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According to EASA AIR OPS, a Category III B operations, is a precision instrument approach and landing using ILS or MLS with, a decision height lower than 50 ft, or no decision height and a runway visual range lower than 200 m but no less than:
  • A
    75 m
  • B
    50 m
  • C
    125 m
  • D
    200 m

EASA AIR OPS
Annex I Definitions for terms used in Annexes II to VIII

(13) ‘category I (CAT I) approach operation’ means a precision instrument approach and landing using an instrument landing system (ILS), microwave landing system (MLS), GLS (ground-based augmented global navigation satellite system (GNSS/GBAS) landing system), precision approach radar (PAR) or GNSS using a satellite-based augmentation system (SBAS) with a decision height (DH) not lower than 200 ft and with a runway visual range (RVR) not less than 550 m for aeroplanes and 500 m for helicopters;

(14) ‘category II (CAT II) operation’ means a precision instrument approach and landing operation using ILS or MLS with:

(a) DH below 200 ft but not lower than 100 ft; and

(b) RVR of not less than 300 m;

(15) ‘category IIIA (CAT IIIA) operation’ means a precision instrument approach and landing operation using ILS or MLS with:

(a) DH lower than 100 ft; and

(b) RVR not less than 200 m;

(16) ‘category IIIB (CAT IIIB) operation’ means a precision instrument approach and landing operation using ILS or MLS with:

(a) DH lower than 100 ft, or no DH; and
(b) RVR lower than 200 m but not less than 75 m;
Category Decision Height (DH) Runway Visual Range
CAT I 200 ft or higher 550 m
CAT II < 200 ft but not lower than 100 ft 300 m
CAT IIIA < 100 ft 200 m
CAT IIIB No DH 75 m (ICAO SARPS – 50 m)

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