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7.5.2.2 Acceptable Means of Compliance: The manufacturer's stated lifetime for the archive media together with media usage data from the logbook may be used as an indicator for replacement. Other means may include tape usage data stored on the media itself or data held within the recording equipment.
7.5.2.3 Guidance: Any precautions stated by the manufacturer or supplier of the recording equipment concerning the handling / storage of the archive media are very important in ensuring the integrity of recorded data and achieving the stated lifetimes for the media.
7.6  Impounding of Recordings
7.6.1  On receiving a detailed request concerning recorded transmissions from either the CAA SRG Transcription Unit or the AAIB, normally within the 30 day retention period, archived data containing the specific recorded transmissions shall be removed from normal storage or extracted from HDD/SDD and placed in a separate and secure quarantine area pending further instructions (999).
7.6.2  Extracts of recorded communications, copied from the original source files contained on HDD/SSD or from a separate archive source to removable media must be demonstrated to be a complete, accurate and verifiable copy of the original recordings (2265).
NOTE:  Manufacturers of ATS recording and replay systems are now able to offer software tools which are capable of meeting this requirement and the ATS provider is encouraged to check whether the CAA will accept the production of "copies on demand" from their particular systems
7.6.3  In the event of an aircraft accident or serious incident, ATS units are permitted to make one single copy from the original media before the original recording is placed into separate and secure storage (2360). An archive copy will be made from internal storage devices before a local copy is made (2361). Subsequent local replays of the recorded transmissions must only be made from the local copy (2362).
7.6.4  Guidance: Original recordings may be impounded for a minimum period of three years in the case of accident investigations.
7.7  CAA SRG Access to Recording Equipment
7.7.1  Access to the Recording Equipment shall be permitted to authorised persons from the CAA SRG Transcription Unit, for the purposes of replaying and making copies of original recordings (1733).
7.7.2  Acceptable Means of Compliance: If the recording equipment is unable to replay removable archive media whilst continuing to record communications, another recorder or dedicated replay-only equipment may be required.
7.8  Prevention of Inadvertent Loss of Recorded Communications
7.8.1  The inadvertent loss of recorded communications, whilst operating the recording equipment, shall be prevented by means of procedures in conjunction with equipment security functions where available (1734).
COM 01 Appendix -Minimum Performance Specification for Recording Equipment
1  Scope
This document comprises the minimum performance specification for analogue and digital recording equipment used at Air Traffic Control Units for the recording of voice and data link communications.
2  General
2.1  Equipment Configuration
2.1.1  The equipment shall be designed with appropriate options to ensure the uninterrupted availability of communications recording (1045).
NOTE:  Options might include the duplication of critical internal units such as electronics modules, power supply units, intermediate and archival storage media drives and the ability to interconnect main and standby recording equipment.
2.1.2  Where an option to interconnect main and standby equipment is available, an automatic changeover function shall be provided, which operates the main and standby equipment in parallel to ensure continuity of recordings, for an adjustable time period with a recommended minimum of 10 minutes (1046).
2.2  Alarm / Status Indications
　
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