Originally Posted by
KingAir1978
Secondly, when the VIS drops below 800 m YOU HAVE TO BE PROVIDED with RVR information.
ICAO :
4.6.3 Runway visual range
Note: Guidance on the subject of runway visual range is contained in the ICAO Manual of Runway Visual Range Observing and Reporting Practices (Doc 9328).
4.6.3.1 Runway visual range as defined in 1 above shall be assessed
on all runways intended for Category II and III instrument approach and landing operations.
4.6.3.2 [Recommendation] Runway visual range as defined in 1 above should be assessed on all runways intended for use during periods of reduced visibility, including:
(a) Precision approach runways intended for Category I instrument approach and landing operations; and
(b) Runways used for take-off and having high-intensity edge lights and/or centre line lights.
Note: Precision approach runways are defined in ICAO Annex 14, Volume I, Chapter 1, under “Instrument runway”.
4.6.3.3 The runway visual range, assessed in accordance with 4.6.3.1 and 4.6.3.2 above, s
hall be reported in metres throughout periods when either the visibility or the runway visual range is less than 1 500 m.
4.6.3.4 Runway visual range assessments shall be representative of:
(a) The touchdown zone of the runway intended for non-precision or Category I instrument approach and landing operations; 19
(b) The touchdown zone and the mid-point of the runway intended for Category II instrument approach and landing operations; and
(c) The touchdown zone, the mid-point and stop-end of the runway intended for Category III instrument approach and landing operations.