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2 Scope
This document sets out the engineering requirements for VCCS communications facilities established or used at locations within the United Kingdom providing Air Traffic Services.
3 References
1) ICAO Annex 11 — Air Traffic Services.
2) ICAO Annex 10 Aeronautical Telecommunications Volume III -Communication Systems Part I - Digital Data Communication Systems; Part II - Voice Communication Systems.
Part 2 Requirements
4 Safety Objective
The VCCS shall enable direct, rapid, continuous and intelligible two-way voice communications for Air Traffic Services (1087).
5 General Requirements
5.1 International Standards
5.1.1 The equipment, systems, services and facilities shall comply with the applicable international standards, recommended practices and procedures for air navigation services in Annex 10 [2] and Annex 11 [1] to the Convention on International Civil Aviation (1088).
6 Communications Facilities
6.1 General
6.1.1 The operator shall have clear visual and audible indication of the status of all available lines of communication (1090).
6.1.2 The operator shall have the ability to select or deselect independently lines of communication or facilities in any combination, without affecting the operation of other lines of communication or facilities available at that or any other position (1091).
6.1.3 Where the system configuration can be changed, a means of quickly restoring the last set option configuration before any failure shall be provided (1092).
6.1.4 Recommendation: Operator workload should be reduced to a minimum by implementing functions with single keypress operation where practicable (1093).
6.1.5 Headsets shall be provided except at units with very low density operations where loudspeaker and free-standing microphone (i.e. no headset capability) may be authorised (1094).
6.1.6 Recommendation: Loudspeaker and headset earphone volume should be audible at the operating position when set to their minimum level (1095).
NOTE: The air-ground communications may be switchable between headset and loudspeaker as traffic conditions dictate.
6.1.7 Recommendation: Headsets are the preferred audio interface equipment and should be configured to operate in split mode (1096).
NOTE 1:Split headset mode implies the following:
RTF Communications only – Transmissions heard in both earpieces. RTF Communications and Ground-Ground Communications – RTF transmissions heard in one earpiece and Ground-Ground Communications heard in the other earpiece. When the operator makes an RTF Communications transmission sidetone is heard in both earpieces.
NOTE 2:Handsets, desk or hand microphone may be used in combination with the desk loudspeaker where the ambient noise or traffic levels permit such operations.
6.1.8 Operating positions shall have a loudspeaker which will allow selected lines of communication to be monitored (1097).
6.1.9 Recommendation: Operating positions should have provision for the connection of a number of headsets enabling instructor/student, dual operator and supervisor monitoring facilities (1098).
6.1.10 The instructor/student facility, where provided, shall enable direct communications via headsets (1099).
6.1.11 The instructor/student facility, where provided, shall enable the instructor to interrupt any student communications at any time (1100).
NOTE: The instructor/student interrupt may be achieved by use of a dedicated instructor PTT Press-To-Talk control incorporating separate switches for RTF Communications and Ground-Ground Communications.
6.1.12 Operating positions shall have provision for at least two momentary action PTT controls, one of which shall permit 'hands-free' operation (1101). The controls shall be used to control RTF Communications transmissions (1102).
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CAP 670 Air Traffic Services Safety Requirements 2(14)
