Aviation Glossary Definitions - Category List

CAT

CAT IIIc – Category IIIc – Approach

A precision instrument approach and landing with no decision height and no runway visual range limitations. (ICAO – IS&RP Annex 6).

CAT IIIb – Category IIIb – Approach

A precision instrument approach and landing with a decision height lower than 15m (50 ft), or no decision height and a runway visual range less than 200m (700 ft) but not less than 50m (150 ft). (ICAO – IS&RP Annex 6). FAA Note – the United States does not use Decision Heights for Category IIIb

CAT IIIa – Category IIIa – Approach

A precision instrument approach and landing with a decision height lower than 30m (100 ft), or no decision height and a runway visual range not less than 200m (700 ft). (ICAO – IS&RP Annex 6).

CAT II – Category II – Approach

A precision instrument approach and landing with a decision height lower than 60m (200 ft) but not lower than 30m (100 ft) and a runway visual range not less than 350m (1200 ft). (ICAO – IS&RP Annex 6).

CAT I – Category I – Approach

A precision instrument approach and landing with a decision height not lower than 60m (200 ft) and with either a visibility not less than 800m (2400 ft), or a runway visual range not less than 550m (1800 ft). (ICAO – IS&RP Annex 6).

Aviation Glossary Definitions - Category List

CAT

CAT IIIc – Category IIIc – Approach

CAT IIIb – Category IIIb – Approach

CAT IIIa – Category IIIa – Approach

CAT II – Category II – Approach

CAT I – Category I – Approach

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