International Civil Aviation Organization Middle East Office Seminar On Aeronautical Spectrum Management Cairo, June 2006 Agenda Item 6:- Frequency Management in AFI and MID Regions Presented by Mary Obeng RO/CNS, Dakar Office

The role of Regional Offices in Frequency Management The Regional Offices manage and coordinate with States on the utilization of :- -HF frequency band KHz which is allocated to NDBs COM LIST No.1 -VHF frequency bands MHz and MHz COM LIST No.2 -VHF frequency band MHz AM[R]S Air- Ground COM LIST No.3 All the COM LISTs are prepared and published by ICAO Western and Central African Office for AFI Region.

COM LIST No.1 The layout consist of the Introductory part, {A}, which provide means for estimating the minimum acceptable difference between the radio frequencies of two NDBs which are geographically separated by a specified distance. Part 1:- Consisting of Alphabetical list by country of Radionavigation Aids in the LF/MF Band. Page 1 of the Part 1 contains a list of AFI States and their ICAO Country Codes. The rest is the table with 9 columns.

LOCATION Freq. ID EQUIP. COORDINATES CAT COVERAGE POWER REMARKS MHz BANANKORO GK NBD 0915 N 0918 W NAT 50 W BOKE OK NDB 1058 N 1417 W NAT 50 W Column 1:The Header –The country, and the place name of the location. Column 2:The frequency of the equipment in the LF/:F band Column 3:The code designator of the facility Column 4:The type of equipment, NDB or L Column 5:The geographical co-ordinates of the location Column 6:Category of the facility ICAO –if the Implementation is in accordance AFI Air navigation Plan Operation Characteristics In accordance to Annex 10. NAT –National i.e. other categories. Column 7:This column shows the coverage in NM Column 8:Transmitter power when known Column 9:Remarks Part 2 is the list by order of frequency of the Radio Navigation AIDS.

The table is similar to the previous one, the column 1 is replaced by frequency, Column 2 by Indent, Column 3 Location of the facility. The rest of the columns are the same. ANGOLA FREQ. ID LOCATION CODE EQUIP. COORDINATES CAT. COVER. POWER REMARKS ZUV PELICAN ASO NDB 2253 S 1426 E NAT 100 POINT ZUI ROBBEN/ AFS NDB 3349 S 1823 E NAT ISLAND

Status of NDBs There is a gradual withdrawal of NDBs in AFI. New installations of NDBs are discouraged unless there is a special need like PANs OPs COM List No.2 List of facilities Operating on Frequencies in the Bands: MHz MHz The list is presented in three parts with a prelude of the relevant Annex 10 SARPs [Vol.1, Part 11, para and 4.2] dealing with the utilization of the frequencies in the band MHz and the Annex 10 guidance material concerning geographical separation for co-channel assignments. VOR should be in the band MHz

Criteria for geographical separation of VOR and/or VOR/DME in AFI Region AFI Limited RAN [COM/MET/RAC] Meeting 1988 Lome, adopted the following criteria:- a)for VORs required to serve en-route flight operations up to FL 500, geographical separation of: for co-channel 550 NM between 200 NM/FL 450 facilities for adjacent channel 220 NM. b)for VORs required for use in terminal areas 40 NM/ FL 250m geographical separation of 200 NM for co-channel and 60 NM for adjacent channel. c)for VORs required for use in final approach and landing 25 NM/FL 100 geographical separation of 130 NM and 30 NM for adjacent channel.

ILS The prelude has a list of pairs of glide and localizer frequencies to select from. Part I:- National and international assignments in Country order. Page 1 of Part I consists of AFI countries and their 3-letter codes. The table consists of 12 columns:-

ANGOLA LOCATION FREQ. ID DME EQUIP. COORDINATES CAT. COVER. HGT_RWY VOR_ILS DME-OP RMKS CABINDA VCA 90 VOR/DME O537 S 1212 E NAT 100 OP OP CATUMBELA VORNAT Column 1: The place name of the location. Column 2: The frequency in the MHz band Column 3: The identification of the equipment [ILS/ VOR] Column 4: The number of the DME or TACAN channel paired, according to the ICAO pairing plan with the VHF channel in column 2. Column 5:The type of equipment e.g. VOR, TVOR, ILS, etc Column 6:The geographical co-ordinates of the location. Column 7:The category of the facility Column 8:The designated Operational range expressed in Nautical Miles [NM] Column 9:The designated operational height expressed in thousands of for VOR DME and TACAN, for ILS this column shows the runway number. Column 10:The status of operation or date planned for Implementation of the facility Column 11:The status of operation or the date planned for implementation of the DME or TACAN Column 12:Remarks

Part II : List of National and International Assignments in frequency order FREQ. ID DME CODE LOCATION EQUIP. COORDINATES CAT. COVER HGT-RWY VOR-ILS DME REMARKS IEAL 20 ARS JEDDAH/ ILS/DME 2142N 3910 E NAT 20 34R OP OP OP CAT I KING ABDOUL AZIZE ALG ALGER/ ILS 3642 N 0313 E ICAO OP HOUARI BOUMEDIENE Column 1:The frequency of the facility i.e ILS, TVOR and VOR Column 2:The identification of the facility Column 3:The number of the DME of TACAN channel paired Column 4:The code of the country operating the facility Column 5:The place name of the facility Column 6:The type of equipment Column 7:The coordinates of the facility [as column 5 of part 1] Column 8:is as column 7 of part 1 Column 9,10, 11, is as columns 8,9,10,11 and 12 in part 1

PART III List of facilities which have been taken out of service.

COM List No.3 List of facilities operating in frequency band MHz APIRG/13 adopted the following VHF Frequency Utilization Plan in accordance with AFI/7 [ Abuja, May 1997] Recommendation 9/11.

GEOGRAPHICAL SEPARATION FOR CO-CHANNEL VHF ASSIGNMENTS Area Control or ACC – U Specified area 13700/45000 or 520 (2) Flight Information or plus 50 NM 19800/ (2) (upper) FIS – U Area Control or ACC – L Specified area 7600/ (2) Flight Information or FIS – L plus 50 NM (low) Area Control ACC – ER To be 13700/ (1) (4) Information or specified or (extended FIS – ER 9800/65000(3) 1200 (1) range) VOLMET VOLMET Omni-directional13700/45000 or 520 (2) 19800/65000(3) 660 (2) (1)Distance between Stations (2)Distance between, limits of service areas (3)If required for SST Operations (4)Applicable to the AFI Region only

Part I consists of the list of facilities in the order of States LOCATION Freq. SERVICE COORDINATES PROT GP CAT VHF OP REMARKS MHz ADRAR/ TWR 2750 N 011 W ICAO OP OP ADRAR ACC/L 3642 N 0313 E ICAO SOUTH ALGER Column 1:Country and place name of the location of the facility Column 2:Frequency in MHz Column 3:Service abbreviation Column 4:Geographical coordinates Column 5:Protection group Column 6:Category of the facility [ICAO /National] Column 7:Implementation and operational status Column 8:Remarks Part 11 consist of the list of facilities classified by the order of frequencies of operation.

AFI COM List No.3 by frequency order/ Liste AFI COM n°3 par ordre des fréquences FREQ. LOCATION CODE SERVICE COORDINATES CAT. PROT GP VHFOP REMARKS LIBREVILLE/ GAB VOLMET 0027 N 0925 E ICAO OP OP ATIS LEON MBA DURBAN/ AFIS ATIS 2958 S 3057 E NAT LOUIS BOTHA Due to scarcity of spectrum the Regional Offices are in constant dialogue with States to update the COM List so that reuse of the spectrum is possible.

Difficulties in updating the COM LISTs Inadequate information from States Constant changes in names of aerodromes Reuse of frequencies without consultation with the Regional Office.

Future Spectrum Management in AFI Promotion of ICAO positions at ITU WRCs Updating of guidance material contained in ICAO Doc 9718 Development of appropriate software to be made available to the States in order to provide them with direct and automated assistance to frequency planning, access to information and data on frequencies used. Hopefully it will lead to improved frequency utilization.