;
  2. one receiver for glide path signals;
  3. one VHF receiver with a device for indication of marker beacon signals;
  4. one indicator for ILS localizer and glide path signals

4   Radio and air navigation equipment for VFR flights

4.1  For VFR flights operating in airspace class C or class D continuous air-ground voice communications (VHF transmitter/receivers operating in the 117.975 MHz - 137.000 MHz with 8.33 kHz channel spacing capability) are required.
Radio communication capability it is not required for VFR flights, flying in airspace G and E. However, if aircraft is equipped with radio communication equipment then it is required to be equipped with appropriate communication channel spacing.
4.2  For VFR flights operating within airspace class C and/or class D and/or within transponder mandatory zones (TMZs) all aircraft shall carry and operate SSR transponder capable of operating on Mode A and C or on Mode S. Alternative provisions from the requirement to carry and operate SSR transponder capable of operating on Mode A and C or Mode S, for VFR flights, operating airspace class C or class D or within transponder mandatory zones (TMZs) are described in ENR 1.6.2 Secondary surveillance radar (SSR); chapter 2.1 General.

5   Duties of pilot, owner and operator of an aircraft

A flight may not be conducted if the radio and air navigation equipment prescribed in paragraph 2.1, paragraph 3 and paragraph 4 is not available or found to be unserviceable by the pilot.
If impairment of operational performance of the radio and air navigation equipment is found the ATC units of Slovenia Control, Ltd. may grant exemptions in individual cases, provided public safety, order and especially safety of air traffic, are not impaired. In case of unserviceability of radio and air navigation equipment parts during flight, necessary for the safe conduct of the flight and the adherence to ATC procedures, the pilot shall inform the competent ATC unit without delay.
Owners and operators of an aircraft may not permit a flight if the prescribed radio and air navigation equipment is not available.

6   Irregularities

Whoever intentionally or negligently conducts or permits a flight contrary to para 5 acts against the regulations.

7   Requirements for FM broadcast immunity of airborne receivers

7.1  Aircraft with NAV equipment not complying with the applicable interference immunity performance requirements for ILS localizer and VOR receiving systems (ref. ICAO Annex 10, Vol.I., para: 3.1.4 and 3.3.8) may not operate in LJUBLJANA FIR.
Exemptions: State aircraft with NAV equipment not complying with the above referred ICAO Standards may operate within LJUBLJANA FIR with the provision, that they are equipped with suitable other RNAV equipment (meeting RNAV 5 in accordance with ICAO DOC 7030 Regional Supplementary Procedures, EUR-RAC Section 15) for the en-route part of the IFR flight.
7.2  FM Broadcast immunity requirements regarding airborne radio communication receivers in the 117.975 -137.000 MHz band (ref. ICAO Annex 10 Vol. III Part II, para 2.3.3.) apply within the LJUBLJANA FIR.
7.3  Up to now, no interference problems have been identified in LJUBLJANA FIR by the application of the proposed ICAO Generic Method for ILS and VOR FM broadcast compatibility assessment and there have been no areas identified within the service volumes of ILS and VOR equipment, where interference to less immune aircraft receivers was above the agreed limitations of ICAO Annex 10.
7.4  Nevertheless, users are requested to report any interference problems possibly encountered during their operations within LJUBLJANA FIR to the:
Post:Agencija za civilno letalstvo
Kotnikova 19a
SI-1000 Ljubljana
Civil Aviation Agency
Kotnikova 19a
SI-1000 Ljubljana
Phone:01 2446 600+386 1 2446 600
Fax:01 2446 699+386 1 2446 699
The report should include the following information:
  1. frequency on which interference was experienced;
  2. position and altitude/height of the aircraft;
  3. aircraft registration marks,
  4. date and time (UTC) of the experienced harmful interference;
  5. description of the interfering signal (e.g. music, speech, language, other noise etc.)


Except for designated airspace where RVSM transition tasks are carried out, only RVSM approved aircraft and non-RVSM approved State aircraft shall be permitted to operate within the EUR RVSM airspace.
RVSM approved aircraft are those aircraft for which the Operator has obtained an RVSM approval, either from the State in which the operator is based, or from the State in which the aircraft is registered.
Guidance material on the airworthiness, continued airworthiness and the operational practices and procedures for the EUR RVSM airspace is provided in the ICAO EUR Regional Supplementary Procedures (Doc 7030/5 - EUR) and Commission Regulation (EU) No 965/2012.
Except for State aircraft, RVSM approval is required for aircraft to operate in the RVSM airspace within the LJUBLJANA FIR, as described in ENR 2.1.
Note: The provisions applicable to non-RVSM approved civil operations in EUR RVSM airspace where RVSM transition tasks are carried out are as specified in the ICAO EUR Regional Supplementary Procedures (Doc 7030/5 - EUR).