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Instrumented Runway Visual Range Forward Scatter Meter

Aeronautical & General Instruments (AGI) Ltd Instrumented Runway Visual Range - FSI - Field - Site


Runway Visual Range (RVR) is defined as the distance over which the pilot of an aircraft on the centreline of a runway can see the runway surface markings or the lights delineating the runway or identifying its centre line. Because it is not possible to measure RVR directly, instrumented RVR (IRVR) systems are used to provide an assessment of RVR to be used in determining airport operating conditions.


AGIVIS FSM is a forward scatter-based Runway Visual Range (RVR) system that provides accurate and flexible capabilities for less than the cost of transmissometer-based equipment.

The first generation of AGI RVR systems were developed in co-operation with the UK Met Office and CAA, and AGI has been supplying RVR systems for more than 25 years.  AGIVIS FSM systems are currently operational at major international airports certified for instrument landings up to and including CAT III.

AGIVIS FSM is fully compliant with ICAO, WMO and CAA requirements. The system consists of sensor field sites, background luminance meters, runway lighting interfaces, data processing equipment and archive storage and backup. It can drive multiple full-colour dedicated RVR displays. It generates present weather and meteorological visibility data in addition to RVR.

Systems can be supplied fully installed with comprehensive engineering and operator training, and post-installation support is available worldwide.


  • Forward scatter visibility sensor
  • Rugged field proven sensor design
  • Low maintenance high reliability system design


Instrumented Runway Visual Range System

AGIVIS CAT III Forward Scatter Meter – Technical Description

AGIVIS CAT III Forward Scatter Meter - Technical Description

Instrumented Runway Visual Range System

AGIVIS FSM – The Case For Forward Scatter – White Paper

White Paper - The Case for Forward Scatter Sensors for IRVR


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