control communications (1) Worldwide frequencies for acronautical operational control communications shall enable aircraft operating agencies to meet the-obligations prescribed in Civil Aviation (Operations of Aircraft) Regulations, 2020. Assignment of these frequencies shall be in accordance with the following provisions of Appendix 27:
(a)
27/9 A world-wide allotment areca is one in which frequencies are allotted to provide long distance communications between an aeronautical station within that allotment area and aircraft operating anywhere in the world. *
(b)
27/217 The world-wide frequency allotments appearing in the tables at No. 27/213 and Nos. 27/218 to 27/231, except for carrier (reference) frequencies 3 023 kHz and 5 680 kHz, are reserved for assignment by administrations to stations operating under authority granted by the administration concerned for the purpose of serving one or more aircraft operating agencies. Such assignments are to provide communications between an appropriate acronautical station and an aircraft station anywhere in the world for exercising control over regularity of flight and for safety of aircraft. World-wide frequencies are not to be assigned by administrations for MWARA, RDARA and VOLMET purposes. Where the operational area of an aircraft lies wholly within a RDARA or sub-RDARA boundary, frequencies allotted to those RDARAs and sub- RDARAs shall be used.
CHANNELING, FREQUENCY PAIRING AND ALLOTMENT Regulation 27 and 28 (6)
TABLE 2-1; ALLOTMENT TABLE
Block allotment Worldwide frequencies poreet Remarks (MHz) utilisation
x em soe ane Specific international 118,000 - pcan na allotments will be (a) 121.450 inclusive rate ice determined in the light of ae. regional agreement.
In order to provide a guard band for the protection of the aeronautical emergency |) 121.500 Emergency frequency, the nearest t frequency assignable frequencies on ' either side of 121.500 MHz | are 121.450 MHz and 121.550 MHz.
International and | Reserved for ground | 121.550- National movement, pre-flight (4, | 121.9917 Aeronautical checking, air traffic services, inclusive Mobile clearances, and associated Services operations. National "% Acronautical Reserved for national 123.459 inclusive Mobile allotments. oe i Services
In order to provide a guard band for the protection of Auxiliary the aeronautical auxiliary 'x 123.100) frequency frequency, the nearest SAR assignable frequencies on either side of 123.100 MHz are 123.050 MHz. and 123.150 MHz.
123.150 - National 123.450 MHz which is also ny 123.6917 Acronautical used as an air-to-air inclusive Mobile communications channel Services (sec g)) 'Mim to-air Designated for use as 8) 123.450 - provided under these communications 4 Regulations
123.700 ~ International and | Specific international h) 129.6917 National f allotments will be falusive Acronautical determined in light of Mobile Services | regional agreement
129.700 - National Reserved for national i) 130.8917 Acronautical allotments but may be used a imchueive Mobile in whole or in part, subject ta Services regional agreement.
Intemational and | Specific international 130.900 - National allotments will be d 136.875 inclusive Acronautical determined in light of Mobile Services | regional agreement.
International and k) 136.900 ~ National Reserved for VHF air-ground 136.975 inclusive Aeronautical data link communications. Mobile Services
1.1 TABLE 2-2 : CHANNELING/FREQUENCY PAIRING
Frequency (MHz) Time slot eri acing Channel 118.0000 25 118.000
118.0000 Cc 25 118.003 118.0000 D 25 118.004
118.0250 A 25 118.021 118.0250 B 25 118.022
118.0250 Cc 25 118.023 118.0250 D 25 118.024
118.0250 25 118.025 118.0250 8.33 118.030 118.0333 8.33 118.035
118.0417 8.33 118.040 118.0500 25 118.050 118.0500 A 25 118.051 118.0500 B 25 118.052 118.0500 Cc 25 118.053 118.0500 D 25 118.054 118.0500 8.33 118.055 118.0583 8.33 118.060 118.0667 8.33 118.065 118.0750 A 25 118.071 118.0750 B 25 118.072 118.0750 Cc 25) 118.073 118.0750 D 25 118.074 118.0750 25 118.075 118.0750 8.33 118.080 118.0833 8.33 118.085 118.0917 8.33 118.090 118.1000 25 118.100
DEPLOYMENT OF VHF FREQUENCIES AND THE AVOIDANCE OF HARMFUL INTERFERENCE
(1)
The geographical separation between facilities operating on the same frequency shall, except where there is an operational requirement for the use of common frequencies for groups of facilities, be such that the protected service volume of one facility is separated from the protected service volumeof another facility by a distance not less than that required to provide a desired to undesired signal ratio of 20 dB or by a separation distance not less than the sum of the distances to the associated radio horizon ofeach service volume, whichever is smaller.
(2)
For areas where frequency assignment congestion is scvere or is anticipated to become severe, the geographical separation between facilities operating on the same frequency shall, except where there is an operational requirement for the use of common frequencies for groups of facilities, be such that the protected service volume of one facility is separated from the protected service volume of another facility by a distance not less than that required to provide a desired to undesired signal ratio of 14 dB or by a separation distance not less than the sum of the distances to the associated radio horizon of each service volume, whichever is smaller. This provision shall be implemented on the basis of a regional air navigation agreement.
(3)
The application of the minimum separation distance based on the sum of the radio horizon distance ofeach facility assumes that it is highly unlikely that two aircraft will be at the closest points between and at the maximum altitude ofthe protected service volume of each facility.
(4)
The distance to the radio horizon from a station in an aircraft is normally given by the formula:
D=KVh where D = distance in nautical miles; h = height of the aircraft station above earth;
K = (c Orr espond ing to an eff ectiv radius); e €eaan rth p:'s _ Tadius of4/3 999 «.<2 whe ' 5 ~ OF th n h is exp e a din metre ct 1.23 when s: and an
h js express the radio horizon with respect to emissions belonging to the service of ed in feet 1 adjacent facilities.The effect of this recommendation is to establish a geographical separation distance below which harmful interference is the radio lin e- of nt distt ance probable. ; tation, betw een the dis ance a fro Smas the station co radio mputed from The geographical separation between VHF VOLMET stations shall N ote 3 must be dio horizon ; be determined regionally and shall be such that operations free from ofthe grot In the same form d st ula is emplo harmful interference are secured throughout the protected service it 1, taking Station trans volume of each VOLMET station. mitting an tennja. : In the frequency band 117.975 - 137.000 MHz, the frequencies The a tegeo g ical sSeparat a e ati ion between fac used for National Aeronautical Mobile Services, unless worldwide annels shall be such that point tin ilities Opera s at the edge of the Ore i or regionally allotted to this specific purpose, shall be so deployed volum : e e ofof each 5} €d service that no harmful interference is caused to facilitics in the International ilit facilityy are Separated by a distanc e sufficientt Operations Aei..uautical Mobile Services. free from ha rmful interfer ence "a
The protection Any inter-State interference shall be resolved by consultation between height shall be a height above a specified associated datum the States concerned. with a particular facility, such that below it, harmful interference is iun probable. The communication coverage provided by a VHF ground transmitter shall, in order to avoid harmful interference to other stations, be kept T aa otection heig wan ay ht to- be applied to func = tion s s or to specific facilities to the minimum consistent with the operational requirements. Shall be determined r onally, taking into consider ation the following factors-
(a)
the nature of the service to be provided;
(b)
the air traffic pattern involved:
(c)
the distribution of comm unication traffi c;
(d)
the availability of frequency channels in airborne equipment; and
(e)
probable future developments.
Where the protected service volume is less than operationally desira bie. Separation between facilities operating on the same frequen cy shalledge not
be less than that necessary to ensure that an aircraft at the TOA . i
ofthe operational service volume of one facility does not come = e al
K = (c Orr espond ing to an eff ectiv radius); e €eaan rth p:'s _ Tadius of4/3 999 «.<2 whe ' 5 ~ OF th n h is exp e a din metre ct 1.23 when s: and an
h js express the radio horizon with respect to emissions belonging to the service of ed in feet 1 adjacent facilities.The effect of this recommendation is to establish a geographical separation distance below which harmful interference is the radio lin e- of nt distt ance probable. ; tation, betw een the dis ance a fro Smas the station co radio mputed from The geographical separation between VHF VOLMET stations shall N ote 3 must be dio horizon ; be determined regionally and shall be such that operations free from ofthe grot In the same form d st ula is emplo harmful interference are secured throughout the protected service it 1, taking Station trans volume of each VOLMET station. mitting an tennja. : In the frequency band 117.975 - 137.000 MHz, the frequencies The a tegeo g ical sSeparat a e ati ion between fac used for National Aeronautical Mobile Services, unless worldwide annels shall be such that point tin ilities Opera s at the edge of the Ore i or regionally allotted to this specific purpose, shall be so deployed volum : e e ofof each 5} €d service that no harmful interference is caused to facilitics in the International ilit facilityy are Separated by a distanc e sufficientt Operations Aei..uautical Mobile Services. free from ha rmful interfer ence "a
The protection Any inter-State interference shall be resolved by consultation between height shall be a height above a specified associated datum the States concerned. with a particular facility, such that below it, harmful interference is iun probable. The communication coverage provided by a VHF ground transmitter shall, in order to avoid harmful interference to other stations, be kept T aa otection heig wan ay ht to- be applied to func = tion s s or to specific facilities to the minimum consistent with the operational requirements. Shall be determined r onally, taking into consider ation the following factors-
(a)
the nature of the service to be provided;
(b)
the air traffic pattern involved:
(c)
the distribution of comm unication traffi c;
(d)
the availability of frequency channels in airborne equipment; and
(e)
probable future developments.
Where the protected service volume is less than operationally desira bie. Separation between facilities operating on the same frequen cy shalledge not
be less than that necessary to ensure that an aircraft at the TOA . i
ofthe operational service volume of one facility does not come = e al
SCHEDULE 4 Regulation 34 (1)
List of assignable frequencies shall be;
(1)
List A - assignable frequencies in regions or areas where 25 kHz frequency assignments are deployed
118.000 - 121.450 MHz in 25 kHz steps 121,550 - 123.050 MHz in 25 kHz steps -- 136.975 MHz in 25 kHz steps 123.150
(2)
List B - assignable frequencies in regions or areas where 8.33 kHz frequency assignments are deployed
118.000 - 121.450 MHz in 8.33 kHz steps 121.550 - 123.050 MHz in 8.33 kHz steps
SCHEDULE 5 Regulation 35 (3) CHANNELS FOR DME ASSOCIATED WITH MLS
Table 5-1: Channels for DME associated with MLS
Associated paired Assignment Group | DME channels VHF channels Remarks eaceaire
Would normally be used if a } EVEN 18X to ILS 100 kHz single DME F 1
56X spacings is paired with or general use ILS and is part of MLS
| EVEN I8Y to ILS 50 kHz F ; 2 56Y spacings 'or general use
VOR 50 KHZ EVEN 80Y to spacings i 3 118Y Odd tenths ofa 'or general usc MHz
ODD 17Y ta VOR 50 kHz 7 ' 4 55Y spacings 'or gencral use
For general use ODD 81Y to spacings ; Hoy Even tenths ofa MHz
6 EVEN I8W to No associated paired Brice 56w VHF channel 'or la
7 EVEN 18Z to No associated paired ao eee 56Z VHF channel use
8 EVEN 80Z to No associated paired Peat VHF channel ater use 182 9 ODD 17Z to No associated paired Fork 55Z VHF channel 'or later use
10 ODD 81Z to No associated paired re 119Z VHF channel 'or later use
GEN. EDWARD KATUMBA-WAMALA (MP), Minister of Works and Transport.
