Category IIIB operation
From EUROCONTROL ATM Lexicon
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Abbreviation
CAT IIIB
Definition
A precision instrument approach and landing with:
a) a decision height lower than 15 m (50 ft) or no decision height; and
b) a runway visual range less than 175 m but not less than 50 m.
Definition Source
ICAO, Official definition:
ANNEX 6/I Operation of Aircraft — International Commercial Air Transport — Aeroplanes 2010
ANNEX 6/II Operation of Aircraft — International General Aviation — Aeroplanes 1998
ANNEX 6/III Operation of Aircraft — International Operations — Helicopters 2010