4.2.1  Category I (CAT I) operation

A precision instrument approach and landing with a decision height not lower than 60 M (200 FT) and with either a visibility not less than 800 M or a runway visual range not less than 550 M.

4.2.2  Category II (CAT II) operation

A precision instrument approach and landing with a decision height lower than 60 M (200 FT), but not lower than 30 M (100 FT) and RVR not less than 350 M or 300 M (for aircraft conducting an autoland).

4.2.3  Category IIIA (CAT IIIA) operation

A precision instrument approach and landing with:

1. a decision height lower than 30 M (100 FT) or no decision height; and
2. RVR not less than 200 M.

4.2.4  Category IIIB (CAT IIIB) operation

A precision instrument approach and landing with:

1. a decision height lower than 15 M (50 FT) or no decision height; and
2. RVR less than 200 M but not less than 50 M.

Note: Where decision height (DH) and runway visual range (RVR) fall into different categories of operation, the instrument approach and landing operation would be conducted in accordance with the requirements of the most demanding category (e.g. an operation with DH in th erange of CAT IIIA but with an RVR in the range of CAT IIIB would be considered a CAT IIIB operation or an operation with a DH in the range of CAT II but with an RVR in the range of CAT I would be considered a CAT II operation).

4.2.5  Low visibility take-off (LVTO)

A term used by the Joint Aviation Authorities in relation to flight operations referring to a take-off on runway where the RVR is less than 400 M.

4.4.1  Physical Characteristics

Runways and taxiways of aerodromes are designed and operated according to the Standards and Recommended Practices laid down in ICAO Annex 14 appropriate to the category of their certified operation.

At present Low Visibility Operations are available only at Aerodrome Ljubljana (LJLJ)

• CAT II/III approach and landing RWY 31
• Low visibility take-off RWY 13 and RWY 31

4.4.2  Obstacle Clearance Criteria and Obstacle Free Zone (OFZ)

The aerodromes and the airspace around the aerodromes are kept free of obstacles rising above the precision approach obstacle limitation surfaces as defined in ICAO Annex 14, chapter 4 and Document 8168 PANS-OPS, Volume II. An object which penetrates one of the obstacle limitation surfaces becomes the controlling obstacle for calculating the OCA/OCH.

During CAT II or CAT III Operations the Obstacle Free Zone (OFZ) is kept clear of all obstacles, such as vehicles, persons and aircraft at all times when an aircraft making an approach is below 200 FT GND.

Essential equipment and installations in the vicinity of the runway which are necessary because of their function for air navigation purposes (e.g. GP antenna, RVR assessment units, etc.,) are situated clear of the OFZ and of minimum mass and frangibly mounted.

4.4.3  Pre-Treshold Terrain

A Precision Approach Terrain Chart according to the Standards and Recommended Practices of Annex 4 and 14 is provided for each runway certified for CAT II and CAT III ILS Operations; the charts are included in section AD 2.24 of the aerodrome concerned.

4.5.1  Approach lighting

Approach lighting for precision approach runways is in compliance with Standards and Recommended Practices laid down in ICAO Annex 14.

For detailed description of the approach lighting system see section AD 2.14 of the aerodrome concerned.

4.5.2  Runway Lighting and Marking

Runway lighting and marking is in compliance with the Standards and Recommended Practices laid down in ICAO Annex 14.

Runways certified for CAT II and CAT III ILS Operations are equipped accordingly including runway threshold lighting, runway edge lighting, runway end lighting and marking, runway centre line lighting and marking and touch down zone lighting and marking. For detailed description of the Runway Lighting and Marking see section AD 2.14 of the aerodrome concerned.

4.5.3  Taxiway Lighting and Markings, Stopbars

Taxiway lighting and marking is in compliance with the Standards and Recommended Practices laid down in ICAO Annex 14.

Stop bars, taxi-holding positions and illuminated notice boards are installed to provide adequate clearance for taxiing aircraft from the runway.

Taxiways leading to or from runways intended to be used during CAT II and CAT III weather conditions are equipped with TWY centre line lights. TWY centre line lights within the LOC sensitive area are colour coded (yellow/green) in order to advise the pilot exiting the runway when the aircraft is clear of LOC sensitive area.

4.5.4  Secondary Power Supply

Secondary power supply (switch over time is 1 second) for the Visual Aids is provided in accordance with the requirements of ICAO Annex 14.

Remark: Any failure of the secondary power supply equipment is effecting a down-grading of ILS Operations.

4.6.1  Equipment

ILS ground equipment serving instrument runways are no-break power supplied dual systems and located and operated according to the Standards and Recommended Practices laid down in ICAO Annex 10, Volume I, part I, chapter 3, item 3.1.

Automatic monitor systems according to the requirements of Annex 10, Volume I, part I are provided for all ILS ground systems components. LOC certified for CAT II and/or CAT III operations are additionally monitored by a far-field monitor. Pilots will be informed without delay about any deficiency.

Flight inspections are conducted in regular intervals and in accordance with the guidelines of ICAO Document 8071.

4.6.2  ILS Sensitive Areas

A sensitive area for localizer protection is established.

For ATC purposes the LOC sensitive area is defined as a rectangular area which is located within parallel lines 150 metres on both sides of the runway centre line and between the localizer aerial and the beginning of the runway.

During CAT II or CAT III operations the ILS sensitive area is kept clear of all vehicles and aircraft at all times when an approaching aircraft is within 2 NM from threshold until it has completed its landing run and at all times that an aircraft taking off is using the ILS localizer for guidance during take-off run.

4.6.3  Secondary Power Supply

All radio navigation aids, essential communication equipment and the RVR assessment system are no-break power supplied.

4.7.1  Aerodrome services

Maintenance and inspection of the visual aids, runways and taxiways is done in regular intervals by aerodrome operator.

Maintenance an inspection of the non-visual aids is executed by Technical department of Slovenia Control, Ltd.

4.7.2  Aeronautical Information Services

Under normal circumstances pilot may expect that facilities provided for all-weather operations to the particular runway are operative.

Any change in operational status or any other deficiency, if caused by a failure expected to last more than one hour, will be promulgated by NOTAM; pilots will be informed accordingly by ATC and/or ATIS.

4.7.3  Meteorological Service

Accurate and timely reporting of meteorological conditions at the aerodrome concerned according to ICAO Annex 3 is provided.

Runway Visual Range (RVR) is normally assessed by electronic transmissiometers; position of transmissiometers at touch-down zone, mid-point and stop-end of the runways are on the aerodrome chart designated as position A (touch down), B (mid point) and C (runway end) respectively and indicated on the aerodrome chart (AD 2.24) accordingly.

If the TDZ RVR assessment unit fails, the RVR value from the mid-point will be transmitted.

4.8.1  Aircraft and Equipment

Basic requirements for an aircraft and its equipment for CAT II and CAT III operations are described in chapter 4.2 of the ICAO Doc. 9365-AN/10 — Manual of All Weather Operations.

Competent Authority for aircraft registered in Slovenia is the Ministry of Transport, Civil Aviation Directorate (DCA) .

4.8.2  Flight Crews

Training and experience requirements for flight crews to operate at low minima are described in chapter 4.3 of the ICAO Doc. 9365-AN/10 — Manual of All Weather Operations.

Competent Authority for aircraft operators registered in Slovenia is the Ministry of Transport, Civil Aviation Directorate (DCA) .

4.9.1  General

Training flights simulating low minima approaches have to be announced on initial call with approach control using the phrase "REQUEST PRACTICE CAT II/III APPROACH". Depending on traffic situation permission will be granted whenever possible.

Procedures will be applied only if traffic permits. Departing or preceding landing traffic may disturb ILS signals. Under weather conditions better than CAT II/III, the secondary power supply for the visual approach aids prescribed for CAT II/III operations will not be operated .

4.10.1  Domestic Operators

Domestic operators wishing to carry out CAT II/III operations shall apply by writing for the approval of CAT II/III operations.

4.10.2  Foreign Operators

Foreign operators will obtain the authorization after submittion of the copy of approval delivered by the authority of the state of registry.

4.10.3  Applications shall be addressed to: