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6.2  All interfaces between the IRVR system and other systems shall be designed, constructed, installed and tested to an integrity standard appropriate for the more demanding applicable standard (1758).
6.3  The interfaces to the lighting systems shall be fed with tell-back information only (1653).
6.4  Any tell-back indications from the runway lighting system which indicate that the lighting equipment has malfunctioned or which prevent the status of the runway lighting from being established shall render the IRVR information to be invalid (1759).
6.5  The IRVR system shall be provided with a time source which shall be synchronised to UTC within a tolerance of ± 5 seconds (1655).
7  Monitoring
7.1  All IRVR systems shall be self-monitoring for correct operation(1656).
7.2  Any incorrect operation identified by the monitoring shall render the IRVR information to be invalid (1760)
7.3  Displays in operational positions shall indicate the serviceability status of the system. (1761).
8  Displays
8.1  Displays shall present the RVR data in the manner described below:
a) In an alphanumeric format with indication of trend over successive readings (1658);
b) Any changes in system status, including blanking of displayed data, or RVR value, shall be presented at operational displays within 15 seconds of the change (1762).
8.2  Where the IRVR value is presented on a display system that is not dedicated to the function (i.e. where information from a variety of sources is displayed on a single display system), all operational ATC positions shall display the IRVR data in the standard alphanumeric format (1763).
8.3  All displays shall be provided with a method of testing the serviceability of the display and backed by procedures to ensure compliance with the stated criticality (1661).
8.4  Where data is transmitted beyond the aerodrome the ICAO station identification shall be included (1664).
8.5  The data shall be displayed with the following resolution: a) 25 metre intervals from 50 to 400 metres (1665). b) 50 metre intervals from 400 to 800 metres (1666). c) 100 metre intervals above 800 metres (1764).
9  Recording
9.1  IRVR records shall be time stamped against UTC and retained for a minimum period of 30 days (1668). Electronic, magnetic or optical recording devices may be used, but all records must be stored in a readily accessible format. Printed copies of these records shall be available on request (1765).
9.2  The RVR value and status information shall be recorded in the event of the following: a) Change in RVR or trend from any site (1669). b) System self test (1670). c) On detection of change of serviceability status (including nature of the fault) (1671). d) Change of runway in use (1672). e) Change in runway lighting intensity (1673).
9.3  Recommendation: Change in law used to calculate the given RVR value should be recorded (1674).
9.4  Recommendation: Transmittance, Illuminance Threshold (Et) and software version should be recorded (1675).
9.5  Recommendation: Runway light intensity used for IRVR computation should be the actual light intensity in use on the runway and RVR should not be computed for a light intensity of 3 per cent or less of the maximum light intensity available (2308).
10  Siting Criteria
10.1  Safety objective
Sensor measurements shall be used to derive an RVR value that is representative of the pilot’s perspective of the visibility along the runway(1766).
10.2  The location of IRVR sensors shall be agreed by the CAA (1767).
10.3  Recommendation: IRVR sensors should be positioned not more than 120 metres laterally from the runway centreline, but not infringing the obstacle-free zone for precision approach runways. In the touch-down zone (TDZ), sensors should be sited not more than 300 metres from the threshold in the landing direction (1768).
　
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本文鏈接地址：CAP 670 Air Traffic Services Safety Requirements 2(64)