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13.2 Remote alarm indications shall be "latching" so that they require positive intervention by ATC or Engineering staff and confirmation of the status of the surveillance recording system by those staff before the alarms are cancelled.
13.3 Guidance: Whilst it may be appropriate to able to cancel an audible alarm, another independent visual signal or lamp should continue to alert ATC or Engineering staff until the necessary restorative action has been taken by these staff.
14 Serviceability and Recording Function Check
14.1 A daily check shall be made of the surveillance recording function.
14.2 Guidance: Use can be made of any devices or facilities incorporated into the recording equipment to perform automatic checks of the recording function but unless this check is made directly from the hard drive (or drives), a separate replay of pre-recorded data must be made (as determined by local procedures) and the result recorded in the Engineering log book.
15 Surveillance Data Storage Procedures
15.1 The recorded data shall be retained in secure storage and protected from being erased, corrupted or deleted for a period of at least thirty days.
NOTE: When the recordings are pertinent to accident and incident investigations, they shall be retained for longer periods until it is evident that they are no longer required (see Section 16).
15.2 Suitable measures and procedures at each ATS Unit shall ensure: a) All access to the stored data is recorded (728); b) Authority under which any recorded radar data leaves the site for replay or
duplication is recorded (729); and c) The identity of the person or organisation taking charge of the recorded radar data is recorded (730).
16 Impounding the Recorded Data
16.1 In accordance with the existing requirements published in COM 01 of CAP 670, the ATS Unit, or third party provider of surveillance data, will be permitted to retain one copy of the quarantined data for local use but data retained in the "quarantine" area of the ATS recorder must not be replayed, deleted or over-written until CAA written permission for the release of such data is received (725).
17 Access to Original Records
17.1 The ANSP shall ensure that appropriate requirements and guidance for ATS personnel are contained in their Manual of Air Traffic Services Part 2.
18 Replay Functions and Facilities
18.1 The use of replay and duplication functions provided by the surveillance recording system shall not cause a break in the recording (742).
18.2 ATS Units and third party providers are reminded of the need to provide, when required by either the Air Accident Investigation Board (AAIB) or the CAA, a copy of the aircraft tracks.
NOTE: In most cases this data is provided as a spreadsheet formatted as .xml files or similar.
18.3 The surveillance replay system shall also be capable of producing hard copy of the recorded aircraft tracks and this data shall be made available to either the AAIB or the CAA when required (743).
19 Replay of Surveillance Data Recorded "at the glass" (ATG)
19.1 Replay of the extracted and reconstructed data from screen shots shall faithfully and correctly identify all of the features displayed at the relevant operational position at the time of screen capture.
19.2 The recorded data should be available for replay at a separate (non-operational) position either "on-demand", or as soon as possible, in the case of a replay required to support "search and rescue".
19.3 Data extracted from recordings made using screen capture techniques shall be capable of being exported to, and being replayed by, either the CAA or AAIB using standard media player software.
19.4 Individual frames/shots, from a replayed sequence of screen shots, should also be capable of being output as a printed copy when required.
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CAP 670 Air Traffic Services Safety Requirements 2(99)
