GM1
MET.TR.210(c)(3)
Observing meteorological elements
RUNWAY VISUAL RANGE (RVR) — USE OF
INSTRUMENTED SYSTEMS
(a) Since accuracy can vary from one
instrument design to another, performance characteristics are to be checked
before selecting an instrument for assessing the runway visual range.
(b) The calibration of a forward-scatter meter
has to be traceable and verifiable to a transmissometer standard, whose
accuracy has been verified over the intended operational range.
(c) Guidance on the use of transmissometers
and forward-scatter meters in instrumented Runway Visual Range systems is
given in ICAO Doc 9328 'Manual of Runway Visual Range Observing and
Reporting Practices'.
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