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5.4 At ATS Units where the surveillance data displayed is obtained from either ADS or multi-lateration systems, the screen shots shall be recorded with no loss of accuracy or detail and at a rate equal to the update rate of the surveillance data source.
5.5 At ATS Units where the surveillance data displayed is obtained from a radar sensor (or sensors), the screen shots shall be recorded at a rate not less than twice the maximum rotation rate of the radar sensors employed to provide the surveillance data.
5.6 The surveillance data recording system deployed at an ATS Unit shall not degrade or otherwise adversely affect the performance of the surveillance processing and display systems employed at that ATS Unit.
5.7 The surveillance data recording system and power supply configuration shall ensure the continued availability of the recording process, without interruption, whenever the ATS Unit is providing an air traffic service (see Section 12).
5.8 The surveillance recording system shall include time-recording devices or techniques to ensure the accurate "time-stamping" of ATS data using a common time source. (See Section 11).
5.9 Surveillance data recorded either at the ATS Unit or by a third party provider (see Section 7) shall be retained in secure storage for a minimum period of thirty days or longer if the recordings are pertinent to the investigation of an air accident or incident (see Section 15).
5.10 The surveillance recording and replay system shall be capable of supporting the time-synchronised replay of voice and surveillance data recorded at the ATS Unit.
Part 3 Specific Requirements
6 Recording of Data obtained "Through The Wall" (TTW)
6.1 Surveillance data provided to, or obtained by, an ATS Unit for the purposes of providing an air traffic service shall be recorded "through the wall", i.e. data obtained from remote or on site sensors or networks with the exception of data obtained from older, analogue primary radar sensors and surface movement surveillance systems.
7 Requirements for the Recording and Retention of Data by Third Party Providers
7.1 In circumstances where secondary surveillance data is sourced from a third party (e.g. NATS or MoD), ATS Units are reminded that they must obtain and submit to the relevant CAA Regional Office evidence that the surveillance data used to support the provision of ATS will be recorded (and retained for a period in excess of 30 days) by the provider of such data.
NOTE: This evidence should be in the form of a written agreement between the provider of the surveillance data and the ATS Unit.
8 Requirements to Enable and Support the Reconstruction of Aircraft Flight Paths
8.1 The AAIB, CAA or other investigating agency may need to reconstruct an aircraft flight path from surveillance data recorded and retained by the ATS Unit or third party provider.
8.2 Investigation and subsequent analysis of aircraft accidents is often assisted by data supplied in the form of the latitude and longitude of each target plus time relative to UTC and any additional data obtained from secondary replies.
8.3 This data cannot easily be derived from screen recordings so recordings of the original data returned from the surveillance sensor (or sensors) must also be retained by the ATS Unit or a third party provider, if the ATS Unit was using surveillance data derived from an external source.
9 Exemption for Analogue Primary Radar and Surface Movement Surveillance Systems
9.1 Analogue Primary Radar Systems
9.1.1 Data from an analogue (non plot extracted) primary radar sensor presents an impractical recording requirement as regards bandwidth and subsequent storage of the recorded data.
9.1.2 The users of analogue radar systems will therefore be permitted to record surveillance data captured at the display position using screen shots recorded "at the glass" (ATG), as described in Section 10 of this document.
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CAP 670 Air Traffic Services Safety Requirements 2(97)
