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7.4.3  The coverage provided by the equipment, both main and emergency, should be capable of achieving coverage within the greatest designated operational coverage at the particular unit.
7.4.4  121.500 MHz is an air traffic service frequency and as such shall be subject to off-air recording.
7.4.5  Guarding/monitoring of 121.500 MHz shall be achieved by means identified in a unit's Manual of Air Traffic Services Part 2 (2255).
7.4.5.1 Should a unit have an approved arrangement in place whereby guarding is undertaken on its behalf by another unit or facility, then the relevant safety case shall be considered adequate if that guarding can be achieved down to aerodrome circuit altitude.  Appropriate written agreements shall be put in place.
NOTE:  Attention is drawn to the Directorate of Airspace Policy Statement on 'Provision and Support of Frequency 121.500 MHz for the Purposes of Supplying an emergency Aid and Position Fixing Service'. The Policy Statement is available from the CAA website at the following link: http://www.caa.co.uk/default.aspx?catid=7&pagetype=68&gid=294.
7.5  Unintentional or Continuous Transmissions
NOTE:  Reference should be made to COM 03 Voice Communications Control Systems, RTF Communications.
7.5.1  The equipment and systems at Aeronautical Radio Stations shall not fail in a manner such as to cause unintentional or continuous transmissions (423).
7.5.2  Recommendation: New equipment and systems at Aeronautical Radio Stations should incorporate features to prevent unintentional or continuous transmissions, unless this is contrary to the intended purpose for which they have been designed (424). For existing equipment and systems, consideration should be given to incorporating such devices by retrofit, modification or add-on circuitry where appropriate (425).
The equipment and systems should conform to the 'Minimum Operational Performance Specification for devices that prevent unintentional or continuous transmissions' EUROCAE document ED-67 April 1991 [4], so far as it is appropriate for ground based systems (426).
COM 03 Voice Communications Control Systems
Part 1 Preliminary Material
1  Introduction
1.1  Under the terms of Article 205 (1) of the Air Navigation Order, any Air Traffic Service Equipment is required to have CAA approval before being established or used in the United Kingdom.
1.2  This document covers Voice Communications Control Systems (VCCS) providing communications facilities for the following categories of service described in ICAO Annex 11 Chapter 6 'Air Traffic Services Requirements for Communications':
'The Aeronautical Mobile Service (Air-Ground Communications) which uses radiotelephony and/or digital data interchange for radio communications in the VHF Aeronautical Mobile Band'.
'The Aeronautical Fixed Service (Ground-Ground Communications) which uses direct-speech communications and/or digital data interchange over radio communications links and other telecommunications media such as optical fibre and land lines'.
'The Surface Movement Control Service which uses two-way radiotelephony communications to provide an aerodrome control service for the control of vehicles on manoeuvring areas, except where communication by a system of visual signals is deemed to be adequate'.
1.3  The structure of this document has been arranged to consider these services under the broad heading of 'COMMUNICATIONS FACILITIES'. The Aeronautical Mobile Service and the Surface Movement Control Service are normally provided using radio communications and will be referred to by the description 'radiotelephony communications' abbreviated to 'RTF communications'. The Aeronautical Fixed Service incorporating telephone and interposition communications (Intercom) will be referred to by the description 'Ground-Ground Communications'. The term 'lines of communication' covers both 'RTF communications' and 'Ground-Ground Communications'.
　
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本文鏈接地址：CAP 670 Air Traffic Services Safety Requirements 2(13)