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NOTE: It is unlikely that the ATS Unit will be able to provide sufficient data for the AAIB, or other investigating agency, to reconstruct the flight path of an individual aircraft based solely on analogue primary radar data unless that Unit was receiving secondary surveillance data (as an overlay to the analogue radar data) from a third party such as NATS or the MoD, and the source data was being recorded (and retained) by the provider of that data.
9.2 Surface Movement Surveillance Systems
9.2.1 The requirements for recording surface movement surveillance data will be limited to those situations where tactical control decisions are based upon the information obtained from those systems, and in those situations, the recording and retention of screen shots will be deemed sufficient to meet CAA and ICAO requirements.
NOTE: The reconstruction of aircraft flight paths is unlikely to be required from recordings of aerodrome surface movement surveillance systems.
10 Recording of Screen Shots "At The Glass" (ATG)
10.1 Surveillance data used as an aid to air traffic services shall be recorded from a connection (or "tap"), as close to each operational display as is practicable.
10.2 Data obtained from this second recording point shall comprise a series of "screen shots" of each operational display.
10.3 Screen shots shall be recorded with no loss of accuracy or detail at a rate equal to the source of the surveillance data in the case of ADS and multi-lateration systems or a rate not less than twice the maximum rotation rate of any radar sensor(s) if these are employed to provide the surveillance data being displayed.
11 Accurate and Consistent Timing
11.1 The surveillance recording system shall include time-recording devices or techniques to ensure the accurate "time-stamping" of ATS data.
11.2 Time-recording devices or techniques shall use Co-ordinated Universal Time (UTC) and shall express each time-stamp in hours, minutes and seconds of the 24-hour day beginning at midnight (712).
11.3 A common time-source shall be used to ensure that all recordings made at an ATS Unit or those retained by a third party provider can be time-synchronised in accordance with the minimum requirements set out in paragraph 5.10 of this document.
11.4 The recorder time-source shall be automatically updated by reference to an international time standard such as the MSF signal radiated from Anthorn in Cumbria or be subject to regular and documented checks to ensure that the time-stamps are maintained within a tolerance of less than ± 2 seconds of UTC (713).
12 Data Integrity and Continuity of Recording
12.1 It is likely that the provision of dual-redundant equipment or systems which contain multiple hard disc drives (HDD) or solid state drives (SSD), configured as Redundant Array of Independent Drives (RAID) will be necessary to achieve the required availability.
12.2 The provision of a back-up power supply from either a central battery system or individual Un-interruptible Power Supply (UPS) unit shall ensure the continued availability of power to the surveillance recording system and other essential equipment in the event of an interruption to the main electrical supply (2261).
12.3 Guidance: The equipment configuration should take account of such factors as the hours of operation of the ATS Unit, and any provisions for maintenance/repair at the ATS Unit, including the ability to replay recorded data, and when needed, the ability to copy such data to removable media whilst continuing to record surveillance data.
13 Alarm/Status Indications
13.1 Local and remote alarm/status indications of the surveillance recording system, including any additional hardware associated with "screen capture" (ATG), shall be provided to alert Air Traffic Control and/or Engineering personnel to take such actions as are necessary to ensure the continued operation of the surveillance recording at the ATS Unit (985).
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CAP 670 Air Traffic Services Safety Requirements 2(98)
