1. 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

2. 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.

3. 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.

4. Column 1: The Header –The country, and the place name of the location.
LOCATION Freq ID EQUIP. COORDINATES CAT COVERAGE POWER REMARKS
MHz
BANANKORO GK NBD N 0918 W NAT W
BOKE OK NDB N 1417 W NAT 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.

5. ANGOLA 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 S 1426 E NAT POINT
ZUI ROBBEN/ AFS NDB S 1823 E NAT ISLAND

6. Status of NDBs There is a gradual withdrawal of NDBs in AFI
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

7. 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:-
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.
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.
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.

8. 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:-

9. ANGOLA LOCATION FREQ. ID DME EQUIP. COORDINATES CAT. COVER
ANGOLA LOCATION FREQ ID DME EQUIP COORDINATES CAT. COVER. HGT_RWY VOR_ILS DME-OP RMKS CABINDA VCA VOR/DME O537 S 1212 E NAT OP OP CATUMBELA VOR NAT
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

10. Part II : List of National and International Assignments in
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 ARS JEDDAH/ ILS/DME N 3910 E NAT R OP OP OP CAT I KING ABDOUL AZIZE ALG ALGER/ ILS 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

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

12. 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 .

16. GEOGRAPHICAL SEPARATION FOR CO-CHANNEL VHF ASSIGNMENTS
Area Control or ACC – U Specified area /45000 or (2)
Flight Information or plus 50 NM / (2)
(upper) FIS – U
Area Control or ACC – L Specified area / (2)
Flight Information or FIS – L plus 50 NM
(low)
Area Control ACC – ER To be / (1) (4)
Information or specified or
(extended FIS – ER /65000(3) (1)
range)
VOLMET VOLMET Omni-directional 13700/45000 or (2)
19800/65000(3) (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

17. 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 N 011 W ICAO OP OP 06-18
ADRAR ACC/L 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.

18. Due to scarcity of spectrum the Regional Offices are in
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 N 0925 E ICAO OP OP ATIS
LEON M’BA
DURBAN/ AFIS ATIS 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.

19. 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.

20. 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.