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7.1.1.3 Recommendation: The Radio Service Area should be published to provide aviation users with information on the anticipated service volume within which reliable communications may be expected (397).
NOTE: Where the communications quality of service cannot easily be achieved uniformly over the service volume at the lower height limit of the Radio Service Area, an alternative is to publish the DOC and to identify areas within which the quality of service is not achieved. (See 3.1 Definitions of DOC and Radio Service Area.)
7.1.1.4 The antennas shall be installed such as to provide vertically polarised radiation (398).
7.1.2 Equipment Configuration
7.1.2.1 The equipment configuration shall be such as to ensure the availability of communications appropriate to the service being provided (399).
NOTE: The configuration of equipment includes associated antennas, cables, filters, commutation units and other equipment necessary for the operation of the equipment and systems.
Acceptable Means of Compliance:
Air Traffic Control Services – The provision of main, standby and emergency equipment redundancy together with system and location dependent redundancy measures.
NOTE: Equipment provided in addition to the above would be considered to be Contingency Equipment.
7.1.2.2 The equipment type shall be appropriate for the service being provided and be compatible with the equipment configuration (400).
Guidance: Whilst it is feasible to use transceivers and separate receivers to derive Off-Air Sidetone for Air Traffic Control and the output for Voice Recording, the lack of redundancy in the modules within typical transceivers and the likelihood of an intermittent duty cycle restriction on the transmitter and power supply mean that transceivers are not generally suitable for use in Air Traffic Control Services as main or standby equipment, although they may be suitable for emergency equipment in particular situations.
For Flight Information Services, a transceiver or separate transmitter and receiver are considered suitable as main equipment, with a hand held or portable transceiver being used for emergency equipment.
NOTE: Main and Standby equipment may be operated as 'System A' and 'System B' where either may be considered as Main whilst in operational service and the other is considered as Standby, awaiting selection in the event of failure of the Main equipment or when the Main equipment is taken out of service for maintenance.
7.1.3 Duty Cycle - Radio Transmitters / Power Supply Units
The duty cycle for Radio Transmitters and associated Power Supply Units shall be appropriate for the service being provided (401).
Guidance: Air Traffic Control Services are likely to generate peaks in use which may exceed the duty cycle of equipment rated for intermittent use and thus continuously rated equipment with a duty cycle of 100% is likely to be required. VHF Radio Transmitters used for ATIS and VOLMET obviously require continuously rated equipment.
7.1.4 Power Supply
7.1.4.1 For an Air Traffic Control Service, the power supply for the emergency equipment shall be independent of that for the main equipment (402).
Acceptable Means of Compliance: The independence of the power supplies need only be for a known limited period provided that the MATS Part 2 procedures manage the safety issues this introduces.
7.1.4.2 Users shall be provided with an indication of failure of the power supply to the emergency equipment (403) and instructions shall be provided in MATS Part 2 for user actions in the event of failure (404).
7.1.4.3 Recommendation: For an Air Traffic Control Service a primary and alternative power supply should be provided to increase the availability of power to equipment and systems in the event of an interruption to one of the power supplies (405). Change over between supplies should be on a 'no break' basis (406). The primary and alternative supplies should be independent of each other for a known period of time (407). An indication of failure for each power supply should be provided to the user
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CAP 670 Air Traffic Services Safety Requirements 2(11)
