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6.2.1.1 It is likely that the provision of main and standby equipment or systems, which contain multiple hard disc drives (HDD) or solid state drives (SSD) configured as a Redundant Array of Independent Drives (RAID), will be necessary to achieve the required availability.
6.2.1.2 The provision of a backup power supply from either a central battery system or individual UPS units shall ensure the availability of power to the recording equipment and other essential equipment in the event of a mains interruption (2261).
6.2.1.3 Guidance: The equipment configuration should take into account such factors as the hours of operation of the ATS unit, provision for maintenance/repair, ability to replay recorded archival media whilst continuing to record, exchange of media.
6.2.1.4 The incorporation of suitable mains conditioning devices as part of the mains / backup power supply arrangements may be useful in preventing equipment malfunction due to surges, spikes and noise on the power supply.
6.2.2 Where the equipment and power supply configuration is such that the availability of recording, without interruption, cannot be ensured whilst an Air Traffic Service is being provided, either the provision of the Air Traffic Service shall cease within a time period defined in the Local Instructions for the Air Traffic Control Unit or a written record shall be kept in accordance with Article 206 paragraph (4)(c) of the Air Navigation Order (983).
6.2.3 A practical demonstration of the capability to undertake the requirements of Article 206 paragraph (4)(c) shall be given to the satisfaction of the CAA before this option will be permitted as an alternative to the provision of additional equipment and power supplies to ensure continuity of recording (984).
NOTE: In the event of a complete failure of the recording equipment, it is generally not practical for a written record to be kept of the particulars and summary of each communication in compliance with Article 206 paragraph (4)(c) of the Air Navigation Order and hence additional equipment and power supplies are normally provided to cater for this event.
6.3 Alarm / Status Indications
6.3.1 The local and remote alarm / status indications of the recording equipment shall be used as appropriate to alert Air Traffic Control and Engineering personnel to take the necessary actions to ensure the continued operation of the equipment (985).
6.3.2 The remote alarm / status indications shall be 'latching' such that they require positive intervention to check that the recording equipment is operating correctly before any alarm can be cancelled (986).
6.3.2.1 Guidance: Whilst it may be appropriate to be able to cancel an audible alarm, another indication such as a visual alarm should still remain until the alarm condition has been resolved.
6.4 Working Facilities
6.4.1 Working facilities shall be provided to enable authorised persons to operate the equipment and undertake other duties such as replay and copying, maintenance, repair and inspection (987).
6.4.1.1 Guidance: Facilities may include provision of lighting and mains electrical power in the vicinity of the recording equipment or control console, together with suitable seating and writing surface. Easily accessible connections to the recording equipment may be provided where copies of recordings are required to be made.
6.5 Disposal of Recording Equipment
6.5.1 Before the disposal of any Recording Equipment, the CAA SRG Transcription Unit shall be consulted to determine whether there is a need to retain the equipment as a replay facility for any impounded recordings (988).
6.5.1.1 Guidance: Any original recordings that have been impounded for accident/legal reasons may be required to be re-played for some considerable time after the accident/incident and advice should be sought from the CAA Transcription Unit before disposal.
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CAP 670 Air Traffic Services Safety Requirements 1(101)
