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NOTE: Where the transmitter output power is not adjustable, and is at a level which may result in the effective radiated power permitted by the ANO Approval being exceeded, a means for reducing the power will be required to be fitted prior to operation of the equipment.
6.5 Maintenance of Aeronautical Radio Stations
6.5.1 Maintenance arrangements shall be established for equipment and systems at Aeronautical Radio Stations associated with the provision of Air Traffic Control Services (390).
NOTE: Further information is contained in APP 02.
6.5.2 Maintenance procedures shall be established for equipment and systems at Aeronautical Radio Stations associated with the provision of Flight Information Service (FIS) and Air-Ground Communication Service (AGCS). Appropriate actions shall be taken to ensure the continued compliance with the WT Act Aeronautical Radio Licence, ANO Approval and other applicable standards or requirements (391).
Recommendation: Regular functional and performance checks, including measurements to verify transmitter frequency, modulation depth, output power and a determination of effective radiated power using calibrated measurement equipment, should be undertaken (392).
6.5.3 A record of any functional test, flight checks and particulars of any maintenance, repair, overhaul, replacement or modification shall be kept in respect of the equipment and systems at Aeronautical Radio Stations, as required under ANO Article 206 (1) in accordance with Part A of Schedule 11, (1006) and the records shall be preserved for a period of one year or longer as directed by the CAA (393).
7 Specific Requirements
7.1 Communications Availability
The design, installation, operation and maintenance of equipment and systems shall be such as to ensure an availability of communications appropriate for the Air Traffic Services being provided (394).
Guidance: The availability of communications is dependent on the radio system design, including equipment configuration and power supply arrangements. The selection of equipment with the appropriate duty cycle can also reduce equipment failure. The provision of alarm / status indications is also important in ensuring that appropriate actions are taken to restore communications when a failure occurs.
7.1.1 Radio System Design
7.1.1.1 Communications of a specified quality of service shall be provided within the radio service area appropriate to the services being provided (395).
7.1.1.2 The maximum field strength outside the DOC, as specified in the frequency assignment, shall not be exceeded (396).
Acceptable Means of Compliance: Evidence to demonstrate that the defined quality of service and any other conditions associated with the frequency assignment have been met within the radio service area.
For Air Traffic Control Communications, a combination of radio service area predictions and functional tests would be acceptable. For other Air Traffic Services limited functional tests would be acceptable.
Guidance: Quality of service comprises the two aspects of signal (voice or data) quality and availability. Signal quality can be defined by signal to noise ratio or SINAD for analogue systems and by bit error ratio for digital systems. The availability can be defined in terms of a percentage of time and location.
Where co-channel and adjacent channel interference are the limiting factors, signal quality is directly related to the desired-to-undesired (D/U) signal ratio criteria used in the frequency assignment planning process, the results of which give a minimum field strength within the DOC which should be achieved and a maximum field strength outside the DOC which must not be exceeded. The signal quality at the receiver can be affected by local noise and interference effects such as man made noise and precipitation static.
NOTE: Radio system design includes the consideration of location dependent factors such as a clear radio line of sight, location of antenna, antenna type, transmitter power etc... to ensure reliable radio propagation paths are achieved.
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CAP 670 Air Traffic Services Safety Requirements 2(10)
