IRVRInstrument Runway Visual Range
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Meteorological equipment: IRVR Transmission meters, AMOs/RAMOS/SAMOS/FAMOS
He explained that IRVR measuring equipment uses assumed values for the brightness of each light, as a component in calculating the current visibility, therefore regularly ascertaining the performance of each light could lead to a 'credit'-a higher assumed value-being used in the equipment's calculation.