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2.4  EUROCAE document ED-111 ‘Functional Specifications For CNS/ATM Ground Recording’ may lead to future amendments to this document.
Part 2 Requirements
3  Safety Objective
The recording equipment shall provide a complete, identified, intelligible and accurate record of the communications to be recorded which may be used, in the event of an incident, in any investigation by the CAA SRG Transcription Unit (960).
4  General Requirements
4.1  Minimum Performance Specification
4.1.1  Recordings shall be retained for a minimum period of 30 days from the date of the last recorded message (998).
4.1.2  Acceptable Means of Compliance: This may be achieved by means of suitably resilient internal storage, e.g. Hard Disk Drives or Solid State Drives, network Storage, removable archive media or by a combination of these.
4.1.3  The recording equipment shall comply with the Minimum Performance Specification in the Appendix (2375).
4.1.4  The manufacturer or supplier of the recording equipment may be required to provide evidence of compliance with this requirement as part of the ATS provider approval process.
4.1.5  Archive media shall be controlled and stored in a suitably secure location (2359).
4.2  Transcription Unit Equipment Compatibility
4.2.1  The Air Traffic Control Unit shall liaise with the CAA SRG Transcription Unit to ensure that the recording equipment is compatible with the replay facilities and working practices in use and shall present evidence to support this in any application for approval (962).
4.2.2  Guidance: At the initial stages when new or replacement recording equipment is being considered, it will be essential to liaise with the CAA SRG Transcription Unit, via the appropriate CAA SRG Regional Offices or other interface, to ensure that compatibility can be achieved.
4.3  Time-Recording Devices
NOTE:  Regulatory Requirements for ATS Unit Clocks are set out in Section 5 of IAS (Information and Alerting Systems).
4.3.1  Voice/Data Recording equipment shall include time-recording devices or techniques to ensure the 'time-stamping' of ATS communications (961).
4.3.2  
Time-recording devices or techniques shall use Coordinated Universal Time (UTC) and shall express each time-stamp in hours, minutes and seconds of the 24 hour day beginning at midnight (963).

5.2.2  
Communications between Flight Information Regions

CAP 670  Air Traffic Services Safety Requirements 
4.3.3  The time-recording device or technique shall be checked as necessary to ensure that 
the time-stamps are maintained within ±2 seconds of UTC or by regular reference to 
an international time standard such as the MSF signal radiated from Anthorn in 
Cumbria or from the Global Positioning System (GPS)(965). 
NOTE: ATS units may already be deriving their master time sources from these 
signals, but in both cases it is important to ensure that the output from these 
receivers is UTC. 
4.3.4  Wherever Data Link Communications are in operation, time-recording devices shall 
be accurate to within plus and minus 1 second of UTC (966). 
NOTE: In this case the time accuracy is ± 1 second and the resolution is 1 second. 
5  Communications to be Recorded 
NOTE: The CAA may require other / additional specific services to be recorded. 
5.1  Air-Ground Communications (Aeronautical Mobile Service) 
NOTE: Reference should be made to COM 02 VHF Aeronautical Radio 
Communications Equipment Paragraph 7.2. 
5.1.1  Direct pilot-controller communications between aircraft stations and aeronautical 
stations shall be recorded (967). 
　
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